Method for elimination of D-vitamin deficiency of fatting bulls in stress conditions of industrial complex
Authors: Yarovan N.I. , Ryzhkova G.F. , Maksimovsky V.A. , Sergachev A.A. 
Published: March 2022

The development of stress-induced disorders in fattening bulls under industrial technology exacerbates vitamin and mineral deficiency. Effective and environmentally friendly to increase the level of missing vitamins are preparations of natural origin. One of them is melange, which includes egg white and yolk. The creation of melange is due to more convenient storage and transportation in comparison with whole eggs. The melange contains a large amount of protein, polyunsaturated fatty acids, as well as a vitamin-mineral complex, its characteristic feature is the stability of biologically active properties during freezing or melting. The energy value of melange is 157.00 kilocalories per 100 g of the product, which are made up of calories obtained from proteins - 12.70 g, fats - 11.50 g and carbohydrates - 0.70 g. The content of vitamin D3 in melange was studied. The studies were carried out at OOO IL Test-Pushchino on a Shimadzu LCMS-8060 liquid chromatography-mass spectrometer. A high content of vitamin D3 in melange was found, equal to 3617 µg/kg. The object of research were bulls of black-and-white breed aged from 6 to 12 months. The experiment was carried out on two groups of animals, 15 heads each. All bulls received the same basic diet. The calves of group I were the control and received only the main diet, the bulls of the experimental group received, in addition to the main feed ration, a composition representing a mixture of the following composition: egg powder (at a dose of 100 g) per head; urea (at a dose of 15 g) per head and Miarom P (at a dose of 20 g) per head by mixing with the feed mixture for 30 days. A positive dynamics of vitamin D3 was established when using the proposed composition: from the initial values equal to 20.05 ?g/kg, the vitamin content reaches 50 ?g per kg by the 30th day of the experiment.Starting from the 10th day of the experiment, the calcium content reaches 2.57 mmol/L and by the end of the experiment it is 2.64 mmol/L, which tends to the middle of the reference values (2.06-3.16).A similar trend is observed in the dynamics of the phosphorus content in the blood of bulls, already from the 10th day the phosphorus concentration approaches the highest limit of the reference values (1.13-2.91 mmol/L) and is equal to 2.80 mmol/L, and by the 30th day reaches 2.81 mmol / L. Throughout the experiment, the increase in live weight of bulls of both groups (experimental and control) was determined, the results showed that the bulls that were fed most intensively grew using the "Method of increasing the average daily gain of bulls aged 6 months and over" (patent No. 2751221), according to which bulls in addition to the main diet received egg powder at a dose of 100 g per head; urea at a dose of 15 g per head and Miarom P at a dose of 20 g per head by mixing with the feed mixture for 30 days. The weight of bulls in the experimental group after 30 days of feeding was higher by an average of 6 kg (163.0 kg versus 157.0 kg in the control). At the same time, an increase in average daily gains in bulls by 11% was found, which allows us to recommend the use of the proposed composition for bulls with D-vitamin deficiency.