Prediction of longevity breeding values for US Holstein sires using survival analysis methodology

Journal of Dairy Science
D Z CaravielloD Gianola

Abstract

Breeding values of Holstein sires for daughter longevity in each of 9 geographical regions of the United States were predicted using a Weibull proportional hazards model. Longevity (also commonly referred to as herd life or length of productive life) was defined as the number of days from first calving until culling or censoring. Records from 2,322,389 Holstein cows with first calving from 1990 to 2000 were used. In addition to the sire's additive genetic merit, our failure time model included time-dependent effects of herd-year-season of calving, parity-stage of lactation, and within-herd-year quintiles for mature equivalent fat plus protein yield, as well as the time-independent effect of age at first calving. Sire variances and parameters of the Weibull distribution were estimated separately for each region. The relative risk of culling for daughters of each individual sire was expressed relative to that of daughters of an average sire (within a specific region). Predicted breeding values for functional longevity, expressed as relative risk ratios, ranged from 0.7 to 1.3. Sizable differences were observed between geographical regions in sire rankings, as well as estimated sire variances and gamma parameters (of the distribut...Continue Reading

Citations

May 24, 2017·Animal : an International Journal of Animal Bioscience·D A GarciaL G Albuquerque
Apr 25, 2009·Journal of Dairy Science·F ForaboscoW F Fikse
Jul 15, 2006·Journal of Dairy Science·P M VanRadenM E Tooker
Feb 14, 2013·Journal of Dairy Science·J R WrightR R Neitzel
Jan 1, 2012·Animals : an Open Access Journal From MDPI·Chris W RogersErica K Gee
Feb 22, 2012·Animal Science Journal = Nihon Chikusan Gakkaihō·Osamu SasakiMasahiro Satoh
Jul 7, 2007·Genetics, Selection, Evolution : GSE·Oscar González-Recio, Rafael Alenda

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