UDS 636.22/.28.082 INFLUENCE OF THE AGE OF COWS ON INDICATORS OF REPRODUCTIVITY AND MILK PRODUCTIVITY
INFLUENCE OF THE AGE OF COWS ON INDICATORS OF REPRODUCTIVITY AND MILK PRODUCTIVITY
DOI:
https://doi.org/10.52269/22266070_2022_3_142Keywords:
Holstein breed, reproductive ability, service interval, milk productivity, intercalving period, insemination indexAbstract
The profitability of dairy cattle breeding is determined not only by quantitative indicators of productivity but also by reproductive qualities, which serve as indirect indicators of adaptability to breeding conditions. We carried the studies out in «Saryagash» LLP, Denisovsky district, Kostanay region. In the studied population, the average duration of the service period for the herd of Holstein cows is 156.03 days. The longest service period was recorded in cows of 4 lactations, so the cows of this group were fruitfully inseminated only on the 190th day after calving. The index of insemination of cows for 4 lactations was 2.35 with a service interval of 57.1 days. Cows on the 3rd lactation had more optimal indicators of reproductive ability, so it characterized them by a service period of 139.5 days, with an insemination index of 1.51. Due to the extended service period, the average duration of lactation for the cows of «Saryagash» LLP is 371 days with average productivity of 6819.44 kg of milk per completed lactation. We recorded the level of productivity above the average value for the herd of cows in the 1st lactation and cows of the oldest lactations (9 heads in the 5-6th lactation).
