Published in Scientific Papers. Series "Management, Economic Engineering in Agriculture and rural development", Vol. 22 ISSUE 4
Written by Vera GRANACI, Valentin FOCSHA, Alexandra CONSTANDOGLO

The chronology of reproductive indices over 4 years, the interrelationships between milk productivity and reproductive indices in Holstein cows of Dutch origin and the share of action of milk productivity on reproductive indices were investigated. In the specific operating conditions created, the maximum level of milk productivity, at which optimal indicators of reproductive capacity were observed was up to 7,000 kg of milk per lactation. Regression analysis shows that with the increase in service period and calving interval by 1 day, the milk production of the animals will increase by 11.0 kg and 13.1 kg, respectively. The share of action of milk productivity on the coefficient of the reproductive capacity of cows is 0.9008 (P˂0.01), on the service-period – 0.147 (P˂0.05), on the birth coefficient - 0.0568. For a full realization of the potential of milk productivity and reproductive indices of Holstein cows of Dutch origin, it is necessary to optimize feeding conditions, microclimate, veterinary control, etc. Increasing the duration of the service period and prolonging lactation leads to the slowing down of the reproduction rate of the herd, due to the losses of milk and calves, as a whole on the herd. For this reason, livestock farms should monitor the duration of the service period.

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