Hostname: page-component-7bb8b95d7b-2h6rp Total loading time: 0 Render date: 2024-09-23T23:15:46.584Z Has data issue: false hasContentIssue false
  • English
  • Français

A note on the effect on puberty in gilts of exposure to a boar between 140 and 160 days of age

Published online by Cambridge University Press:  02 September 2010

J. S. Walton
J. S. Walton
Affiliation:
Department of Animal and Poultry Science, University of Guelph, Guelph, Ontario N1G 2W1, Canada
Get access

Abstract

Groups of five Yorkshire ♂ x Landrace ♀ gilts were either exposed (BE) or not exposed (NE) to a mature boar commencing at 140, 147, 154 or 161 days of age. Each group of BE gilts was slaughtered 10 days after initial boar exposure, for examination of the reproductive tract, with one of the four NE groups killed at a corresponding age.

NE gilts remained prepubertal throughout. Boar exposure induced ovulation in one gilt at 140 days, two gilts at 147 days, two gilts at 154 days and one gilt at 161 days. Boar exposure also increased uterine weight (P < 0·001). There were no effects of age either on the number of gilts ovulating or on uterine weight. There was a significant positive effect of body weight on uterine weight which was greater in BE gilts than in NE gilts. These results suggest that body weight may be a determinant of the response to boar exposure by gilts between 140 and 170 days of age.

Type
Research Article
Information
Animal Production , Volume 41 , Issue 1 , August 1985 , pp. 127 - 129
Copyright
Copyright © British Society of Animal Science 1985

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

Brooks, P. H. and Cole, D. J. A. 1970. The effect of the presence of a boar on the attainment of puberty in gilts. J. Reprod. Pert. 23: 435–440.CrossRefGoogle ScholarPubMed
Helwig, J. T. and Council, K. A. 1979. SAS User's Guide. Statistical Analysis Systems Institute, Raleigh, NC.Google Scholar
Hughes, P. E. 1982. Factors affecting the natural attainment of puberty in the gilt. In Control of Pig Reproduction (ed. Cole, D. J. A. and Foxcroft, G. R.), pp. 117–138. Butterworth, London.CrossRefGoogle Scholar
Kirkwood, R. N. and Hughes, P. E. 1979. The influence of age at first boar contact on puberty attainment in the gilt. Anim. Prod. 29: 231–238.Google Scholar
Kirkwood, R. N. and Hughes, P. E. 1980. A note on the influence of boar effect component stimuli on puberty attainment in the gilt. Anim. Prod. 31: 209–211.Google Scholar
Kirkwood, R. N., Hughes, P. E. and Booth, W. D. 1983. The influence of boar-related odours on puberty attainment in gilts. Anim. Prod. 36: 131–136.Google Scholar
Paterson, A. M. and Lindsay, D. R. 1980. Induction of puberty in gilts. 1. The effects of rearing conditions on reproductive performance and response to mature boars after early puberty. Anim. Prod. 31: 291–297.Google Scholar
Thompson, L. H. and Savage, I. S. 1978. Age at puberty and ovulation rate in gilts in confinement as influenced by exposure to a boar. J. Anim. Sci. 47: 1141–1144.CrossRefGoogle ScholarPubMed
Walton, J. S. 1984. A note on the effect of exposure to a boar on the development of the reproductive system of immature gilts. Anim. Prod. 39: 483–486.Google Scholar