Published in Scientific Papers. Series D. Animal Science, Vol. LXVII, Issue 2
Written by Vera GRANACI, Valentin FOCSHA, Vasily KURULYUC, Valentina CIUBATCO
The reproductive performances (SP - service period, CI - calving interval, CCR - Reproductive capacity coefficient) of Jersey (Js), Holstein (HL) cow populations of French, Dutch and local selection were studied, in the period of adaptation to the new operating conditions. It was established that the most significant deviations from the optimal physiological value of SP and CI are found in the Js breed (SRL "Agro-Gogu") (+104.9 and +113.4 days) and in the local selection HL population (SRL "Gomets Efrem") (+78.2 and 88.6 days). In the dynamics of lactation, the duration of SP and CI, regardless of the animal husbandry, but also of the breed, is far above the optimally allowed values. The most favorable results are attested to heifers first calving of the French HL breed. The CCR reached the maximum value in cows HL of local selection, from the second lactation, followed by the Js population. The analyzed data reveal that the adaptive response of the animals to the new conditions is very slow, with breed differences and intrabreed variability.
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