2010-Bouwman_et_al - Maternal and social genetic effects on...

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A. C. Bouwman, R. Bergsma, N. Duijvesteijn and P. Bijma weaning Maternal and social genetic effects on average daily gain of piglets from birth until doi: 10.2527/jas.2009-2494 originally published online May 21, 2010 2010, 88:2883-2892. J ANIM SCI http://jas.fass.org/content/88/9/2883 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 September 18, 2011 jas.fass.org Downloaded from
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ABSTRACT: The aim of this study was to investi- gate whether there is heritable social variation in ADG from birth until weaning in piglets. Nursing and the establishment of teat order are sources of social interac- tion among suckling piglets nursed by the same sow. If a heritable social effect is present, but ignored, the se- lected animals might be the most competitive ones with negative effects on growth of their group mates, result- ing in less response to selection than expected. The social interaction model was extended with a maternal component to estimate genetic maternal and social ef- fects. Four different animal models were compared: a basic model with a direct heritable effect only; a so- cial model accounting for direct and social heritable ef- fects; a maternal model with a heritable maternal effect in addition to the basic model; and a social-maternal model accounting for direct, social, and maternal heri- table effects. Estimates of direct, maternal, and social heritability were 0.07, 0.06, and around 0.0007 (not significantly different from zero, SE = 0.0005), respec- tively. Total heritable variance, including direct, social, and maternal heritable variance and their covariances ranged from 0.07 to 0.15 of the phenotypic variation. Both maternal models were significantly better than equivalent nonmaternal models ( P ≤ 0.005). The social model was not significantly better than the basic model ( P = 0.102), and the social-maternal model was also not significantly better than the maternal model ( P = 0.486). There was no evidence for heritable social ef- fects among piglets in a group. The generally used ma- ternal model fit the data as well as the social-maternal model. Sufficient cross-fostering is needed to partition social and maternal variation. Key words: average daily gain, competition, genetic parameter, maternal effect, piglet, social interaction ©2010 American Society of Animal Science. All rights reserved. J. Anim. Sci. 2010. 88:2883–2892 doi:10.2527/jas.2009-2494 INTRODUCTION Performance of populations kept in groups may be affected by social interactions among individuals (Griff- ing, 1967; Muir, 1996). Social interactions can be due to competition for limited resources or due to social behavior and can result in reduced growth and pro- duction, or in injuries and death (Muir, 1996, 2005). Social genetic effects, if present, should be considered during selection to obtain the desired selection response (Muir, 2005; Bijma et al., 2007b). A genetic model to account for social interactions was first proposed by Griffing (1967) and included not only the direct genetic effect, but also social genetic effects of group mates.
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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-Bouwman_et_al - Maternal and social genetic effects on...

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