Evaluation of milk yield of Three-breed (1/4 Caucasian grey x 1/4 Jersey x 1/2 Holstein) genotype cows under conditions of manger-pasture keeping

Armenian National Agrarian University, Yerevan, Armenia

^* Corresponding author: naz3@mail.ru

Abstract

The F6 generation cows, which were made from “itself” breeding of three-breed cows (1/4 Caucasian Gray x 1/4 Jersey x 1/2 Holstein) (1/4 CG x 1/4 J x 1/2 H), the 305 days of first lactation exceed the Holstein breed to the standard by 175 kg or 4.2 %, milk fat content by 0.65 %, protein by 1 %, milk fat by 33.5 kg or 22.2 %. During pasture period from each cow was obtained 2540 kg of milk conforming to sanitary and hygienic standards. In the third calving, 170 days of pasture period and 195 days of manger keeping, the amount of milk in 305 days of lactation was 5337 kg, the amount of milk fat + milk protein was 407.7 kg, the reproductive ability was 100%. During manger period 0.77 FU (feed unit) or 0.90 EFU (energetic feed unit) and 80 g of digestible protein were spent to produce 1 kg of milk. The realization of pasture promotes to the increase generation, high vitality, proportionated exterior, strong limbs and a dense composition.