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Influence of some sow characteristics on within-litter variation of piglet birth weight*

Published online by Cambridge University Press:  01 December 2008

H. Quesnel ,
L. Brossard ,
A. Valancogne  and
N. Quiniou
H. Quesnel*
Affiliation:
INRA, UMR 1079, F-35000 Rennes, France Agrocampus Rennes, UMR 1079, F-35000 Rennes, France
L. Brossard
Affiliation:
INRA, UMR 1079, F-35000 Rennes, France Agrocampus Rennes, UMR 1079, F-35000 Rennes, France
A. Valancogne
Affiliation:
INRA, UMR 1079, F-35000 Rennes, France Agrocampus Rennes, UMR 1079, F-35000 Rennes, France
N. Quiniou
Affiliation:
IFIP-Institut du Porc, BP 35104, 35651 Le Rheu Cedex, France
*
E-mail: Helene.Quesnel@rennes.inra.fr
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Abstract

Within-litter variation of piglet birth weight (BW0) is associated with an increased piglet mortality and a high variability in pig weight at weaning and weight or age at slaughter. Data collected in two experimental herds were used to quantify within-litter variability in BW0 and to assess the influence of factors mainly related to the sow. Within 24 h after birth, piglets born alive were individually weighed and stillborn piglets were collectively (first data set) or individually (second data set) weighed. The first data set was restricted to litters with no or only one stillborn piglet (3338 litters). It was used to assess the influence of genetic selection on BW0 variation by comparing litter characteristics before (1994 to 1996) and after (2001 to 2004) the development of hyperprolific sows in this herd. The second data set included all litters (n = 1596) from sows born between 2000 and 2004. For each litter, mean BW0 (mBW0) and its coefficient of variation (CVBW0) were calculated. Then, variance analyses were performed to test the influence of litter size, parity, year of sow birth and season at conception. Prolificacy improvement was associated with an increased CVBW0 in litters from pure Large White (LW) and Landrace × Large White (LR × LW) crossbred sows. The CVBW0 averaged 21% and was significantly influenced by litter size and parity. It increased from 15% to 24% when litter size varied from less than 10 piglets to more than 15 piglets. The proportion of small piglets (i.e. weighing less than 1 kg) increased concomitantly. The CVBW0 was not repeatable from a parity to the following. It was lowest for first and second parities (20%) and thereafter increased progressively. The CVBW0 was positively related to sow’s backfat thickness gain during gestation. Taking into account litter size, parity, year of sow birth and season at conception explained 20% of BW0 variation. Thus, major part of heterogeneity is due to other factors, presumably including embryo genotype, on the one hand, and factors that influence embryo and foetus development, such as epigenetic factors, on the other hand.

Keywords

birth weightpigletsowwithin-litter variation
Type
Full Paper
Information
animal , Volume 2 , Issue 12 , December 2008 , pp. 1842 - 1849
Copyright
Copyright © The Animal Consortium 2008

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Footnotes

*

Part of these results was presented at the EAAP meeting (58th meeting of the European Association for Animal Production, Dublin, Ireland, 26 to 29 August 2007).

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