Effect of the nitrogen-containing additive on productivity and blood parameters of highly productive cows

The aim of the research is to study the effect of the Optigen feed additive on milk productivity and hematological parameters of freshly calved Holstein cows. The scientific and economic experiment has been carried out at LLC Zazerkal’e on 30 animals divided into the control and experimental groups (15 cows each). The experimental group has been given the additive at a dose of 50 g / head / day 20 days before calving and 100 g / head / day after calving. The research results have shown a reliable increase in the average daily milk yield in the experimental group by 3.5%, gross yield of basic milk - by 16.1%, as well as an increase in the hemoglobin level (92.2 - 105.7 g / l) and total protein in the blood serum (65.65 to 82.01 g / l). The Optigen feed additive helps to optimize nitrogen metabolism and to improve the productivity of cows.