Features of development repair heifers Ukrainian Red-and-White and Black-and-White dairy breeds in the farms of Sumy region

In Sumy region's leading farms have been studied the growth features of repair heifers Ukrainian Black-and-White (PE "Burynske") and Red-and-White (LLC "Mlyniv complex") dairy breeds. The absolute and relative growth rates of live weight of heifers in age dynamics from birth to 18 months of age were investigated. Best of body weight at birth appeared heifers of Ukrainian Red-and-White dairy breed (36.2 kg) compared to peers Ukrainian Black-and-White dairy breed (33.9 kg). Their advantage was preserved during the 18-month period of growth. Repair heifers Ukrainian Red-and-White dairy breed at the final stage of development with average live weight 414.2 kg exceeded peers Ukrainian Black-and-White dairy with highly reliable difference on 15.5 kg (P <0.001). The development of both breeds repair heifers within the obtained parameters of live weight provided their gain during the mating age at the level of 76-80% of the minimum target standards set on the long-term for cows firstborn of dairy type created breeds. The average daily live weight gain in the dairy period amounted to 810.4 g at heifers of Ukrainian Black-and-White dairy breed, and 847.3 g in their peers of Ukrainian Red-and-White breed. After a six-month growing period and up to the mating age, the difference in average daily increments was higher in animals of Ukrainian Red-and-White dairy breed herd of LLC "Mlyniv complex". The results of research have shown that under the creation of appropriate conditions for feeding and keeping, the repair heifers of Ukrainian Black-and-White and Red-and-White dairy breeds are capable to high-intensity growth rates.