Аuthor: M. I. BARASHKIN, candidate of veterinary sciences, associate professor,
Ural State Agricultural University (42 K. Libknehta Str., 620075, Ekaterinburg; tel: +7 (343) 371-33-63)
Abstract: Found that by increasing milk yield of Holstein crossbred cows: the leash-rated content of 3.6 %, with loose — on 7 %, but reduced the period productive use, respectively, 6.8 and 12.7 %. A reduction in the productivity by use of results in a reduction of their life milking and, consequently, reduces the efficiency of use. Despite the fact that the milk yield of cows of Holstein average per lactation was higher than that of purebred at 148–299 kg of milk (3.6–7.0 %; P < 0.05), lifetime milk yield in these groups was lower at stanchion on 599 kg of milk (3.1 %) with loose — on 1175 kg of milk (7.4 %), while the unreliable difference. The highest lifetime milk yield (34724 kg of milk) was obtained from purebred cows of black-motley breed in the group at the fastened with-holding and was up 3873 kg of milk (12.6 %) compared with the hybrid animals and consequently to 5259 kg (17.8 %) and 7348 kg (26.8 %) compared with purebred and crossbred animals with loose housing. When translated into loose housing, in purebred and crossbred cows productive period was reduced by 21.7 and 26.7 %. As a result, the lifetime milk yield in purebred animals is reduced by 19.5 % in hybrid — by 23.1 %. To improve the efficiency of technology with loose content cows should recognize the influence of genetic and paratypical factors on productive longevity of farmed species use technological methods to avoid negative techno-logical pressure on the body of cows, the results of which lead to premature retirement from the herd.
Keywords: productive longevity, cattle, industrial maintenance technology.
