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The aim of the study was to investigate how leptin R4C single nucleotide polymorphism (SNP) in the leptin gene affects the somatic cell count (SCC) in milk as well as milk production traits such as daily milk yield, fat content, protein content, lactose content, and dry matter content in milk. A total of 162 Polish Holstein- -Friesian (Red-White strain) cows were used in this study. The genotype and...
The aim of the analysis was the assessment of some milk yield features of heifer cows starting milk production within the space of the last twenty years. Research material consisted of information about milk yield of 3357 heifer cows of Black-White breed with lactations no shorter than 260 days of milking from one of the high yield cattle herds in South-West Poland. Assessed features like the percentage...
The aim of this study was ascertainment influence of crossing native breeds red-white and black-white holstein-fresian and ayrshire breeds. On the ground of this analysis it's possible to ascertain that milk composition of cross-breds is not to stray from milk composition of red-white and black-white breeds. Unimportant differences in yield lovels was resulted rather from higher production level of...
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