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Na podstawie wyników z 369 060 próbnych dojów 22 997 krów rasy polskiej holsztyńsko- fryzyjskiej odmiany czarno-białej, będących pod oceną użytkowości mlecznej na Pomorzu i Kujawach, wycielonych po raz pierwszy w 2000 i 2001 roku i użytkowanych do 2008 roku analizowano wpływ miesiąca laktacji, wydajności dobowej, wielkości stada oraz pory roku na udział prób mleka o określonej zawartości białka i...
The aim of the study was to determine the influence of the maintenance system on chosen production and reproduction features in the life span of cows of Red-White breeds maintained in environmental-feeding conditions that occur on individual farms of south-east Poland (Podsudecie). Research covered 237 cows of Polish Holstein-Friesian breed of Red-White variety and Polish Red-White breed kept indoors...
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