Abstract
The article presents results of the studies on application of Biopinnular sorption-probiotic feed additive in feeding of lactating cows in the amount of 0.25; 0.5 and 0.75% of the dry matter of the ration in the conditions of the dairy complex OOO Agrofarm “Tetyushskoye” in Ulyanovsk region. A comparative analysis of the data obtained during the research confirms the positive effect of the studied additive on the processes of ruminal digestion, which is accompanied by an increase of concentration of volatile fatty acids (by 9.78% and 11.69%), cellulolytic activity of bacteria and absorption of ammonia nitrogen. This provides a corresponding increase of productive effect of feed and thereby causes a greater supply of nutrients to blood for milk synthesis, which has a positive effect on an increase (by 3.46 ... 12.60%) of milk productivity level of cows and the mass fraction of fat in their milk. The usage of the studied feed additive in the rations of cows enables to reduce the concentration of heavy metals (lead and cadmium) in their milk (by 10.75 ... 43.48% and 12.63 ... 28.58%) and products of its processing. The most effective in terms of biological and zootechnical parameters is usage of the studied feed additive at a dose of 0.25 and 0.5% of the ration dry matter.
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