Influence of feed additive Fibreze on the composition of the microflora of the rumen in cows in the period of increasing the milk yield

Abstract

In the rational use of nutrients of rations, in the intensity and level of microbial protein synthesis the conditions created for the development of useful microflora in the forestomachs of ruminants are of paramount importance. The purpose of the researches was to study the influence of the feed additive Fibreze on the composition of the microflora of the rumen of cows during the period of increasing the milk yield. The composition of the bacterial community of the rumen contents has undergone some changes under the influence of enzyme additive Fibreze. The amount of cellulolytic bacteria has increased by 12 %, which the share of rumencoccus has been characterized by the highest excess by 10,62 abs.%. It has been noted the increase by 9,3 % in the total share of bacteria that perform protective function-antagonists (bacilli and bifi dobacteria). The enzyme additive did not significantly influence on the quantitative composition of other groups of bacteria from the normoflora. The total concentration of pathogens, which are an indicator of the state of health of cows has been decreased by 1,3 times. A more effective use of protein nitrogen by the rumenal microflora has been established. The input in the ration of 20 g/head/day of the feed additive Fibreze has been provided the increase fermentation of carbohydrates and led to the increase in the total concentration of volatile fatty acids in the rumen content of cows in all periods of research. For example, the total concentration of volatile fatty acids in the rumen of cows has been increased by 8,73 % during the period of increasing the milk yield. It has been noted the tendency to increase propionic and butyric acids while reducing acetic acid. The biggest economic effect has been achieved in cows that have been received the feed additive in the amount of 20 g/head/day as part of the ration.