Influence of the inside and outside environment on reproductive indexes of cows and heifers
2002
Krajnak, P. (Slovenska Polnohospodarska Univ., Nitra (Slovak Republic))
In presented research work, author evaluates reproductive performance of bovine cattle breeding (Slovak spotted breed and its female crosses) and any action that may influence it. Evaluation has been done on the basis of reproduction analysis of reproduction and metabolic tests from vascular sera. The age of heifers at the time of the first insemination ranged from 18 to 19 months, the age on the first calving was 28-29 months. The variation span of insemination interval was 19-180 days, of interinsemination intervals 4-338 days. The pregnancy dosed up to 45% after the first inseminations, service period was about 110 days and interim period was below 400 days. The natality was below the average. The pregnancy level is influenced especially by the milk yield. As to the antagonism frontier between milk and reproductive performance it was noticed by 15 kg milk per cow and day. There is less influence of season, insemination order, and the length of insemination interval on pregnancy under given conditions of breeding. The influence of the metabolic background factors is unequivocal
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