Abstract
The objective of this study was to determine the effects of supplementing the diets of dairy cows with isomers of linoleic acid on their milk yield and composition, digestion and blood parameters. The experience carried out a method of the periods on 3 cows - first heifers (average live weight 575 kg, >90 d post partum). In all periods of experiment of a cow obtained a ration from keeping 50–60% of concentrated foods on nutritiousness. At the end of each period carried out balance measurements for the count of consumption of a forage, secretions urine, a faecal matter, and also determined a respiration research (mask method), weighed animals, defined digestibility nutrients, parameters of microbiological processes in rumen. Supplementing in the diets 40 g (2nd period) or 80 g (3rd period) per day led to a decrease in the yield of lipids with milk by 8–18% (P < 0.05) (content of fat in milk 3.5, 3.3 and 3.8%, respectively, P < 0.05) compared with the control against the background of a lack of shifts in the level of enzymatic and microbiological processes in the rumen, digestion in the gastrointestinal tract and daily production of milk proteins. In the 2nd and 3rd periods, the concentration of insulin 3 h after feeding increased by 76 and 121%, respectively (P < 0.05), relative to the level before feeding. The obtained data give grounds to assume that the essential role of the fat-depressing action of CLA in cows belongs to the endocrine system, in particular to the influence of insulin with the modification of the hormonal regulation of metabolic processes in the body.
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Kharitonov, E., Berezin, A. (2022). The Absorption of the Precursors of Milk Components by the Udder of Cows at Different Milk Fat Content. In: Muratov, A., Ignateva, S. (eds) Fundamental and Applied Scientific Research in the Development of Agriculture in the Far East (AFE-2021). AFE 2021. Lecture Notes in Networks and Systems, vol 354. Springer, Cham. https://doi.org/10.1007/978-3-030-91405-9_74
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