Published in Scientific Papers. Series "Management, Economic Engineering in Agriculture and rural development", Vol. 22 ISSUE 2
Written by Leontiі KHMELNYCHYI, Serhiі KHMELNYCHYI

Аssessment studies of sires by indicators of lifelong performance of their daughters were performed in the herd of the raising Ukrainian Red-and-White dairy breed of the Mayak agricultural company, Zolotonosha district, Cherkasy region in Ukraine. The significant influence of bull-breeders on the lifespan, rates of productive use and lifelong performance of offspring, which was determined by personal inheritance of breeders, has been established. Changeability of daughters’ lifespan of estimated breeders differed over a wide range – 3.005-3.462 days, terms of productive use – 2.188-2.626 days, and number of used lactations from 2.5 to 5.6. By the best rates of lifelong dairy productivity was differed the progeny of breeders with higher lifespan and productive use. The highest yield for one day of life and productive use was obtained by offspring of sires, which had higher rates of milk production during the first lactation and shorter longevity. The level of relationship between the yields for 305 days and lifespan indicators of sire's offspring differed by significant variability from moderate negative with longevity (r=-0.244) to positive with productive use (r=0.259). Obtained correlations between milk yield value for the first lactation and lifelong productivity of the offspring of evaluated breeders by the degree (r=0.055–0.659) and reliability (P<0.05–0.001) were characterized by positive and reliable values. This was certifying the possibility of milk yield during the first lactation to be a predictor of cows’ lifelong production. The high productivity of daughters of the estimated breeders during the first lactation did not provide a similar growth in their economic use, but will guarantee lifelong milk productivity. The offspring of sires of domestic selection were not inferior by the productive longevity indicators to the offspring of purebred Holstein breeders.

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