Acta Scientiarum Polonorum

Scientific paper founded in 2001 year by Polish agricultural universities

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Zootechnica
(Zootechnika) 11 (2) 2012
Title
CORRELATIONS BETWEEN MILK YIELD IN PRIMIPAROUS PHF COWS AND SELECTED LIFETIME PERFORMANCE AND FERTILITY INDICATORS AS WELL AS REASONS FOR CULLING
Autor
Ewa Januś, Danuta Borkowska
Keywords
Keywords: culling, length of productive life, lifespan, primiparous cows
Abstract
The aim of this study was to assess the correlation between milk yield in primiparous cows and their subsequent productivity, length of productive life, and reasons for culling. The analysis included 386 Black-and-White Polish Holstein-Friesian cows (PHF-HO) culled from the dairy herd during a 9-year period on one farm. Cows which had high milk yield in their first lactation were also found to be more productive in subsequent lactations. However, high milk yield in the first lactation may be associated with significantly shorter lifespan and productive life, as well as lower lifetime milk yield. The length of intercalving periods was not significantly associated with first lactation productivity. As milk yield increased, a lower proportion of cows culled for sterility and other reproductive disorders was observed, while a higher percentage of cows were eliminated for udder diseases.
Pages
23-32
Cite
Januś, E., Borkowska, D. (2012). CORRELATIONS BETWEEN MILK YIELD IN PRIMIPAROUS PHF COWS AND SELECTED LIFETIME PERFORMANCE AND FERTILITY INDICATORS AS WELL AS REASONS FOR CULLING. Acta Sci. Pol. Zootechnica, 11(2), 23-32.
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