Effect of carbohydrate hydrolytic enzyme complex in combination with energy feed on rumen digestion, metabolism, productivity and fatty acid composition of milk fat in cows

Abstract

The research was carried out on 2 groups of dairy cows of 30 heads on the farm with the formation of technological groups according to the timing of calving and milking on the unit with individual accounting of milk yield. 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 energy feed based on propylene glycol and glycerin with a complex of enzymes cellulase, xylase, beta-gluconase and glucoamylase activity (EFEC). The main diet consisted of traditional feed and was designed to receive an average daily milk yield of 25 kg of milk. EFEC had practically no effect on the pH and ammonia content in the rumen chyme, but increased the content of VFA in it by 3.6%. It had no effect on the total microbial mass, but reduced the population of infusoria by 23.5% and increased the bacterial population by 27.8%. EFEC had a positive effect on protein-nitrogen metabolism, liver function, antioxidant activity, hormonal status and hematology. As a result, during 3 months of lactation, the average daily milk yield in cows of the experimental group was 19.9, 20.9 and 21.1 kg of milk (P<0.001), which was higher than in the control by 13.0, 9.4 and 16.5%, respectively.