Re-selection effectiveness of Kostroma purebred cattle

УДК 636.22/28.082

The research has been organized at “Experimental farm “Karavaevo” in 2015. Cows after re-selection exceed other selection types cattle in milk productivity 133kg(Р<0,001) during the 3-rd and more lactation period and 213 kg (Р<0,001) in the highest lactation time. From 70 re-selection cows 33(47%) have milk productivity more than 8000 kg during 305 lactation days. It has been noticed high breed value of bulls: Krik 9194, Ryadoc 3023, Bushuy 2726 Master›s relative 106902, Spike 5169 Leyrd›s relative group 71151 and Lednik bull 3518 Ladka›s line КТКS-253. High levels of milk production in purebreed families have been observed in animals obtained by selecting options AB × BB, AB × AB, BC × AA by EAB - blood group locus. Re-selection is of great practical importance by preparation of bulls-continuers. Thus our studies has been shown practical value of reselection in breeding dairy cattle. Genetic markers of blood groups using in selection planning allows to identify their most desirable options.

Desk02 theme