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The aim of the study was to analyse the course of calving in Polish Holstein-Friesian cows serviced with the semen of Belgian Blue bulls. Data for the researches was provided by the results of the calving of 155 cows inseminated with the semen of Belgian Blue bulls. The data covered both calving difficulties as well as stillborn calves. The cases of difficult deliveries in commercial crossing were...
The aim of the research was to determine the influence of multiple pregnancy on delivery complications and calf mortality. The experiment was conducted on 6755 cows in which at least one multiple calving took place. Data came from the documentation of the Polish Federation of Cattle Breeders & Milk Producers and concerned calving type, sex structure of the newborn calves, as well as their perinatal...
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