Hematological indicators, micro-elemental composition of blood and intensity of growth of calves depending on the feeding of the mother in the dry period

Abstract

Depending on the characteristics of mothers feeding, the results of assessing the morphological composition of blood and some hematological parameters, trace element composition of blood and the dynamics of the average daily gain in live weight of calves are considered. In the Atninsky municipal district of the Republic of Tatarstan in the agricultural production complex “Plemzavod named after Lenin ”conducted a research and production experiment on Holstein cows (30 heads), as well as on calves that were received from them. All laboratory studies were carried out in the department of agrobiological research of the Tatar Scientific Research Institute of Agricwlture, FRC KazSC RAS. It was revealed that the content of leukocytes on the 60th day in calves of group II was significantly (p <0.05) lower than in control animals by 41.31%. On the 90th day, the hemoglobin concentration in individuals of the control and III groups significantly increased by 27.05% (p <0.001) and 29.69% (p <0.01), respectively. On the 60th day, the concentration of cobalt in individuals of group III was significantly (p <0.01) higher than in animals of group II by 7.94%. A significant increase in zinc concentration on the 90th day was found in individuals of the experimental groups - by 30.04 (p <0.01) and 19.56% (p <0.001), respectively, and manganese - for calves in the control %, p <0.01). Evaluation of the average daily gain showed the presence of a trend of its superiority in individuals of group III over the rest by 17.96 and 7.44% compared with animals of groups I and II, respectively.