Hostname: page-component-cd9895bd7-gvvz8 Total loading time: 0 Render date: 2024-12-26T13:56:33.011Z Has data issue: false hasContentIssue false
  • English
  • Français

Induction of puberty in gilts 2. The effect of boars on maintenance of cyclic activity in gilts induced to ovulate with pregnant mare's serum gonadotrophin and human chorionic gonadotrophin

Published online by Cambridge University Press:  02 September 2010

A. M. Paterson  and
D. R. Lindsay
A. M. Paterson
Affiliation:
Department of Animal Science and Production, University of Western Australia, Nedlands, Western Australia 6009, Australia
D. R. Lindsay
Affiliation:
Department of Animal Science and Production, University of Western Australia, Nedlands, Western Australia 6009, Australia
Get access

Abstract

In two experiments prepubertal gilts were injected with a combination of 400 international units pregnant mare's serum gonadotrophin and 200 international units human chorionic gonadotrophin. The gilts were housed either in contact with or isolated from mature boars. Data were obtained of ovarian activity determined immediately after gonadotrophin treatment and at the anticipated time of the second oestrus.

All treated gilts ovulated in response to the treatment and 83% displayed oestrus. Ovulation rate varied both within and between experiments, in experiment 1 the range being 7 to 19 corpora lutea and in experiment 2, between 5 to >30 corpora lutea. Four distinct types of behaviour were observed at the time of the second cycle: ovulation associated with oestrus; ovulation without oestrus; oestrus but no ovulation; and a return to a prepubertal state with no oestrus or ovulation. The presence of boars enhanced the maintenance of cyclic activity. Overall, more gilts displayed a second oestrus (33/39 v. 19/41, X2 = 11·2, P<0·001), and more had a second ovulation (32/39 v. 24/41, X2=4·2, P<0·05) when boars were run with the gilts.

Type
Research Article
Information
Animal Production , Volume 32 , Issue 1 , February 1981 , pp. 51 - 54
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

Baker, R. D. and Coggins, E. G. 1966. Induced ovulation and fertility in immature gilts. J. Anim. Sci. 25: 918 (Abstr.).Google Scholar
Bronson, F. H. 1975. Male-induced precocial puberty in female mice: confirmation of the role of estrogen. Endocrinology 96: 511–514.CrossRefGoogle ScholarPubMed
Bronson, F. H. and Desjardins, C. 1974. Circulating concentrations of FSH, LH, estradiol, and progesterone associated with acute, male-induced puberty in female mice. Endocrinology 94: 1658–1668.CrossRefGoogle ScholarPubMed
Bronson, F. H. and Maruniak, J. A. 1976. Differential effects of male stimuli on follicle-stimulating hormone, luteinizing hormone, and prolactin secretion in prepubertal female mice. Endocrinology 98: 1101–1108.CrossRefGoogle ScholarPubMed
Brooks, P. H. and Cole, D. J. A. 1969. The effect of boar presence on the age at puberty of gilts. Rep. Sch. Agric. Univ. Nott., pp. 74–77.Google Scholar
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. Fert. 23: 435–440.CrossRefGoogle ScholarPubMed
Chesworth, J. M. and Tait, A. 1974. A note on the effect of the presence of rams upon the amount of luteinizing hormone in the blood of ewes. Anim. Prod. 19: 107–110.Google Scholar
Dziuk, P. J. and Baker, R. D. 1962. Induction and control of ovulation in swine. J. Anim. Sci. 31: 697–699.CrossRefGoogle Scholar
Guthrie, H. D. 1977. Induction of ovulation and fertility in prepuberal gilts. J. Anim. Sci. 45: 1360–1367.CrossRefGoogle ScholarPubMed
Martin, G. B., Oldham, C. M. and Lindsay, D. R. 1980. Increased plasma LH levels in seasonally anovular Merino ewes following the introduction of rams. Anim. Reprod. Sci. 3: 125–132.CrossRefGoogle Scholar
Paterson, A. M. and Lindsay, D. R. 1980. Inductio n 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
Paterson, A. M. and Oldham, C. M. 1978. Laparoscopic examination of the reproductive tract of gilts using a special crate. Aust. vet. J. 54: 34–36.CrossRefGoogle ScholarPubMed
Schilling, E. and Cerne, F. 1972. Induction and synchronisation of oestrus in prepuberal gilts and anoestrous sows by a PMS/HCG-compound. Vet. Rec. 91: 471–474.CrossRefGoogle ScholarPubMed