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The objective of this study was to determine relationships between sire effect, milk production in young cows, their performance in subsequent lactations, fertility, conformation and productive longevity. A total of 1724 cows that first calved between 2003 and 2005 were analyzed during 4475 lactations. The cows were kept in 10 barns located in the Provinces of Pomerania and West Pomerania, Poland...
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...
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