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Article

Genetic and phenotypic parameters for 305-day yield, fertility, and survival in Holsteins.

Journal of dairy science - 1 Oct 1998

Dematawewa C M, Berger P J

Abstract excerpt

A data file containing 122,715 lactation records of Holstein cows distributed across 11,374 herd-year-season groups was analyzed to obtain (co)variance estimates for yield, fertility and cow survival. Milk, fat, and protein yields were adjusted to 305 d. Days open was truncated to 305 d, and the number of services was truncated to 9. Survival of a cow during a full lactation (305 d) was recorded as 0 (died) or 1...

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PMID: 9812275
DOI: 10.3168/jds.S0022-0302(98)75827-8

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