Article
Phenotypic associations between traits other than production and longevity in New Zealand dairy cattle.
Journal of dairy science - 1 Aug 2005
Berry D P, Harris B L, Winkelman A M, Montgomerie W
Abstract excerpt
A proportional hazards model was used to investigate the phenotypic effect of traits other than production (TOP) on true and functional longevity across purebred and crossbred Holstein-Friesian and Jersey dairy cattle in registered and commercial herds in New Zealand. The hazard function was described as the product of a baseline hazard function and the time-independent effects of age at first calving, heterosis,...
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