УДК: 636.22/.28.084.523+636.22/28.087.8;615.355
DOI: 10.36871/vet.zoo.bio.202403012
Authors
Yuri P. Fomichev,
Nadezhda V. Bogolyubova,
Federal Research Center for Animal Husbandry named after
Academy Member L. K. Ernst, Dubrovitsy, Russia
Igor Yu. Ermakov,
North Caucasus Zonal Veterinary Research Institute – branch
of Federal Russian Agrarian Scientific Center,
Novocherkassk, Russia
Abstract
The research was carried out on 2 groups of dairy cows of 30 heads each on a farm with the formation of technological groups according to calving dates and milking on a unit with individual milk yield accounting. The cows of the experimental group, in the period two weeks before calving and for 2 months after calving, were added to the diet, respectively, 150 and 300 ml/head/day of energy feed based on propylene glycol and glycerol with a complex of cellulase, xylase, β-gluconase and glucoamylase enzymes. activity (EFEC). The main diet consisted of traditional feed and was designed to produce an average daily milk yield of 25 kg of milk. EFEA had virtually no effect on the pH and ammonia content in rumen chyme, but increased the VFA content in it by 3.6 %. It had no effect on the total microbial mass, but reduced the ciliate population by 23.5 % and increased the bacterial population by 27.8 %. EFEC had a positive effect on protein-nitrogen metabolism, functional state of the liver, antioxidant activity, hormonal status and hematology.<br> As a result, during 3 months of lactation, the average daily milk yield of cows in the experimental group was 19.9, 20.9 and 21.1 kg of milk (P<0.001), which was 13.0 higher than in the control. 9.4 and 16.5 %, respectively, but at the same time there was a decrease in fat and protein content in milk.
Keywords
dairy cows, sheep. exogenous enzymes, rumen digestion, metabolism, productivity
