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The study was conducted during the years 2005-2007. The experimental materials comprised 48 Holstein-Friesian primiparous cows purchased from Germany. The objective of the study was to determine relationships between the genetic variants of selected milk proteins and the yield and composition of milk produced over the first 305-day lactation and full lactation, and the reproductive traits of cows...
The aim of the study was to analyze the effect of a successive lactation and its stages on the yield and composition of milk in Jersey and Polish Holstein-Friesian (PHF) cows. Investigations were conducted from 1999-2005 on 117 Jersey and 408 PHF cows, kept in the same barn. Higher contents of butterfat (+1.79%), protein (+0.71%), solids (+1.95%) and urea (+7.5 mg/l) were found in the milk of Jersey...
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