productive ability of high-producing cows, and qualitative parameters of their offspring, under conditions of intensive milk production
Objective: To study the methods of increasing the reproductive qualities and indices of viability in the offspring of Holstein cows under conditions of intensive milk production. Methods: Studies were conducted on 3 groups of Holstein cows with 30 heads in each group. Animals of the experimental groups had a different length physiological period. The study focused on experimental groups of animals: the reproductive indicators, the viability of newborn calves, and their growth rate. All the digital materials of the experimental data were processed by the method of variation statistics for the significance of the difference of the compared parameters using the Student’s criterion, adopted in biology and zootechnics. Results: Studies found that reduction of the duration of the service period, along with a simultaneous increase in the inter-lactation period to 80–90 days, increased the reproductive capacity of the cows, and enhances the viability of the offspring compared with their peers. Conclusions: The study revealed the optimal duration of the physiological periods in highproducing cows under conditions of intensive milk production technology.
Khamidulla B. Baimishev, Murat H. Baimishev, Vasily S. Grigoryev, Alexander P. Kokhanov, Inna V. Uskova, Ismagil N. Khakimov. Increase in reproductive ability of high-producing cows, and qualitative parameters of their offspring, under conditions of intensive milk production. Asian Pac J Reprod 2018; 7(4): 167-171.