Hostname: page-component-745bb68f8f-f46jp Total loading time: 0 Render date: 2025-01-07T12:19:26.333Z Has data issue: false hasContentIssue false
  • English
  • Français

Inheritance of teat number and teat inversion in pigs

Published online by Cambridge University Press:  02 September 2010

G. A. Clayton ,
J. C. Powell  and
P. G. Hiley
G. A. Clayton
Affiliation:
Department of Genetics, University of Edinburgh, Edinburgh EH9 3JN
J. C. Powell
Affiliation:
Cotswold Pig Development Co. Ltd, Rothwell, Lincoln LN7 6BJ
P. G. Hiley
Affiliation:
Cotswold Pig Development Co. Ltd, Rothwell, Lincoln LN7 6BJ
Get access

Abstract

Total teat number in a Large White and a British Landrace population had a modal number of 14. The trait was highly leptokurtic, indicated by the fact that 086 of the population falls within one standard deviation of the mean. There was no sex difference in total teat number, although a small but significant breed difference existed. Heritability of the trait was low, of the order of 0·10 to 0·20 based on the sire component of variance. Larger dam terms suggested a maternal effect.

Severely inverted teats (nipple invisible) were observed in 0·17 of gilts. Mean number of inversions was 0·738 in the entire population but 4·01 in affected gilts. The heritability of the trait was of the order of 0·20 and a maternal component was possibly involved.

Inverted teats are not distributed at random. They occur most frequently in the umbilical and anterior regions and diminish sharply in frequency towards the rear. In this study 0·97 of all affected pigs had one or more inverted teats in the umbilical and anterior regions.

Type
Research Article
Information
Animal Production , Volume 33 , Issue 3 , December 1981 , pp. 299 - 304
Copyright
Copyright © British Society of Animal Science 1981

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Brascamp, E. W., Cop, W. A. G. and Buiting, G. I. J. 1979. Evaluation of six lines of pigs for crossing. 1. Reproduction and fattening in pure breeding. Z. Tierzücht. ZuchtBiol. 96: 160–169.CrossRefGoogle Scholar
Done, J. T. 1980. Teat deficiencies in pigs. Vet. A. 20: 246–254.Google Scholar
Enfield, F. D. and Rempel, W. E. 1961. Inheritance of teat number and relationship of teat number to various maternal traits in swine. J. Anim. Sci. 20: 876–879.CrossRefGoogle Scholar
Fahmy, M. H. and Bernard, C. 1970. Genetic and phenotypic study of pre- and post-weaning weights and gains in swine. Can. J. Anim. Sci. 50: 593–599.CrossRefGoogle Scholar
Hanset, R. and Camerlynck, R. 1974. L'heritabilite du nombre de mamelles chez le pore de Piétrain et le pore Landrace Beige. Annals Génét. Sei. Anim. 6: 91–102.CrossRefGoogle Scholar
Molinat, M. and Thibault, B. 1977. Heritabilite du nombre de fausses tetines chez la truie. Journées Reck Porcine France, pp. 69–73.Google Scholar
Nordby, J. E. 1934. Congenital defects in the mammae of swine. J. Hered. 25: 499–502.CrossRefGoogle Scholar
Roy, G. L., Boylan, W. J. and Seale, M. E. 1968. Estimates of genetic correlations among certain carcass and performance traits in swine. Can. J. Anim. Sci. 48: 1–6.CrossRefGoogle Scholar
Skjervold, H. 1963. Inheritance of teat number in swine and the relationship to performance. Ada Agric. scand. 13: 323–333.CrossRefGoogle Scholar
Webb, A. J. 1974. A sire-line of pigs. Ph.D. Thesis, Univ. Edinb.Google Scholar
Wilham, R. L. and Whatley, J. A. 1963. Genetic variation in nipple number in swine. Z. Tierzücht. Züchl Biol. 78: 350–363.CrossRefGoogle Scholar