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Evaluation of genetic markers for litter size in Meishan synthetic and Large White pigs

Published online by Cambridge University Press:  05 November 2021

O.I. Southwood ,
S. Hoste ,
T.H. Short ,
A.J. Mileham  and
D. Cuthbert-Heavens
O.I. Southwood
Affiliation:
PIC Europe, Fyfield Wick, Abingdon, Oxon, OX13 5NA, UK
S. Hoste
Affiliation:
PIC UK, Fyfield Wick, Abingdon, Oxon, OX13 5NA, UK
T.H. Short
Affiliation:
PIC USA, PO Box 348, 3033 Nashville Road, Franklin, Kentucky 42134, USA
A.J. Mileham
Affiliation:
DFTC Cambridge, CB1 2JN, UK
D. Cuthbert-Heavens
Affiliation:
DFTC Cambridge, CB1 2JN, UK
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Extract

A significant relationship between the oestrogen receptor gene (ESR) and litter size has been detected in USA populations of Large White and a synthetic comprising 50% Meishan (Rothschild et al., 1995). Animals carrying two copies of the favourable allele (B) had an extra pig born per litter than those that did not have the allele. This paper reports on results observed in a UK 50% Meishan synthetic and four UK Large White lines.

Litter size data from 50% Meishan synthetic (L93) full-sib females where more than one ESR genotype was segregating. Data were analysed using a mixed model with full relationships and including the fixed effects of season of farrowing, parity, ESR genotype (AA, AB or BB) and service type (AI or natural service). Heritiability and permanent environmental effects for litter size were assumed as 0.09 and 0.11, repectively. A total of 27 full-sib families were represented and included 62 sows and 139 litter records. Hypothesis testing used the option in PEST under a mixed model (Groeneveld et al., 1991).

Type
Genetics
Information
Proceedings of the British Society of Animal Science , Volume 1996 , March 1996 , pp. 18
Copyright
Copyright © The British Society of Animal Science 1996

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References

Groeneveld, E., Bunge, R., Wang, T., Fernando, R. (1991). Hypothesis testing in multivariate mixed models and its implications in PEST. 42nd Annual Meeting of EAAP Google Scholar
Rothschild, M., Jacobson, C., Vaske, D., Tuggle, C., Wang, L., Short, T., Eckardt, G., Sasaki, S., Vincent, A., McLaren, D., Southwood, O., van der Steen, H., Mileham, A., Plastow, G. (1995). The Estrogen Receptor is associated with a major gene influencing litter size in pigs. Proc. Natl. Acad. Sci. USA(submitted)Google Scholar