2010-Cecchinato_et_al - The relevance of purebred...

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A. Cecchinato, G. de los Campos, D. Gianola, L. Gallo and P. Carnier of crossbred piglets The relevance of purebred information for predicting genetic merit of survival at birth 2009-11-06T08:41:26-08:00; 2010, 88:481-490.doi: 10.2527/jas.2008-1744 originally published online J ANIM SCI http://jas.fass.org/content/88/2/481 the World Wide Web at: The online version of this article, along with updated information and services, is located on www.asas.org by guest on May 21, 2011 jas.fass.org Downloaded from
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ABSTRACT: The objective of this study was to infer (co)variance components for piglet survival at birth in purebred and crossbred pigs. Data were from 13,643 (1,213 litters) crossbred and 30,919 (3,162 litters) pure- bred pigs, produced by mating the same 168 purebred boars to 460 Large White-derived crossbred females and 1,413 purebred sows, respectively. The outcome variable was piglet survival at birth as a binary trait. A Bayesian bivariate threshold model was implemented via Gibbs sampling. Flat priors were assigned to the effects of sex, parity of the dam, litter size, and year- month of birth. Gaussian priors were assigned to litter, dam, and sire effects. Marginal posterior means (SD) of the sire and dam variances for liability of piglet sur- vival in purebred were 0.018 (0.008) and 0.077 (0.020), respectively. For crossbred, sire and dam variance es- timates were 0.030 (0.018) and 0.120 (0.034), respec- tively. The posterior means (SD) of the heritability of liability of survival in purebred and crossbred and of the genetic correlation between these traits were 0.049 (0.023), 0.091 (0.054), and 0.248 (0.336), respectively. The greatest 95% confidence region (−0.406, 0.821) for the genetic correlation between purebred and crossbred liabilities of piglet survival included zero. Results sug- gest that the expected genetic progress for piglet sur- vival in crossbreds when selection is based on purebred information may be nil. Key words: Bayesian analysis, genotype × environment interaction, piglet survival, threshold model ©2010 American Society of Animal Science. All rights reserved. J. Anim. Sci. 2010. 88:481–490 doi:10.2527/jas.2008-1744 INTRODUCTION Crossbreeding of swine is widely accepted as an ef- fective commercial production practice (Merks, 1988). Structured crossbreeding can exploit additive and non- additive genetic effects to advantage (Siegel, 1988). Al- though economic returns in pig production derive main- ly from crossbred performance, selection of prospective parents is usually based on purebred performance. The genetic correlation between purebred and cross- bred performance provides an indicator for evaluating the effectiveness of reciprocal recurrent selection (Com- stock et al., 1949), combined purebred and crossbred se- lection (Wei and van der Werf, 1994), and of the use of data recorded only in crossbreds for evaluation of pure- breds (Lutaaya et al., 2001). Often, estimates of such genetic correlations for production traits have been less than unity (Merks, 1988; Wei and van der Werf, 1995) indicating that selection of parents in one type of mat- ing system may not optimize progeny performance in another type of system (Mulder and Bijma, 2005).
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This note was uploaded on 01/26/2012 for the course ECON 2272 taught by Professor Gay during the Spring '08 term at Birmingham-Southern College.

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2010-Cecchinato_et_al - The relevance of purebred...

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