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Effect of milk yield, season of calving and lactation number on fertility of Polish Black-and-White Lowland cows



Effect of milk yield, season of calving and lactation number on fertility of Polish Black-and-White Lowland cows



Prace i Materialy Zootechniczne (14): 55-66



Analysis of 3822 lactations of 1274 pedigree cows revealed low but highly significant correlation coeff. (about 0.2) between milk yield (av. 4425 kg) and calving interval (av. 382 days); regression coeff. indicated that calving interval lengthened by 1.1-1.8 days for each 100 kg increase in milk yield.

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