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Porównano długość życia i użytkowania, produkcyjność życiową oraz wskaźniki życiowej efektywności użytkowania mlecznego 8223 krów rasy czarno-białej, które wybrakowano w latach 1980-2002 i 2003-2014 z 334 stad w województwie lubelskim. Nie wykazano istotnych różnic w wieku pierwszego wycielenia, długości życia i użytkowania oraz liczbie wycieleń między krowami wybrakowanymi w dwóch wyodrębnionych...
The aim of this study was to compare the milk and reproductive performance of primiparous cows imported from the Netherlands (group 1, n=88) and Germany (group 2, n=42) with cows bred in Poland (group 3, n=53), managed on a large-scale farm. Milk urea concentration and somatic cell count were also compared. Cows of group 1 were characterized by having the highest milk yield (6874 kg), fat (272.9 kg)...
The aim of the study was to determine the freezing point variability of udder milk samples from Black & White cows depending on their genotype, age, daily milk yield and lactation stage. The freezing point and chemical composition of 63800 udder milk samples collected from 12437 cows were determined using CombiFoss 5000 apparatus. The freezing point of milk from cows with a high HF breed genes...
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