Published in Scientific Papers. Series D. Animal Science, Vol. LXVI, Issue 1
Written by Vera GRANACI, Valentin FOCSHA, Alexandra KONSTANDOGLO, Vasily CURULIUC, Valentina CIUBATCO
The study results of the reproductive ability of cows depending of their age and milk productivity are presented. The studies were conducted in the Republic of Moldova on cows of the Holstein breed. The optimal parameters for the duration of the SP and CI were detected in cows with milk productivity less than 6000 kg of milk, at which the animals were characterized by the maximum indicators of calves yield and CCR. In cows with a milk yield of 9001 kg or more, a significant increase in the duration of SP (+109.8 days) and the CI (+90.3 days) was observed, the CCR decreased by 0.22, and the yield of calves/100cows per years by 21.7 heads. On average, each increase in milk yield by 1000 kg increases the duration of the SP by 27.6 days, the CI by 20.9 days. The share of the impact (ɳ2x) of level of milk yield on the duration of SP was 18.0% (p<0.001), on the duration of the CI 15.6% (p<0.001), on the CCR 25.6% (p<0.001), the yield of calves 35.6 % (p<0.001). In order to increase the economic profit, we recommend livestock holdings to monitor the duration of SP.
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