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Article

Estimation of genetic parameters for functional longevity in the South African Holstein cattle using a piecewise Weibull proportional hazards model.

Journal of animal breeding and genetics = Zeitschrift fur Tierzuchtung und Zuchtungsbiologie - 1 Oct 2017

Imbayarwo-Chikosi V E, Ducrocq V, Banga C B, Halimani T E, van Wyk J B, Maiwashe A, Dzama K

Abstract excerpt

Non-genetic factors influencing functional longevity and the heritability of the trait were estimated in South African Holsteins using a piecewise Weibull proportional hazards model. Data consisted of records of 161,222 of daughters of 2,051 sires calving between 1995 and 2013. The reference model included fixed time-independent age at first calving and time-dependent interactions involving lactation number,...

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PMID: 28295685
DOI: 10.1111/jbg.12264

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