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Detection of quantitative trait loci for teat number and female reproductive traits in Meishan × Large White F2 pigs

Published online by Cambridge University Press:  13 May 2008

J. P. Bidanel ,
A. Rosendo ,
N. Iannuccelli ,
J. Riquet ,
H. Gilbert ,
J. C. Caritez ,
Y. Billon ,
Y. Amigues ,
A. Prunier  and
D. Milan
J. P. Bidanel*
Affiliation:
INRA, UR337 Station de Génétique quantitative et appliquée F-78350 Jouy-en-Josas, France
A. Rosendo
Affiliation:
INRA, UR337 Station de Génétique quantitative et appliquée F-78350 Jouy-en-Josas, France
N. Iannuccelli
Affiliation:
INRA, UMR444 Laboratoire de Génétique Cellulaire F-31320 Castanet-Tolosan, France
J. Riquet
Affiliation:
INRA, UMR444 Laboratoire de Génétique Cellulaire F-31320 Castanet-Tolosan, France
H. Gilbert
Affiliation:
INRA, UR337 Station de Génétique quantitative et appliquée F-78350 Jouy-en-Josas, France
J. C. Caritez
Affiliation:
INRA, UE967 Génétique Expérimentale en Productions Animales F-17700 Surgères, France
Y. Billon
Affiliation:
INRA, UE967 Génétique Expérimentale en Productions Animales F-17700 Surgères, France
Y. Amigues
Affiliation:
LABOGENA, F-78350 Jouy-en-Josas, France
A. Prunier
Affiliation:
INRA, UMR1079 Systèmes d’Elevage, Nutrition Animale et Humaine F-35590 Saint-Gilles, France
D. Milan
Affiliation:
INRA, UMR444 Laboratoire de Génétique Cellulaire F-31320 Castanet-Tolosan, France
*
E-mail: jean-pierre.bidanel@jouy.inra.fr
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Abstract

A quantitative trait locus (QTL) analysis of female reproductive data from a three-generation experimental cross between Meishan (MS) and Large White (LW) pig breeds is presented. Six F1 boars and 23 F1 sows, progeny of six LW boars and six MS sows, produced 573 F2 females and 530 F2 males. Six traits, i.e. teat number (TN), age at puberty (AP), ovulation rate (OR), weight at mating (WTM), number of viable embryos (NVE) and embryo survival (ES) at 30 days of gestation were analysed. Animals were genotyped for a total of 137 markers covering the entire porcine genome. Analyses were carried out based on interval mapping methods, using a line-cross (LC) regression and a half–full sib (HFS) maximum likelihood test. Genome-wide (GW) highly significant (P < 0.001) QTL were detected for WTM on SSC 7 and for AP on SSC 13. They explained, respectively, 14.5% and 8.9% of the trait phenotypic variance. Other GW significant (P < 0.05) QTL were detected for TN on SSC 3, 7, 8, 16 and 17, for OR on SSC 4 and 5, and for ES on SSC 9. Two additional chromosome-wide significant (P < 0.05) QTL were detected for TN, three for WTM, four for AP, three for OR, three for NVE and two for ES. With the exception of the two above-mentioned loci, the QTL explained from 1.2% to 4.6% of trait phenotypic variance. QTL alleles were in most cases not fixed in the grand-parental populations and Meishan alleles were not systematically associated with higher reproductive performance.

Keywords

gene mappingquantitative trait locuspigreproduction traitsteat number
Type
Full Paper
Information
animal , Volume 2 , Issue 6 , June 2008 , pp. 813 - 820
Copyright
Copyright © The Animal Consortium 2008

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