DOI: 10.36871/vet.zoo.bio.202109009
UDC 636.2.084.412
Authors
A. V. Golovin
Doctor of Biological Sciences, Professor, Chief Researcher of the Department of
Feeding Farm Animals, Federal Research Center of Animal Husbandry –
VIZ named after Academician L. K. Ernst,
Dubrovitsy, Russian Federation
Abstract
In a scientific economic experiment conducted in the experimental farm «Klenovo-Chegodaevo» (Moscow) on three groups of Holsteinized black-and-white cows with a milk yield of 10 kg of milk per lactation, 7000 heads in each, it was found that the inclusion in the diet of cows of the experimental groups tested protected fats (hydrogenated and fractionated) in the amount of 300 g per head per day, contributed to the tendency for more intensive metabolic processes in the rumen due to a slight increase in the concentration of volatile fatty acids by 5,6–7,4% and an increase in the mass of microorganisms in the contents of the rumen by 5,4–14,4% (P≥0,05). At the same time, an increase in the concentration of metabolic energy in the dry matter of the cows ration from 10,7 to 11,0 MJ / kg in the period from 21 to 120 days of lactation, due to the inclusion of protected fats in the diet of cows from the experimental groups, contributed to an increase in milk yield 4% fat content for 100 days of the experiment by 9,7% and 11,0% (P≤0,05), compared with the control, as well as the production of milk fat and protein, respectively by 9,6–11,0% (P≤0,05 in the second case) and 7,4–8,3%, feed costs expressed in ME decreased by 4,9–5,2%.
Keywords
feeding of milk cows, protected fats, rumen metabolism, milk production.
