Published in Scientific Papers. Series D. Animal Science, Vol. LXIV, Issue 1
Written by Vera GRANACI, Valentin FOCSHA, Vasile CURULIUC, Valentina CIUBATCO
Breeding indices and their interrelations with milk productivity were studied with the Holstein cow populations, of different origins (Dutch, German and French). The value of the main reproduction indices in the investigated populations significantly exceeds the maximum allowable limits. The shortest SP is at Dutch Holstein cows, the German exceeds the first by 7.1 days, the Holstein-Prim, French cows - by 32.9 days those of Dutch and by 5.8 days the cows of German origin. The longest DL has Holstein-Prim, French cows, exceeding by 66.4 days the Dutch, by 35 days the German, which in their turn exceeds, Holstein, Dutch by 31.4 days. The CI exceeds the maximum allowable value (365 days) forming the following string: Dutch Holstein (+75.7 days) ˂ German Holstein (+99.9 days) ˂ French Holstein- Prim (+136.4 days) and the RCC of cows - Dutch Holstein (0.87) ˃ German Holstein (0.82) ˃ French Holstein-Prim (0.81). Between the RCC and the indices of milk productivity on total lactation were established strong and very strong negative correlations and mostly negative from medium to very weak with the same indices on normal lactation.
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