Analysis of the Relationship Between Type Traits, Inbreeding, and Functional Survival in Jersey Cattle Using a Weibull Proportional Hazards Model From: Journal of Dairy Science | Date: September 1, 2003| Author: Gianola, D; Weigel, K A; Caraviello, D Z | Copyright American Dairy Science Association Sep 2003. Provided by ProQuest LLC.Copyright information

ABSTRACT

A Weibull proportional hazards model was used to analyze the effects of 13 linear type traits, final score, and inbreeding on the functional survival of 268,008 US Jersey cows in 2416 herds with first calving from 1981 to 2000. Functional survival was defined as the number of days from first calving until involuntary culling or censoring. The statistical model included the time-dependent effects of herd-year-season of calving, parity by stage of lactation interaction, and with...

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