The role of fulvic acid in feeding heifers of reproductive age in the conditions of the Novgorod region

Many domestic and foreign researchers have drawn attention to humic and fulvic acids, which are successfully used in animal husbandry, poultry farming and aquaculture. In search of new ways to increase livestock productivity, as well as the quality of livestock products, the number of scientific studies on the use of humic substances of various origins in animal husbandry has increased significantly, which emphasizes the role of feed additives obtained from local resources. In the article the effectiveness of the use of fulvic acid in the diets of young cattle is presented. Experimental studies were conducted in the Ilyich Agricultural Cooperative of the Starorussky district of the Novgorod region on heifers of the Holstein breed of Dutch breeding older than a year (repair heifers of reproductive age). The animals of the control group consumed a nutritionally balanced basic diet (HR), the first experimental group – HR + fulvic acid (10 ml/head / day), the second experimental group - HR + fulvic acid (15 ml/head /day), 10 heads in each group. As a result of the conducted studies, the positive effect of the use of fulvic acid in the diets of young animals was determined, its effect on the digestibility of nutrients in diets, biochemical parameters of blood, reproductive function was studied, the optimal dose of fulvic acid feeding in this age period was determined. The use of fulvic acid in the diet of young animals allowed to increase the absorption of nutrients from the diet, improve blood biochemical parameters, and improve the reproductive qualities of heifers by 15.5–20.2 %. The results obtained allow us to recommend fulvic acid for use in the diets of repair heifers of reproductive age on farms in the Northwestern region in the amount of 10 ml per head per day.