Abstract:
To cover the energy needs of animals, in particular domestic animals, including ruminants, relatively large quantities of fat can be fed in a completely absorbable form without disturbing the animals&#39; digestive processes. The fats are chosen from readily available sources such as lard, tallow, fish oils, and the like, and preferably have the following spectrum of fatty acids: 
     
       ______________________________________ 
     
        C 4  -C 12          3-5%   C 14          1-2%   C 16          20-25%   C 16-1          1-3%   C 18          20-30%   C 18-1          35-50%   C 18-2          0-1%   C 20          1-2%______________________________________ 
     If a selected fat has a melting point below the body temperature of the animal to be fed, the fat is hydrogenated to raise its melting point above the body temperature of the animal and is converted preferably by means of a cold-air crystallization process, into a structure of fine particles of a maximum size of 50 μm. The resulting fat particles can be fed alone, or in feed rations of any kind, with further additives such as mixtures of vitamins and minerals, protein concentrates and starch, but without emulsifiers.

Description:
This application is a continuation of application Ser. No. 545,187, filed Oct. 25, 1983, now abandoned, and a continuation-in-part of applicant&#39;s copending U.S. patent application, Ser. No. 467,231, filed Feb. 17, 1983, now abandoned, which is a continuation of application Ser. No. 247,865, filed Mar. 26, 1981 now abandoned. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a method of supplying the energy needs to animals, particularly to domestic animals including ruminants, and the feeds to be used for this method. 
     2. Description of the Prior Art 
     It is well known that to cover the energy demands of ruminants and other domestic animals, fat can be used in limited quantities only. Furthermore, the common types of fats, whose melting point lies below that of the body temperature of the animal, can only be fed with the ration in quantities of a maximum of 5%, otherwise the animal&#39;s digestive process is considerably disturbed. Another way of feeding fat is in the form of emulsions containing fat particles measuring 10 to 50μm, (Swiss Patentschrift No. 456 010; Lang &amp; Uzzan, &#34;Les Corps Gras en Poudre: Preparation, Proprietes, Utilisations&#34;, Corps Gras en Poudre, No. 6, June 1975, pages 327 to 335). Likewise, however, this form of fat supply also causes disorders of the digestive process--in the omasum and especially in the rumen--if considerable quantities are fed. 
     It is general knowledge that fats which melt at high temperatures, i.e., above about 50° C., suffer in digestibility at a progressively greater rate as the melting point is increased. This has been confirmed by A. Rosenberg in his U.S. Pat. No. 3,011,0892. In order to overcome this difficulty, Rosenberg has suggested the use of fat mixtures of very specific composition including one or more liquid oils that have not been hydrogenated. fat is said to have good digestibility with chicks when fed flakes which may be up to 2 mm in thickness and up to 5 mm in diameter. It was held that the size of such particles is not critical. 
     SUMMARY OF INVENTION 
     The purpose of the present invention is to offer the possibility of feeding fats in large quantities, i.e., in excess of about 5%, in a form which does not cause disorders of the digestive process even of ruminants, and which can nevertheless be completely resorbed. 
     With this method, for example, the much-feared ketosis in dairy cattle during the period of lactation, as well as its after-effects, such as, for example, fertility disorders and low persistence, can be avoided by providing the possibility of a supply energy in conformity with milk production. The solution, by the invention, consists of feeding to the animals fats in powdered or particulate form, wherein the fats have a melting point above the body temperature of the animals and have a particle size measuring 50μm at most. The fats are fed in dry form without any addition of emulsifiers. With this method, it has been found on the one hand, that the above-mentioned disadvantages of fats which cover the food particles with a film of fat in the digestive tract of the animal can be avoided, and on the other hand, that complete resorption of the fats is effected because of the small size of the particles. In particular, the fat particles in the omasum remain unchanged, thus forming neither an emulsion nor a film of fat; they are digested and resorbed in the small intestine. Thus, fat portions exceeding 5% can be added and fed in the ration; rations containing as much as 23% fat having been tested on dairy cows without any drawbacks and with high resorption of the fat. Thus, the method of this invention is contrary to all theories stating that ruminants are unable to digest and support fat in such high quantity. 
     To prepare the fat particles or high fat feeds of the present invention virtually any animal or vegetable fat or mixture of such fats may be used, so long as the selected fat has a melting point above the body temperature of the animals to be fed, provided that such low-melting fat or oil is first hydrogenated by methods well known in the art to raise the melting point of the fat or oil above the body temperature of the animals to be fed. Thus, the present invention not only provides novel means for the energy needs of animals, but at the same time provides a novel and highly economic way of using surplus fat. In most industrialized countries with high meat consumption, large quantities of surplus fat are produced for which no proper use and recycling has been known. For hygienic reasons very small quantities of such fats are used for human nourishment, and for the reasons set out above, use of such fats for animal feeding was not believed to be suitable. This invention now shows the way for economic use of such surplus products for animal feeding, particularly for feeding dairy cows and beef cattle or the like. The high economy of this invention not only results from the possibility of recycling surplus fat, but since the energy needs of the animals may now largely be covered with cheap fat, expensive feeds, particularly cereals, may be substituted for by fat to a substantial degree. 
    
    
     DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a graph comparing the milk yield versus the week of lactation of cows fed with a fat-free ration (Group A) and cows fed with a high fat ration in accordance with the invention (Group B); 
     FIG. 2 is a graph comparing the lactose content in the milk produced versus the week of lactation of cows fed with a fat-free ration (Group A) and cows fed with a high fat ration in accordance with the invention Group B); 
     FIG. 3 is a graph comparing the blood glucose level versus the week of lactation of cows fed with a fat-free ration (Group A) and cows fed with a high fat ration in accordance with the invention (Group B); and 
     FIG. 4 is a graph comparing the milk protein content versus the week of lactation of cows fed with a fat-free ration (Group A) and cows fed with a high fat ration in accordance with the invention (Group B). 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The method of obtaining the fat powder according to this invention and examples of this feed will first be described. 
     As set out above, any available fat or oil or mixture thereof may be used. In most industrialized countries animal fats such as lard, tallow, fish oils and the like are available in high quantities. Such fats are removed from the tissue of slaughtered animals, for example, by hot vapors or by solvent extraction techniques which are well known in the art and which are not per se part of the present invention. 
     The fats, because of their broad ranging sources, may exhibit widely varying melting points. However, only those fats exhibiting a melting point above the body temperature of the animals to be fed are suitable for preparing the powdered fat according to the invention. Accordingly, any fats or oils of low melting point are hydrogenated in a manner well known in the art to raise the melting point of the fat or oil above the body temperature of the animals to be fed. Normally, the fats having a melting point below about 45° C. are hydrogenated to raise their melting point to about 45° C. or higher. The upper limit of the melting point of the fat is not particularly critical and fats having a melting point of 70° C. or more are satisfactory. However, since it becomes increasingly more expensive to raise the melting point of low melting fats or oils to a very high melting point and since it is essential only to raise the melting point enough such that the melting point is above the body temperature of the animals to be fed, the low melting fats or oils generally are hydro-generated only to the extent necessary to raise their melting point to about 45° C.-70° C.; 
     As indicated above, non-hydrogenated fats of high natural melting point, such as beef fat, may be used without hydrogenating. However, in some cases it may be desirable or at least convenient to hydrogenate even relatively high melting point fats. For example, when the fats to be used are derived from a mixture of low melting fats or oils and relatively higher melting fats, it is often more convenient to hydrogenate the whole mixture than to separate the fats on the basis of their melting points and to then hydrogenate only those fats or oils having a melting point below the body temperature of the animals to be fed. This would in no way effect the utility of the resultant hydrogenated mixture so long as all of the fat components in the hydrogenated mixture melt above the body temperature of the animals to be fed and so long as the particles of the resulting hydrogenated fat powder are below about 50 μm in size. 
     All steps of separating the fats from the tissues, hydro-genating and treating them otherwise are well known in the art and are not per se a part of this invention. They are extensively described, for example, in &#34;Gewinnung und Verarbeitung von Nahrungsfetten&#34; by J. Baltes, published by P. Parey, Berlin, Hamburg, 1975. 
     Fats obtained and hydrogenated as set out above generally have the following spectrum of fatty acids: 
     
         ______________________________________   C.sub.4 -C.sub.12         3-5%   C.sub.14         1-2%   C.sub.16         20-25%   C.sub.16-1         1-3%   C.sub.18         20-30%   C.sub.18-1         35-50%   C.sub.18-2         0-1%   C.sub.20         1-2%______________________________________ 
    
     These fats have a iodine value in the order of 35 to 45. 
     Vegetable fats are prepared similarly. Since vegetable fats differ from animal fats in the composition of fatty acids and also appreciably differ amongst each other, such fats differ from the above spectrum of fatty acids and iodine value, but this is without any negative consequences from a technical or physiological point of view, provided such fats are fed in strict accordance with the conditions of this invention. 
     The fats obtained as set out above and mixed in any desired quantities are melted and are then treated by a cold-air spray-crystallization process. Methods and apparatus for producing fat powder having-a particle size below 50 μm are well the art and are not per se a part of this invention. A method and apparatus of this type is described in Swiss patent 456,010. The fat powder of particles having a size below 50 μm may be used as such as an animal feed or food supplement or it may be blended with other components to form a premixed or concentrated feed or ration, the powdered fat may be used in any amount as desired. However, amounts of at least about 5% should be used to take advantage of the unique characteristics of the fat powder of this invention and amounts of up to about 25% or more of the ration are suitable. 
     For ease of handling, it is often desirable to form fat concentrates by mixing the fat powder with a carrier which is inert relative to the fat such as powdered calcium carbonate, titanium dioxide, aluminum oxide, or preferably, a starch such as cornstarch, wheat starch or the like. The carrier or mixture or carriers may be added to the fat particles in widely varying amounts, with amounts of carrier ranging from about 5% to about being acceptable. Preferably, the amount of carrier would range from about 5% to about 15% by weight. The carrier may be added to the fat particles while the fat particles are suspended in a near vacuum in a hot state. As is the case for the powdered fat having no carrier, the powdered fat concentrate containing, for example, 10% carrier and 90% fat, may be used as a single component feed or as one component of a combination feed or ration, the portion of fat in the ration may be up to about 25%. 
     The following high fat feeds or rations may be prepared and used with excellent success: 
     
         ______________________________________I) Mixture with relatively small energy density______________________________________fat concentrate according to the                 10 parts by weightinvention (90% hydrogenated lard-10% cornstarch)cereal starch         12 parts by weightmaize (corn)          33 parts by weightwheat                 12 parts by weightsoya bean meal, extracted                 14 parts by weightmaize gluten          12 parts by weightmineral-vitamin-concentrate                  7 parts by weight______________________________________ 
    
     The portion of pure fat in this feed is on the order of 9%. The energy contents of 1 kg of this mixture is on the order of 8.2 MJ/NEL or 9.0 MJ/NEW. (MJ=Megajoule, NEL=net energy lactation, NEW=net energy growth.) The mineral-vitamin concentrate is of the type conventionally employed in annual rations and includes minerals such as calcium, phosphorus, sodium, magnesium, iron, zinc, manganese, copper, cobalt, iodine and the like. Similarly, the vitamins included in the concentrate are conventional ration adjuncts consistent with animal nutrition. 
     
         ______________________________________fat concentrate according to the                 23 parts by weightinvention (90% hydrogenated lard-10% cornstarch)soya bean meal, extracted                 68 parts by weightvitamin-mineral-concentrate                  9 parts by weight______________________________________ 
    
     The portion of pure fat in this mixture is on the order The energy contents of 1 kg is on the order of 10.0 or 10.9 MJ/NEW. 
     According to the quality and quantity of basic feed available, any intermediate portion of fat concentrate according to this invention may be added to the ration. 
     Mixtures of concentrated feeds which have been energetically improved by the addition of fat concentrate according to this invention exhibit energy densities never achieved in the past. Accordingly, animals can be fed as little as 2/3 their normal ration of concentrated feed without any loss of production. Stated differently, the uniquely high energy densities of rations containing the fat particles in accordance with this invention allow savings of up to 1/3 of the usual quantities of concentrated feed without any loss in productivity of the animals. This is not only of high economic importance in view of a reduction of expenses for the feed, but also in view of the world-wide deficiency of cereals. 
     This invention will now further be illustrated by the following examples. 
     EXAMPLE 1 
     In this example, a group of cows in their first lactation were fed a ration with and without a fat concentrate according to this invention. Beginning in the third week of the lactation period tests were made to ascertain the digestibility of the rations. The cows were fed individually and the test groups (twelve cows each) were selected in accordance with milk quantity, milk composition and weight of the cows during the first and second week of the lactation period. The duration of test was 8 and the test conditions were changed after 4 weeks. The cows were fed with hay ad libitum and concentrated feed of a composition A and B as stated below. The quantities of concentrated feeds were as follows in three rations per day: 
     
         ______________________________________2 weeks prior to calve    2 kg1st and 2nd week of lactation                     4 kg3rd to 10th week of lactation                     5 kg(with more than 25 kg of milk                     6 kg)______________________________________ 
    
     The composition of the concentrated feed was as follows for the two test groups A and B: 
     
         ______________________________________              GROUP A GROUP B              %       %______________________________________barley (crushed)     40        40maize (corn)         30        17soya bean meal, extracted                27.1      30.1fat according invention (hydrogenated                --        10lard)salt                 0.4       0.4calcium carbonate    1.5       1.5Premix               0.7       0.7Cr.sub.2 O.sub.3     0.3       0.3calculated nutritive value per kg                7.0       8.5dry matter MJ/NELcrude protein g      181       181______________________________________ 
    
     The digestibility of these rations was examined by the indicator method with the following digesting coefficients: 
     
         ______________________________________         GROUP A GROUP B______________________________________organic substance           69.8      69.7protein         58.9      60.4fat             66.6      83.6crude fibre     66.7      68.7ash             45.7      43.4______________________________________ 
    
     These digestion analyses show that the addition of fat according to this invention (in Group B) had no influence on the digestibility of the organic substances and protein, the being substantially the same in both groups. It is seen that for the most important parameter, namely the digestion of crude fiber, a somewhat better digestion has been observed in Group B, this proving that the fat concentrate according to this invention does not cause the well known digestive depression occurring if fat is added to the feed in a usual form. The digestibility of fat according to this invention is even clearly higher. 
     The absence of any negative effect on the digestibility the essential nutritive components indicates that the fat either is not hydrolyzed or hydrolyzed in very small proportion only in the rumen. This confirms the theory according to which the hydrogenated fat is protected in the rumen in manner similar to the so-called protected fat, where the fat droplets are enveloped in a coating of protein (U.S. Pat. No. 3,925,560). The cross-linkage of the protein molecules prevents the protein coating from being attacked in the rumen, whereby digestion can take place in the rest of the digestive tract. A similar effect is believed to be by the high melting point in a substantially simpler and cheaper way by this invention, whereby it is assumed that the very small size of less than 50 um of the fat particles is important for assuring high digestibility of the fat in the digestive tract following the rumen. 
     EXAMPLE 2 
     Based on the positive test results obtained in Example 1 using fat in a quantity of 10%, further experiments were made higher additions of fat. These experiments were made with dairy cows in two groups A and B of nine cows each selected in with the age, milk production and weight. The cows were habituated to the test ration 3 weeks prior to calving. The following rations of concentrated feed were administered until the 9th week of lactation: 
     
         ______________________________________            GROUP A GROUP B            %       %______________________________________fat concentrate according to              --        23invention (hydrogenated lard)soya bean meal, extracted              34        68.4barley             40.7      --maize (corn)       20        --calcium carbonate  3.3       4salt               1         1.6Premix *           1         1calcium phosphate  --        2calculated nutritive value              7.5       10.5per kg dry matter MJ/NELcalcium protein (gr.)              235       315______________________________________ * containing the minerals magnesia, manganese, copper, zinc, cobalt, iodine, selenium and the vitamins A, D.sub.3, E and cereal middlings as carrier. 
    
     The basic feed for both groups was used until the 9th week of lactation: 
     
         ______________________________________maize silage     6.6 MJ NEL/kghay              5.2 MJ NEL/kgThe feeds wereoffered as follows:End of the dry period:            maize silage ad libitum            hay          6 kg            concentrated feed according to            above tables            A: up to 3 kg            B: up to 2 kg1st to 9th week of lactation:            basic fodder as above            concentrated feed according to            above tables            A: up to 7.5 kg            B: up to 5 kg______________________________________ 
    
     With these rations the animals in both groups A and B obtained the same quantities of energy (MJ NEL) and crude protein (gr). 
     The following parameters were tested: 
     
         ______________________________________milk productionconsumption of basic foddercomposition:       lactose content              fatty acids of the milk fat              protein content              glucose______________________________________ 
    
     The milk quantity in both groups was substantially the same in spite of the reduced administration of concentrated feed in group B. (see Table 1 and FIG. 1) 
     
                                           TABLE 1__________________________________________________________________________Milk Yield (kg) - During Numbered Week of Lactation (LW)AnimalNumberGroup    1LW       2LW          3LW 4LW                 5LW 6LW                        7LW 8LW                               9LW__________________________________________________________________________ 1   A   153.0       217.8          213.0              204.9                 204.7                     213.2                        218.8                            211.6                               209.9 2   A   180.5       216.1          232.2              232.0                 219.5                     208.3                        215.7                            207.0                               199.9 3   A   225.9       248.7          259.0              262.2                 255.2                     240.5                        227.6                            225.3                               227.4 4   A    74.5       222.5          239.4              249.8                 261.9                     261.0                        252.1                            253.4                               267.9 5   A   129.1       194.0          193.3              183.0                 178.7                     173.9                        170.0                            166.9                               157.7 6   A   134.6       250.1          262.5              290.6                 277.2                     281.5                        274.6                            268.7                               263.2 7   A   148.0       208.3          220.4              205.9                 207.0                     202.0                        199.7                            199.0                               195.9 8   A   166.2       204.9          237.9              230.0                 252.6                     260.1                        252.0                            249.9                               232.7 9   A   169.5       174.3          205.3              191.0                 230.7                     232.9                        211.6                            206.1                               202.610   B   146.9       206.0          195.9              216.6                 223.3                     228.9                        225.6                            203.7                               199.811   B   152.0       201.5          203.3              216.0                 219.9                     201.6                        222.1                            219.1                               205.012   B   113.0       212.5          234.2              241.5                 235.4                     245.7                        242.2                            245.7                               243.113   B   173.2       239.8          248.8              243.8                 242.7                     227.5                        204.1                            209.8                               201.414   B   177.0       210.2          223.3              230.5                 236.2                     232.1                        225.6                            214.9                               214.215   B   114.0       206.4          215.2              223.6                 226.6                     210.3                        216.4                            208.7                               206.416   B   176.4       208.4          224.0              232.9                 254.9                     261.4                        246.7                            259.9                               260.017   B    77.6       184.3          204.5              210.6                 217.4                     215.4                        209.5                            204.7                               197.418   B    81.8       218.1          219.7              239.2                 239.3                     245.1                        247.8                            231.0                               215.4__________________________________________________________________________ 
    
     No substantial difference between groups A and B was observed regarding the lactose content. (see Table 2, FIG. 1) 
     
                                           TABLE 2__________________________________________________________________________Lactose Content of Milk (%) -During Numbered Week of Lactation (LW)AnimalNumberGroup    1LW       2LW          3LW 4LW                 5LW 6LW                        7LW 8LW                               9LW__________________________________________________________________________ 1   A   3.9       5.3          5.3 5.4                 5.1 5.1                        5.2 5.1                               5.1 2   A   4.2       4.5          4.5 4.7                 4.3 4.7                        4.4 4.8                               4.4 3   A   4.9       5.3          5.3 5.2                 5.2 5.5                        5.0 5.3                               5.3 4   A   4.9       4.9          5.2 5.4                 5.2 5.3                        5.1 5.3                               5.2 5   A   4.5       5.1          5.1 5.1                 5.1 4.9                        5.2 5.0                               5.1 6   A   -- 4.8          5.0 4.9                 5.2 4.9                        5.1 5.1                               5.0 7   A   4.0       4.9          5.0 5.0                 4.9 5.1                        5.0 4.9                               5.0 8   A   4.3       4.6          4.9 4.8                 4.8 4.9                        5.0 5.0                               4.8 9   A   5.0       4.8          5.1 5.2                 5.3 5.7                        5.3 5.1                               5.110   B   4.0       5.1          5.3 5.0                 5.1 5.2                        5.2 4.9                               5.111   B   5.0       5.2          5.1 5.1                 5.0 5.1                        5.2 5.1                               5.312   B   -- 4.9          5.3 5.2                 5.5 5.1                        5.4 5.2                               5.113   B   3.8       4.7          4.7 5.1                 4.7 4.7                        4.5 4.5                               4.714   B   4.6       5.1          5.1 5.2                 5.2 5.3                        5.2 5.1                               5.315   B   -- 4.7          5.3 5.3                 5.4 5.1                        5.3 5.1                               5.116   B   4.9       5.4          5.4 5.3                 5.1 5.3                        5.2 5.2                               5.117   B   5.0       5.1          5.2 5.3                 5.2 5.0                        5.0 5.1                               4.918   B   5.1       5.4          5.1 5.0                 5.1 5.1                        5.0 5.1                               5.1__________________________________________________________________________ 
    
     The spectrum of fatty acids in the milk fat of groups A and B was observed. In the milk of group B the fatty acids of short or middle structure were reduced by about 10%, but the proportion of unsaturated fatty acids C 18-1  and C 18-2 , particularly of the oleic acid C 18-1 , was increased by about 11%. This would result in a butter made of the milk of group B of sorter consistency. (see Tables 3 and 4) 
     
                       TABLE 3______________________________________Fatty Acids in the Milk Fat of Group A (%) -During Number Week of Lactation (LW)Fatty Acids*    1LW    2LW    3LW  4LW  5LW  6LW  7LW  9LW______________________________________C 4:0    2.8    3.0    3.0  3.0  2.9  2.9  2.6  2.7C 6.0    1.8    1.0    2.2  2.3  2.2  2.2  2.1  2.1C 8:0    1.1    1.2    1.4  1.5  1.4  1.5  1.4  1.4C 10:0   2.6    2.6    2.6  3.4  3.3  3.4  3.5  3.5C 11:0   0.1    0.2    0.2  0.3  0.3  0.3  0.3  0.3C 12:0   3.2    2.9    3.4  3.9  3.8  3.9  4.1  4.1C 14:br  0.1    0.1    0.2  0.1  0.2  0.1  0.2  0.2C 14:0   11.8   10.0   11.0 11.9 12.3 12.5 12.9 13.0C 14:1/C15    1.2    1.1    1.3  1.4  1.6  1.6  1.7  1.8C 15:1   0.8    0.9    1.0  1.1  1.2  1.2  1.4  1.3C 16:br  0.3    0.3    0.3  0.3  0.4  0.4  0.4  0.4C 16:0   33.3   28.8   30.2 31.7 32.8 33.9 35.1 34.8C 16:1   3.0    2.8    2.8  2.6  2.6  2.5  2.5  2.4C 17:0   0.9    1.0    0.9  0.9  0.9  0.9  0.9  0.9C 17:1   0.5    0.5    0.5  0.4  0.4  0.4  0.4  0.4C 18:0   9.9    12.4   10.3 9.6  8.9  8.4  8.1  8.2C 18:1   22.2   26.2   24.3 22.0 21.3 20.3 19.3 19.0C 18:2   2.4    2.5    2.6  2.4  2.3  2.3  2.2  2.2C 18:3   1.5    1.5    1.4  1.4  1.3  1.3  1.3  1.3C 20:0   0.2    0.1    0.2  0.2  0.1  0.1  0.1  0.1______________________________________ *The fatty acids are shown as containing a given number of carbon atoms and double bonds. The number of carbon atoms is stated after &#34;C&#34; and the number of double bonds is stated after &#34;:&#34;. The &#34;br&#34; following &#34;:&#34; for C1 and C16 indicates that the fatty acids are branched. 
    
     
                       TABLE 4______________________________________Fatty Acids in the Milk Fat of Group B (%) -During Number Week of Lactation (LW)Fatty Acids    1LW    2LW    3LW  4LW  5LW  6LW  7LW  9LW______________________________________C 4:0    2.5    2.9    2.7  2.7  2.4  2.3  2.2  2.1C 6:0    1.5    1.8    1.5  1.5  1.4  1.4  1.3  1.2C 8:0    0.9    1.0    0.8  0.8  0.8  0.7  0.7  0.7C 10:0   1.7    1.8    1.5  1.5  1.5  1.5  1.5  1.4C 11:0   0.1    0.1    0.1  0.2  0.2  0.2  0.2  0.2C 12:0   2.2    2.0    1.7  1.8  1.8  1.8  1.5  1.7C 14:br  0.2    0.1    0.1  0.1  0.1  0.1  0.1  0.1C 14:0   9.1    8.1    7.4  7.5  7.7  7.8  7.9  7.7C 14:1/C15    0.9    0.9    1.0  1.1  1.2  1.2  1.3  1.4C 15:1   0.8    0.8    0.8  0.7  0.8  0.8  0.8  0.8C 16:br  0.2    0.3    0.3  0.3  0.3  0.3  0.3  0.3C 16:0   29.5   27.1   27.5 27.8 28.4 28.1 28.6 27.9C 16:1   2.8    2.7    2.9  2.9  3.0  3.0  3.1  3.2C 17:0   0.9    0.9    0.8  0.8  0.8  0.8  0.8  0.7C 17:1   0.5    0.5    0.4  0.4  0.4  0.4  0.4  0.4C 18:0   13.0   13.8   13.4 13.3 11.6 11.4 11.0 10.3C 18:1   28.8   32.0   32.9 33.5 33.6 34.2 33.6 35.0C 18:2   2.3    1.9    2.0  1.9  1.9  1.9  1.9  1.8C 18:3   1.9    2.0    2.0  2.1  2.1  2.1  2.2  2.5C 20:0   0.1    0.1    0.2  0.2  0.1  0.2  0.2  0.2______________________________________ *The fatty acids are shown as in Table 3. 
    
     The glucose values in the blood of the cows of group A decreased more rapidly than those of Group B, thus showing that the cows of group B were energetically better supplied. It may be assumed that this efficiently reduces the danger of acetonemy (ketosis). (see Table 5, FIG. 3) The milk protein content shows no significant difference (see Table 6, FIG. 4) 
     
                                           TABLE 5__________________________________________________________________________Glucose in Blood mg/100 ml - During Numbered Week of Lactation (LW)    -2 Weeks          -1 WeekAnimal   Before          BeforeNumberGroup    Calving          Calving                1LW                   2LW                      3LW                         4LW                            5LW                               6LW                                  7LW                                     9LW__________________________________________________________________________ 1   A   73.9  73.9  61.5                   54.1                      65.3                         60.7                            63.5                               54.4                                  64.1                                     61.9 2   A   64.7  62.4  59.5                   58.7                      45.2                         51.9                            49.2                               63.4                                  64.3                                     57.5 3   A   66.1  69.1  -- 41.7                      45.8                         53.9                            51.8                               57.4                                  53.6                                     64.8 4   A   --    --    52.3                   53.5                      56.1                         58.8                            59.1                               55.0                                  60.5                                     58.5 5   A   67.2  65.8  62.0                   50.9                      61.1                         57.5                            54.8                               51.6                                  61.8                                     51.1 6   A   70.2  62.8  46.7                   40.8                      35.9                         45.1                            44.2                               50.4                                  54.5                                     54.4 7   A   66.9  65.1  52.7                   46.3                      52.3                         55.6                            56.6                               58.9                                  56.8                                     57.4 8   A   65.5  68.3  42.8                   51.7                      53.3                         51.8                            55.6                               45.7                                  52.1                                     59.8 9   A   63.4  68.3  59.8                   51.4                      43.7                         63.0                            58.2                               64.9                                  61.5                                     67.210   B   67.7  69.4  56.3                   62.6                      50.0                         54.7                            60.0                               58.7                                  68.9                                     62.011   B   61.1  60.1  59.1                   56.2                      53.6                         54.0                            60.4                               61.6                                  68.2                                     62.012   B   78.2  64.9  53.4                   56.3                      54.0                         54.1                            62.9                               52.5                                  58.0                                     57.913   B   64.8  60.3  57.5                   55.8                      59.3                         59.9                            61.2                               62.4                                  62.5                                     63.914   B   64.2  62.3  62.1                   54.5                      68.3                         61.7                            56.9                               58.0                                  66.6                                     61.015   B   72.0  72.8  46.0                   43.8                      39.2                         48.9                            56.8                               50.0                                  60.6                                     60.216   B   59.6  --    64.9                   52.2                      44.1                         50.7                            54.8                               58.9                                  50.4                                     56.117   B   58.5  59.7  50.4                   58.7                      51.6                         48.2                            47.9                               53.9                                  52.5                                     52.218   B   69.9  69.1  60.6                   49.9                      65.8                         57.7                            62.9                               70.8                                  62.2                                     68.1__________________________________________________________________________ 
    
     
                                           TABLE 6__________________________________________________________________________Milk Protein Content (%) -During Numbered Week of Lactation (LW)AnimalNumberGroup    1LW       2LW          3LW 4LW                 5LW 6LW                        7LW 8LW                               9LW__________________________________________________________________________ 1   A   3.6       3.5          3.1 3.2                 3.2 3.1                        3.2 3.1                               3.3 2   A   3.9       3.4          3.1 3.2                 2.9 2.7                        3.0 3.0                               3.0 3   A   3.9       3.4          3.5 3.1                 3.1 3.2                        3.2 3.3                               3.3 4   A   -- 3.8          3.6 3.1                 3.1 3.2                        3.1 2.9                               2.9 5   A   4.0       4.2          3.1 3.7                 3.7 3.7                        3.4 3.6                               3.5 6   A   3.7       3.5          3.3 2.9                 3.0 2.8                        2.9 2.8                               2.9 7   A   5.8       3.8          3.4 3.3                 3.9 3.3                        3.3 3.2                               3.3 8   A   4.2       3.7          3.1 3.1                 2.9 2.9                        3.1 2.9                               3.1 9   A   4.3       3.3          3.6 2.8                 3.2 3.3                        3.2 3.3                               3.310   B   6.9       4.0          3.5 3.1                 3.2 3.1                        3.2 3.3                               3.211   B   3.8       3.5          3.1 3.0                 2.8 2.9                        2.8 3.0                               3.112   B   3.9       3.8          3.3 3.1                 3.1 3.0                        3.0 3.0                               2.913   B   4.5       3.3          3.1 3.1                 3.0 3.1                        3.1 3.1                               3.314   B   4.2       3.3          2.9 2.9                 3.1 3.1                        2.9 3.0                               3.015   B   4.0       3.8          3.2 2.9                 2.9 2.9                        2.8 2.9                               2.816   B   4.3       3.5          3.2 2.9                 3.0 3.0                        3.1 3.0                               3.017   B   4.0       3.9          3.3 3.2                 3.2 3.0                        3.0 2.9                               2.918   B   4.1       4.0          3.4 3.1                 3.1 3.1                        3.0 3.1                               3.4__________________________________________________________________________ 
    
     The following Table 7 shows the consumption of basic fodder. It is seen that the animals of group B consumed about 4.2 kg per day more than the animals in group A, thus showing that due to the reduced quantity of concentrated feed the animals consume higher quantities of the cheap fodder offered ad libitum. Thereby feeding becomes much more economic. The difference is also of importance from the point of view of nutrition physiology because the increased consumption of basic fodder is in agreement with the needs of ruminants (higher proportion of structurized crude fiber), whereby proper functions of the rumen are ensured. 
     
                                           TABLE 7__________________________________________________________________________Consumption of maize silage per dayWeek ofLactation1  2  3  4  5  6   7  8   9  Average__________________________________________________________________________Group A18.5   19.5      21.0         21.5            22.5               23.5                   24.0                      25.0                          25.0                             22.3kg/dayGroup B20.0   24.0      25.0         28.0            28.5               28.5                   28.0                      28.0                          28.0                             26.5kg/day__________________________________________________________________________ 
    
     Further experiments were made for testing the feeding according to this invention for the fattening of beef. Results were quite positive. In many cases it was found advisable to use more grass silage than maize silage for the following reasons. In climatic boundary zones the yield of meadows is more reliable than the yield of maize. Heavy soils do not support monocultures of maize for years without the soil structure being destroyed, this resulting in steadily decreasing yield. With meadows in the rotation of crops it is possible to maintain and regenerate the soil structure. It is of particular interest to use areas located on a slope for beef fattening. However, since grass silage is rich in protein but poor in energy, high quantities of cereal have to be used for equilibration of the feed. However, this has a negative influence on the rumen activity where the low pH-value results in inactivation of the cellulases. 
     Under these circumstances, it is more promising to use fat having no detrimental effect in the rumen. Due to the energy density obtained with the fat used in accordance with this invention in a concentrated feed, the amount of feed to be used may even be reduced substantially. The economic consequences are very favorable as illustrated by the following Table 8: 
     
                       TABLE 8______________________________________                   conventional                   feed with fat        conventional                   added according        concentrated feed                   to invention______________________________________energy per kg of feed          7.4 MJ NEW   9 MJ NEWconcentratetest period    Jan. 8 to    March 13 to          March 13, 1981                       June 11, 1981number of animals          63           67weight of animals            206 kg       204 kggrowth per animal and day          1.205 kg     1.167 kgconcentrate ration per day          2.920 kg     1.788 kgconcentrate per kg          2.628 kg     1.582 kgof growthcost of feed per kg of          2.33 Swiss frs.                       1.43 Swiss frs.growth______________________________________ 
    
     The highly economic interest of the feeding method of this invention is clearly demonstrated. Besides the reduction of the quantity of concentrated feed ration by over 40% and the reduction of expenses by nearly 40%, surplus products may be used instead of cereals which should be preserved for human needs. Experiments have shown that the quality of the meat of the animals fattened with a concentrate containing fat according to invention was excellent as illustrated by the following Table 9: 
     
                       TABLE 9______________________________________           Maximum   Average markCriterion       marks     of the group______________________________________1. general suitability           10        9.72. age          10        103. meatiness    10        8.64. consistency   5         55. adiposity    10        106. quality of fat            5         5______________________________________ 
    
     Where the maximum mark was not reached, this was ascribed to the genetic qualities of the animals and not to the feed. A economy is achieved in this case due to the low cost for concentrated feed and the high price for the meat having quality. 
     It is to be understood that the above examples and the above-described illustrative embodiments in no way limit the scope of this invention and are intended merely as illustrations of the manner in which the present invention may be practiced. It should be obvious to one skilled in the art that the present invention is in no way limited to the exampled high fat feed rations and that numerous modifications within the spirit and scope of this invention are contemplated.