Uticaj redosleda telenja na nivo mlecnosti i reprodukcijske osobine razlicitih genotipova goveda.
1989
Zdravkovic J. | Nenadovic M. | Medic D. | Dusanovic Pasello G.
The studies were performed on 125 cows each of Simmental, Summental x RHF, Black and White, and Rotbunt x RHF breed, in order to test the effect of order of calving on the milk yield and reproduction characters of different genotypes of cattle. On the basis of the results obtained the following conclusions may be inferred: The highest yield was obtained in cows of Black and White breed (HF), 6062 kg of milk with 209 kg of butterfat. The lowest yield of milk was found in cows of Simmental (Si) breed, 4830 kg with 184 kg of butterfat. Other genotypes, i.e. crosses Si x RHF and Rtb x RHF are within limits of the preceding two genotypes. With respect to butterfat content, the cows of Simmental had the highest one, 3.81 per cent, while those of Rtb x RHF had the lowest butterfat percentage, 3.42 per cent. The highest fertility rate was found in crosses Si x RHF, which had the shorter service period, of 95 days, while the longest service period was in Black and White cows, 164 days. Other two genotypes are between these extremes. The insemination index was the most favourable in Si x RHF crosses, amounting 1.72, and the least favourable was in Black and White cows, with an average of 2.55 inseminations. By appraisal of the fertility of cows through the percentage of freshened cows and that of cows pregnant by one insemination, it was found that the best results have been achieved in Si x RHF crosses. While the cows of Black and White breed had the lowest fertility characteristics.
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