AN AUTOMATIC MILKING APPARATUS

Abstract: An automatic milking apparatus comprises a milking equipment having at least one teatcup (11), a robot arm (8) for attaching a teatcup to an animal's teat, an animal identification means (5, 6) for allowing identification of an animal individual, and an animal space (1) provided with an animal accepting/rejecting means (2) associated with a control means. A method of controlling the automatic milking apparatus is also described. According to the invention, said control means is programmed to allow an animal substantially in the beginning of its lactation period to be milked more often than in a later stage thereof.

Description: An automatic milking apparatus TECHNICAL FIELD OF THE INVENTION The present invention relates to an automatic milking apparatus comprising a milking equipment having at least one teatcup, a robot arm for attaching a teatcup to an animal's teat, an animal identification means for allowing identification of an animal individual, and an animal space provided with an animal accepting/rejecting means associated with a control means. The present invention also relates to a method of controlling said automatic milking apparatus. An apparatus and a method of this king is known from EP-A-0 551 957. The known apparatus suffers from the drawback that animals are given priority to be milked over other animals, that may need to be milked. Animals that live in herds, such as cows, have a strict hierarchy over one another. Accordingly, in case a group of cows are standing close to the automatic milking machine, e.g. at the entrance gate of a milking stall, and two of them happen to be identified more or less simultaneously by an identification means arranged close to the entrance gate, the cow of higher rank in the hierarchy would normally enter the milking stall before the cow of lower rank. However, in the apparatus according to EP-A-0 551 957, the control means gives priority between animals, which means that in case two cows of different rank are identified substantially simultaneously, the cow of lower rank may be allowed to enter the milking stall before the cow of higher rank. This may cause a crowd of jostling and jamming cows at the entrance of the milking stall, which in turn causes inefficient use of the automatic milking apparatus. SUMMARY OF THE INVENTION It is accordingly the object of the present invention to overcome the problem of the known apparatus. This problem has been solved by an apparatus of the initially defined kind, which is characterised in that said control means is programmed to allow an animal substantially in the beginning of its lactation period to be milked more often than in a later stage thereof. It has also been solved by a method of the initially defined kind, which is characterised by allowing, by means of said control means, an animal substantially in the beginning of its lactation period to be milked more often than in a later stage thereof. Thus, the animal is solely compared to its own milking data, so that in case two animals that are allowed to be milked are identified substantially simultaneously, the animal of the higher rank in the herd will not be hindered to be milked before the animal of the lower rank. Suitably, said control means is switchable between at least two stages of the lactation period, a first stage starting at the beginning of the lactation period, a last stage ending towards the end of the lactation period. Hereby, it is possible to set a predetermined number of milkings for each stage. Preferably, at least one animal individual is allowed a certain number of milkings per day at at least one stage of the lactation period, and another certain number of milkings per day at at least one other stage of the lactation period. Hereby, it is possible to control the number of milkings regarding each animal individual. Suitably, said lactation period is divided into stages having a length of at least one day, which means that the length may be at least one week or at least one month. Of course, the stages need not have the same length. On the contrary, the length of one stage may be different from the length of another stage. Accordingly, one period may have the length of a number of days, another period of a number of weeks, and yet another period of a number of months. This is due to the curve of the lactation period. Preferably, the length of said stages is automatically set based on reference values. Hereby, it is possible to let the apparatus work completely autonomously. Suitably, the length of said stages is set manually. Hereby, it is possible to set the length of the stages for each animal individual. Preferably, the length of each stage for the whole lactation period is set before the beginning of the first stage. Hereby, it is possible to set the length of the stages for a typical breed of animals. Suitably, the length of said stage is adaptable during the lactation period. Hereby, it is possible to adapt the length of a stage, during the lactation period, for each animal individual. Preferably, the length of said stages is determined by measurement of the amount of extracted milk from an animal during a at least one milking, a threshold value of the amount determining the end of said stage. Hereby, it possible to automatically change from one stage to another. Suitably, the length of said stages is predetermined for at least a part of a herd. Hereby, it is possible to set the stages outgoing from different parameters of the herd, even if they are all e.g. in the beginning of the lactation period. Such a parameter may be the normal milk yield for a part of the herd - another part of the herd may have another normal milk yield. Another parameter may be the size of the udder. Preferably, the allowed number of milkings per day increases in the beginning of the lactation period towards a maximum point. Furthermore, the allowed number of milkings per day decreases from said maximum point towards the end of the lactation period. The said decrease of allowed number of milkings per day is substantially continuous. Hereby, the number of milkings will be adapted to a normal curve of the lactation period. Suitably, the allowed number of milkings per day for an animal individual is not less than 1 milking per day and no more than 6 milkings per day. Hereby, the con- trol means is given limits so that an animal individual is not forgotten to be milked or is milked too much, in which case the dairy maid should be alarmed by a suitable signal. Preferably, said control means is programmed to allow said animal to be milked only after a minimum time interval from a previous milking. Hereby is prevented that an animal individual is milked the allowed number of milkings per day in a row, i.e. during a short period of time, which would result in that after the allowed number of milkings, that animal individual would not be milked again until the next day, which in turn could be very painful for the animal. Suitably, said accepting/rejecting member is a gate allowing or preventing access to said animal space. Preferably, said gate is adapted in a first position to accept access of said animal into said animal space, but to prevent access into a waiting area, and in a second position to accept access of said animal into a waiting area but to prevent access into said animal space. Hereby, the gate will select animals that are allowed to be milked from animals that are not allowed to be milked. Suitably, an animal allowed to be milked and is standing at a first distance from said sensor, is given priority to enter said milking space in relation to an animal allowed to be milked and standing at a second distance from said sensor, said second distance being larger than said first distance. Hereby, as an animal of higher rank in the hierarchy will normally force itself to enter a rmlking stall before an animal of a lower rank, the animal of higher rank will be allowed to enter the milking stall, as it will then be standing closer to the milking stall. DRAWING SUMMARY The invention will now be described more closely with reference to the accompa- nying drawings, in which Figure 1 is schematic presentation of a top view of a milking stall Figure 2 illustrates the milking stall shown in figure 1, including a selection stall. Figure 3 illustrates the milking stall shown in figure 2, leading from a first residing area to a second residing area. Figure 4 illustrates the milking stall shown in figure 2, leading to a return lane. Figures 5a to 5d are diagrams of lactation periods. DETAILED DESCRIPTION OF THE INVENTION Figure 1 shows a an animal space 1, in the form of a milking stall, defined by an entrance gate 2, an exit gate 3 and railings 4. Each cow is provided with a collar mounted transponder 5, which interacts with a transponder reader 6 arranged at the entrance of the stall 1, when a cow is in the vicinity thereof. The cow will then be identified, and it will be established in a control means (not shown) associated with the entrance gate 2, whether the cow should be allowed to enter the stall 1 or not. Accordingly, the stall gate 2 constitutes a cow accepting/rejecting means. A milking robot 7 comprising a robot arm 8 with a gripper 9 and a teatcup rack 10 with teatcups 11 are provided for allowing attachment of a teacup 11 onto each teat of the animal to be milked. The teat location and teatcup attachment is performed in a known manner and is not part of the invention. In figure 2, a selection stall 12 is associated with the milking stall 1 in such a way that only one cow at a time will be allowed to be identified by the transponder reader 6. A cow that is not allowed to enter the stall, will instead be let into a residing area 13 where it came from, when entering the selection stall 12. The residing area 13 is defined by a fence or a wall 14. In figure 3, the selection stall 12 instead leads into a second residing area 15, in which cows that are not allowed to be milked for a while are to reside. Also the exit gate 3 of the milking stall 1 leads to that area. The first and second residing areas 13, 15 are defined by a wall or fence 14 and by a further wall or fence 16, dividing said areas. The wall or fence 16 is provided with a gate 17 associated with a further transponder reader 18, such that cows that should be allowed to be milked in a near future may enter the first residing area 13 for achieving access to the milking stall 1. Figure 4 illustrates a further possibility of arranging the milking stall of figure 2 in a stall. Cows that have been milked, as well as cows that are not allowed to be milked, enter the second area 15. The second area 15 is connected to the first resid- ing area by a corridor 20, which is long enough to delay newly milked cows and other cows that are not allowed to be milked in their attempts to try to enter the milking stall again. Figure 5 a is a diagram showing a typical curve of a lactation period of a cow, the diagram having an X-axis regarding the lactation time (months) and a Y-axis regarding the recommended number of milkings per day. Of course, the curves will look differently for other milking animals, such as sheep, goats, buffaloes and horses. For such animals, it will of course be possible to create suitable curves. Figure 5b shows a lactation period divided into five stages I, II, III, TV and V. The different stages of the lactation period may be used for a whole herd of a mixture of breeds, a whole herd of the same breed, a part of a herd or for a cow individual. In case the curve is not representative for a particular breed, a particular herd, a particular part of a herd or a particular cow individual, another standard curve may be used, such as the ones showed in figures 5c and 5d, respectively. It should however be noted that the curves shown in figures 5a to 5d are only examples of standard curves. Such standard curves may be supplied by the milking robot supplier for a particular breed. Alternatively, a typical lactation curve may be manually set in the control means of the milking robot, for a particular breed or a particular animal. The curves may be stored in the control means, either as a continuous curve or as a stepped function. Alternatively or additionally, the number of stages may be manually set for a herd, a part of the herd or for a particular animal. Furthermore, the start of the lactation period is entered into the control means, pref- erably by the dairy maid, when the cow has calved. In case it turns out that a selected standard curve allows the cow to be milked too often or too seldom, the dairy maid may then either exchange the standard curve, or manually change the number of milkings per day, or manually change the duration of the stage or stages. In order to perform the change of stages or numbers of rmlkings automatically, the amount of extracted milk may be used as basis therefor. Accordingly, in case the extracted amount of milk is above a predetermined limit, the control means allows the cow individual to be milked e.g. one time per day. However, in case the extracted amount of milk is under a predetermined limit, the control means allows that cow individual to be milked e.g. one less occasion per day. Likewise, the extracted amount of milk may be used as a threshold value for determination of the end of a stage.

Claims: CLAIMS 1. An automatic milking apparatus comprising a milking equipment having at least one teatcup (11), a robot arm (8) for attaching a teatcup to an animal's teat, an animal identification means (5, 6) for allowing identification of an animal individual, and an animal space (1) provided with an animal accepting/rejecting means (2) associated with a control means, characterised in that said control means is programmed to allow an animal substantially in the beginning of its lactation period to be milked more often than in a later stage thereof. 0 2. An apparatus according to claim 1, wherein said control means is switchable between at least two stages of the lactation period, a first stage starting at the beginning of the lactation period, a last stage ending towards the end of the lactation period. 5 3. An apparatus according to claim 1 or 2, wherein at least one animal individual is allowed a certain number of milkings per day at at least one stage of the lactation period, and another certain number of milkings per day at at least one other stage of the lactation period. ,0 4. An apparatus according to claim 2 or 3, wherein said lactation period is divided into stages having a length of at least one day. 5. An apparatus according to anyone of claims 2 to 4, wherein said lactation period 5 is divided into stages having a length of at least one week 6. An apparatus according to anyone of claims 2 to 5, wherein said lactation period is divided into stages having a length of at least one month. 0 7. An apparatus according to anyone of claims 2 to 6. wherein the length of one stage mav be different from the lensrth of another stasje. 8. An apparatus according to anyone of claims 2 to 7, wherein the length of said stages is automatically set based on reference values. 9. An apparatus according to anyone of claims 2 to 7, wherein the length of said stages is set manually. 10. An apparatus according to anyone of claims 2 to 9, wherein the length of each stage for the whole lactation period is set before the beginning of the first stage. 11. An apparatus according to anyone of claims 2 to 10, wherein the length of said stage is adaptable during the lactation period. 12. An apparatus according to anyone of claims 2 to 11, wherein said the length of said stages is determined by measurement of the amount of extracted milk from an animal during a at least one milking, a threshold value of the amount determining the end of said stage. 13. An apparatus according to anyone of the preceding claims, wherein the length of said stages is predetermined for at least a part of a herd. 14. An apparatus according to anyone of the preceding claims, wherein the allowed number of milkings per day increases in the beginning of the lactation period towards a maximum point. 15. An apparatus according to claim 14, wherein the allowed number of milkings per day decreases from said maximum point towards the end of the lactation period. 16. An apparatus according to claim 15. wherein the said decrease of allowed num- ber of milkings per day is substantially continuos. 17. An apparatus according to anyone of the preceding claims, wherein the allowed number of milkings per day for an animal individual is not less than 1 milking per day and no more than 6 milkings per day. 5 18. An apparatus according to anyone of the preceding claims, wherein said control means is programmed to allow said animal to be milked only after a minimum time interval from a previous milking. 0 19. An apparatus according to anyone of the preceding claims, wherein said accepting/rejecting member (2) is a gate allowing or preventing access to said animal space. 20. An apparatus according to claim 19, wherein said gate (2) is adapted in a first 15 position to accept access of said animal into said animal space (1), but to prevent access into a waiting area (15), and in a second position to accept access of said animal into a waiting area (15) but to prevent access into said animal space (1). 21. An apparatus according to claim 19 or 20, wherein an animal allowed to be -0 milked and is standing at a first distance from said sensor, is given priority to enter said animal (1) space in relation to an animal allowed to be milked and standing at a second distance from said sensor, said second distance being larger than said first distance. 5 22. A method of controlling aβ automatic milking apparatus, which comprises a milking equipment having at least one teatcup (11), a robot arm (8) for attaching a teatcup to an animal's teat, an animal identification means (5, 6) for allowing identification of an animal individual, and an animal space (1) provided with an animal accepting/rejecting means (2) associated with a control means, characterised by 30 allowing, by means of said control means, an animal substantially in the beginning of its lactation period to be milked more often than in a later stage thereof. 23. A method according to claim 22, including switching, by means of said control means, between at least two stages of the lactation period, a first stage starting at the beginning of the lactation period, a last stage ending towards the end of the lactation period. 24. A method according to claim 22 or 23, including allowing at least one animal individual a certain number of milkings per day at at least one stage of the lactation period, and another certain number of milkings per day at at least one other stage of the lactation period. 25. A method according to claim 23 or 24, including dividing said lactation period is divided into stages having a length of at least one day. 26. A method according to anyone of claims 23 to 25, including dividing said lactation period into stages having a length of at least one week 27. A method according to anyone of claims 23 to 26, including dividing said lactation period into stages having a length of at least one month. 28. A method according to anyone of claims 23 to 27, including setting the length of one stage differently from the length of another stage. 29. A method according to anyone of claims 23 to 28, including automatically setting the length of said stages is automatically set based on reference values. 30. A method according to anyone of claims 23 to 28. including manually setting the length of said stages. 31. A method according to anyone of claims 23 to 30, including setting the length of each stage for the whole lactation period before the beginning of the first stage. 32. A method according to anyone of claims 23 to 31, including adapting the length of said stage during the lactation period. 33. A method according to anyone of claims 23 to 32, including determining the length of said stages by measurement of the amount of extracted milk from an ani- mal during a at least one milking, a threshold value of the amount detemiining the end of said stage. 34. A method according to anyone of the claims 22 to 33, including setting a predetermined length of said stages for at least a part of a herd. 35. A method according to anyone of claims 22 to 34, including increasing the allowed number of milkings per day in the beginning of the lactation period towards a maximum point. 36. A method according to claim 35, including decreasing the allowed number of milkings per day from said maximum point towards the end of the lactation period. 37. A method according to claim 36, including decreasing the allowed number of milkings per day substantially continuously. 38. A method according to anyone of the claims 22 to 37, including allowing the number of milkings per day for an animal individual to be not less than 1 milking per day and no more than 6 milkings per day. 39. A method according to anyone of claims 22 to 38, including allowing said animal to be milked only after a minimum time interval from a previous milk g. 40. A method according to anyone of claims 22 to 39, including allowing or preventing access to said animal space by means of said accepting rejecting member, said accepting/rejecting member being a gate. 41. A method according to claim 40, including - accepting access of said animal into said animal space (1) when said gate (2) is in a first position, but to preventing access into a waiting area (15), and - accepting access of said animal into a waiting area (15) when said gate (2) is in a second position, but to prevent access into said animal space (1). 42. An apparatus according to claim 40 or 41, including giving priority to an animal allowed to enter said milking space (1) and is standing at a first distance from said sensor (6), in relation to an animal, which is allowed to be milked and is standing at a second distance from said sensor, said second distance being larger than said first distance.

Inventors: BIRK UZI, BIRK, UZI
Applicants: ALFA LAVAL AGRI AB, BIRK UZI, BIRK, UZI
Application year: 1998
Main classification: A01J5
IPC codes: A01J5