Hostname: page-component-586b7cd67f-t7czq Total loading time: 0 Render date: 2024-11-23T05:44:42.776Z Has data issue: false hasContentIssue false
  • English
  • Français

Puberty attainment in oestradiol-treated gilts given allyl-trenbolone and gonadotrophins

Published online by Cambridge University Press:  02 September 2010

M. A. Varley ,
H. Yang  and
R. G. Rodway
M. A. Varley
Affiliation:
Department of Animal Physiology and Nutrition, University of Leeds, Leeds LS2 9JT
H. Yang
Affiliation:
Department of Animal Physiology and Nutrition, University of Leeds, Leeds LS2 9JT
R. G. Rodway
Affiliation:
Department of Animal Physiology and Nutrition, University of Leeds, Leeds LS2 9JT
Get access

Abstract

Sixty Large White ♂ × (Large White ♂ × Landrace ♀) pre-pubertal gilts were allocated at random to one of five treatments. Gilts on treatment A were given oestradiol benzoate (OB) at 160 days of age. They were also given allyl-trenbolone (AT) at 166 days of age for 18 days followed by an injection of gonadotrophins (Gn) at 184 days of age. Gilts on treatment B were given OB and AT, but not Gn. Gilts on treatment C were given OB and Gn, but not AT. Gilts on treatment D were given OB only and gilts on treatment E were given Gn only. Gilts which were in heat after 183 days of age were artificially inseminated twice during the first 2 days of oestrus. All gilts were slaughtered either 20 days after insemination or at 220 days of age if they were still anoestrus.

The percentages of gilts ovulating after Gn injection were 36% (4/11), 91·7% (11/12) and 91·7% (11/12) for treatment groups A, C and E respectively (P < 0·01). Gilts on treatments A, C and E were inseminated at a significantly younger age than those on treatments B and D (P < 0·05). No significant differences were found in ovulation rate or embryo survival between treatments.

The results indicated that the administration of AT prior to Gn injection had an adverse effect on both the percentage of gilts ovulating and the development of embryos.

Type
Papers
Information
Animal Production , Volume 48 , Issue 2 , April 1989 , pp. 435 - 441
Copyright
Copyright © British Society of Animal Science 1989

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

Bielanski, A. 1977. [The possibilities of a reduction in the age at first farrowing.] Zeszyty Problemowe Postepow Nauk Rolnczych, No. 196, pp. 49–54.Google Scholar
Breeuwsma, A. J. 1974. Induction of oestrus and ovulation in prepuberal and anoestrus pigs. 3rd International Congess of the International Pig Veterinary Society, Lyon, pp. G14, 1–5.Google Scholar
Burnett, P. J. and Walker, N. 1986. The effect of boar contact on the maintenance of cyclic activity in gilts after the hormonal induction of puberty. Animal Production 42: 469 (Abstr.).Google Scholar
Dziuk, P. J. and Polge, C. 1965. Fertility in gilts following induced ovulation. Veterinary Record 77: 236–239.Google ScholarPubMed
Fowler, V. R. and Varley, M. A. 1985. Producing once-bred gilts. In Science, Pig and Profits (ed. Hardcastle, J.), pp. 10–11. Agricultural and Food Research Council, London.Google Scholar
Guthrie, H. D. 1977. Induction of ovulation and fertility in prepubertal gilts. Journal of Animal Science 45: 1360–1367.Google Scholar
Hughes, P. E. and Cole, D. J. A. 1978. Reproduction n i the gilt. 3. The effect of exogenous oestrogen on the attainment of puberty and subsequent reproductive performance. Animal Production 27: 11–20.Google Scholar
Hughes, P. E. and Varley, M. A. 1980. Reproduction in the Pig. Butterworths, London.Google Scholar
Nowak, R. and Rodway, R. G. 1985. Effect of intravaginal implants of melatonin on the onset of ovarian activity in adult and prepubertal ewes. Journal of Reproduction and Fertility 74: 287–293.CrossRefGoogle ScholarPubMed
Paterson, A. M. 1982. The controlled induction of puberty. In Control of Pig Reproduction (ed. Cole, D. J. A. and Foxcroft, G. R.), pp. 139–159. Butterworths, London.CrossRefGoogle Scholar
Paterson, A. M. and Day, B. N. 1980. The effect of estradiol benzoate on estrus and ovulation in prepubertal gilts. Journal of Animal Science 51: Suppl. 1, p. 88 (Abstr.).Google Scholar
Paterson, A. M. and Lindsay, D. R. 1981. 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. Animal Production 32: 51–54.Google Scholar
Paterson, A. M., Pearce, G. P., Foxcroft, G. R. and Reed, H. C. B. 1984. Reproductive performance of gilts induced into puberty with oestradiol benzoate or a combination of pregnant mare's serum gonadotropin and human chorionic gonadotropin. Animal Production 38: 121–128.Google Scholar
Polge, C. 1982. Embryo transplantation and preservation. In Control of Pig Reproduction (ed. Cole, D. J. A. and Foxcroft, G. R.), pp. 277–291. Butterworths, London.CrossRefGoogle Scholar
Reed, H. C. B. 1982. Artificial insemination. In Control of Pig Reproduction (ed. Cole, D. J. A. and Foxcroft, G. R.), pp. 65–90. Butterworths, London.CrossRefGoogle Scholar
Stickney, K. 1982. The physiology of oestrogen-induced puberty in the gilt. Ph.D. Thesis, University of Nottingham.Google Scholar
Varley, M. A. 1983. The regulation of oestrous cycles n i groups of post-pubertal female pigs using allyl-trenbolone. Animal Production 36: 211–215.Google Scholar
Varley, M. A., English, P. R., MacPherson, O., Pawley, P. and Davidson, F. M. 1986. The use of allyl-trenbolone or a combination of pregnant mare's serum gonadotropin and human chorionic gonadotropin t o control oestrus and ovulation in groups of peripubertal gilts. Animal Production 42: 448 (Abstr.).Google Scholar
Webel, S. K. and Day, B. N. 1982. The control of ovulation. In Control of Pig Reproduction (ed. Cole, D. J. A. and Foxcroft, G. R.), pp. 197–210. Butterworths, London.Google Scholar
Yang, H., Varley, M. A. and Rodway, R. G. 1987. Effect of allyl-trenbolone on the attainment of puberty i n gilts treated with oestradiol. Animal Production 45: 503–510.Google Scholar