The relationship between milk productivity and reproduction in cows in highly productive Ayrshire herds

The purpose of the study is to relationship between rates dairy productivity and reproduction cows in highly productive Ayrshire herds Republic Karelia. Materials methods. work was performed on basis four Stud Airshire rock at "Megrega" trivial, "Ilyinskoe", Mayak LLC, Agrocomplex OJSC. V. M. Zaitseva "(Republic Karelia). Data reproductive ability are collected processed 24,720 cows. zootechnical accounting bonitations for 2004-2020 were used. At end observation period, 7500-8500 kg milk. From indicators cows, amount fishing, fat products full lactation 305 days lactation, from - duration service a dry an interstitial period (MOP), age first calf, during selection, causes selection taken. main biometric constants (X ̅, ϭ, CV) calculated, grouping method used characterize signs calculated correlation coefficients. Results. milk studied 4 with average A high positive yield production (SP) established, coefficient up 0.929 (P<0.001), which consistent data other researchers this problem. It shown that 8500-9000 milk, SP 135-140 justified. noted decrease calving led increase entire herd (r =-0.676; -0.686; P<0.05). relatively short use recorded – 3.5-3.7 lactations, while aged six lactations older significantly exceeded herd. This leads =0.935; P<0.001) proportion =0.788; P<0.05) Cows can stay herd, provided their performance exceeds level influence length MOP manifested not only within one but also adjacent lactation. found less than 6000 9500-10000 or more previous subsequent increased 112 170 days, 391 436 (correlation coefficients 0.138 (P<0.01) 0.870 (P<0.001). Conclusion. results obtained indicate need develop operating conditions provide combination record normal abilities. In particular, ensure maximum optimization feeding conditions, maintenance, breeding veterinary services, control animal health.