Biochemical parameters and dynamics of weight of calves depending on the mother's feeding during the interlactation period

Abstract

The results of changes in the biochemical parameters of blood serum and live weight of calves when feeding dry cows with various diets are presented. The experiment was carried out on 30 cows of the Holstein breed and calves obtained from them, contained in the agricultural factory “Plemzavod im. Lenin» Atninsky municipal district of the Republic of Tatarstan. Laboratory studies were performed at the Tatar Scientific Research Institute of Agriculture, FRC Kazan Scientific Center, Russian Academy of Sciences. It was found that the use of experimental premixes in the diet of dry cows in combination with propylene glycol during the dry period promotes the birth of young animals with a greater live weight (28.54 ... 28.63 kg) compared to control animals and allows them to maintain higher growth rates further (gross increase of 58.31 ... 62.41%). In animals of the indicated groups, by the 90th day of life, the content of urea nitrogen in blood serum increases significantly (in individuals of group II by 44.16% (p <0.05)), triglycerides (in animals of group III by 183.33% (p <0.05)), total calcium (in calves of group II, the content of the studied parameter was significantly higher than in animals of group III by 18.75% (p <0.05)), aspartate aminotransferase (in animals of group II by 29.08 % (p <0.01)), and in animals of the control group - only albumin (by 24.55% (p <0.05). On the 60th day of life, individuals of group III have significantly higher than control animals total protein and alanine aminotronsferase in blood serum, and on the 90th day of life, calves of group II are characterized by a significantly higher content of total calcium, compared with individuals of group III.