The use of improved premix recipes in rations of cattle

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Complete balanced feeding of farm animals cannot be organized without the use of various balancing additives, in particular premixes. It is important to note that the greatest eff ect from the use of premixes is observed when their recipes are developed taking into account specifi c feeding and housing conditions. The purpose of this work was to study the eff ectiveness of using improved premix recipes based on an analysis of the actual nutritional value of feed in the rations of lactating cows and calves. During the research, two experiments were carried out. The experiments were carried out at the Staraya Chigla livestock complex in the Anninsky district of the Voronezh region. In the experiment on cows, 20 animals were selected, which were divided into two groups (control and experimental) of 10 heads in each using the method of analogue pairs. In an experiment to study the eff ectiveness of the premix in feeding of young animals, two groups of calves of 12 heads in each were similarly formed. Animals of the control groups received farm rations with the premix developed without taking into account the analysis of the nutritional value of the rations. In the experimental groups, cows and calves received new and improved premixes developed based on these specific feeding conditions. The use of the premix with an improved recipe in the rations of cows made it possible to increase the average daily milk yield by 5,61 %, the fat content by 0,05 abs.% and the protein content in milk by 0,15 abs.%. At the same time, there was an increase in the level of digestibility of dry matter by 1,25 abs.%, organic matter by 1,07 abs.%, crude protein by 1,56 abs.%, crude fat by 1,63 abs.%, crude fi ber by 1,08 abs.%, nitrogen-free extractive substances by 1,87 abs.%. Calculation of feed intake for the synthesis of 1 kg of milk showed that they were lower in the experimental group by 0,31 MJ of net lactation energy and 2,97 g of digestible protein. Positive results were also obtained in experiments on calves. The use of the premix developed on the basis of the actual nutritional value of feed and rations, made it possible to increase the live weight of heifers at 12 months of age by 5,04 %, the average daily gain in live weight during the experimental period by 5,74 %, the relative gain by 1,91 abs.%.