Complete feeding makes it possible to fully use the genetic potential of animals, increase productivity and reduce feed consumption. In order to balance diets in terms of protein, it is advisable to use synthetic nitrogenous substances in feeding ruminants, since this allows releasing a significant amount of high-protein plant feeds (oilcake, meal) in diets. The article contains the results of studying the effect of feeding nitrogenous
substances of non-protein nature on the productivity of young cattle. It was found that the use of 10-, 20- and 25% carbamide concentrate in animal diets increased the degradability of protein in compound feed, blood erythrocyte level by 6.18-7.77%,
hemoglobin concentration by 4.8-6.2%, leukocyte content by 10.3-13.3%, platelets by 4.1-21.5%, which contributed to an increase in the average daily gain by 6.8-11.9%.
This study offers an additional source of information on isolation and purification of the human lactoferrin biosimilar from frozen milk of goat producers. Thanks to the application of an improved technique of raw material degreasing, a milk filtrate with complete absence of the fat part was obtained, which as a result had a favorable effect on the yield and properties of the finished product, whose quality was confirmed by methods of MALDI-TOF mass spectrometry and microbiological analysis. As a result 135 g of human lactoferrin biosimilar was obtained from 75 liters of frozen milk.
Sapropel has long been used as a feed additive to enrich the diet with minerals, amino acids, vitamins and biologically active substances. The purpose of the presented work was to study the effectiveness of the use of organic sapropel from the Udkhodva deposit in the Brest region in the diets of dairy cows. It was found that the inclusion of 4 and 6 % of organic sapropel in the compound feed for dairy cows had a positive effect on feed intake, physiological state and metabolic processes in the body of animals. This made it possible to increase milk productivity by 9.5 and 9.1%, reduce feed costs by 4.9%, the cost of milk - by 6.4 and 4.3%, get additional profit for all products and save 4-6% of grain in compound feed.
Herd of goats producing biosimilar human lactoferrin has been created. The nature of transmission of the transgene through a number of generations, productivity according to target protein, as well as technological parameters of milk containing recombinant human lactoferrin (rhLF) have been studied. The frequency of transgene transmission from parents to offspring was recorded to be in the range of 42.4-52.6%. The median rhLF content in milk of F1 animals was 2.60 g/L, F6 – 2.00±0.85 g/L. In terms of physical and chemical and technological parameters, milk with rhLF meets quality standards. The somatic cells count, being the marker of mammary inflammation (mastitis), has been decreased in milk of producing goats.
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