Hostname: page-component-848d4c4894-pjpqr Total loading time: 0 Render date: 2024-06-27T18:47:38.458Z Has data issue: false hasContentIssue false
  • English
  • Français

Effect of nutrition and dose level of PMS on oestrous response and ovulation rate in progestagen-treated non-cyclic Suffolk × Galway ewe lambs

Published online by Cambridge University Press:  27 March 2009

M. G. Keane
M. G. Keane
Affiliation:
An Foras Taluntais Grange, Dunsany, Co. Meath, Ireland
Get access Rights & Permissions [Opens in a new window]

Summary

March-born non-cyclic Suffolk × Galway ewe lambs were treated with progestagen pessaries while being either fed fresh-cut grass ad libitum, or restricted to 50% of appetite and at pessary removal half of the animals on each nutritional treatment received either 600 i.u. or 300 i.u. PMS. Averaged over both levels of PMS, 97·5% of the lambs showed oestrus when fed ad libitum but only 67·5% of those on restricted feeding responded. When feed intake was not restricted there were no differences due to PMS level but when feed intake was restricted the higher dose level of PMS resulted in a greater percentage showing oestrus and a significantly higher ovulation rate. The dose level of PMS had no effect on the time of oestrous onset but restricted feeding resulted in delayed onset and poor synchronization of oestrus. Duration of oestrus was greatest for lambs fed ad libitum given 600 i.u. PMS and least for those on restricted feeding given 300 i.u. PMS but the difference was not significant. A minority of lambs showed broken oestrous periods.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 84 , Issue 3 , June 1975 , pp. 507 - 511
Copyright
Copyright © Cambridge University Press 1975

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

Allen, D. M. & Lamming, G. E. (1961 a). Nutrition and reproduction in the ewe. Journal of Agricultural Science, Cambridge 56, 69–79.CrossRefGoogle Scholar
Allen, D. M. & Lamming, G. E. (1961 b). Some effects of nutrition on the growth and sexual development of ewe lambs. Journal of Agricultural Science, Cambridge 57, 87–95.CrossRefGoogle Scholar
Bellows, R. A., Pope, A. L., Meyeb, R. K., Chapman, A. B. & Casida, L. E. (1963). Physiological mechanisms in nutritionally induced differences in ovarian activity of mature ewes. Journal of Animal Science 22, 93–100.CrossRefGoogle Scholar
Gordon, I. (1958 a). The use of progesterone and serum gonadotrophin (PMS) in the control of fertility in sheep. II. Studies in the extra-seasonal production of lambs. Journal of Agricultural Science, Cambridge 50, 152–97.CrossRefGoogle Scholar
Gordon, I. (1958 b). The use of progesterone and serum gonadotrophin (PMS) in the control of fertility in sheep. I. The hormonal augmentation of fertility in the ewe during the breeding season. Journal of Agricultural Science, Cambridge 50, 123–51.CrossRefGoogle Scholar
Gordon, I. (1963). The induction of pregnancy in the anoestrous ewe by hormonal therapy. II. Progesterone- pregnant mare's serum applications in anoestrus. Journal of Agricultural Science, Cambridge 60, 43–66.CrossRefGoogle Scholar
Gordon, I. (1971). Control of reproduction in sheep: Towards programmed lamb production. Department of Agriculture and Fisheries Journal, Dublin 68, 27–75.Google Scholar
Gordon, I. (1973). Recent progress in controlled breeding in sheep. World Review of Animal Production 9, 19–33.Google Scholar
Gunn, R. G., Doney, J. M. & Russel, A. J. F. (1969). Fertility in Scottish Blackface ewes as influenced by nutrition and body condition at mating. Journal of Agricultural Science, Cambridge 73, 289–94.CrossRefGoogle Scholar
Hunter, G. L. (1964). The effects of season and mating on oestrus and fertility in the ewe. Proceedings of South African Society of Animal Production 3, 196–206.Google Scholar
Jennings, J. J. (1972). Some factors affecting the reproductive performance of rams. Ph.D. Thesis, National University of Ireland, Dublin, 1972.Google Scholar
Joyce, M. J. B. (1972). A comparison of three mating systems in ewes treated with intravaginal (Sc 9880/progesterone) progestagen and PMS. Proceedings VIIth International Congress on Animal Reproduction and Artificial Insemination, vol. 2, pp. 937–8 (Munich, 1972).Google Scholar
Keane, M. G. (1973). Effects of body condition and level of nutrition on the response of ewes to hormone treatment in the non–breeding season. Irish Journal of Agricultural Research 12, 229–37.Google Scholar
Keane, M. G. (1974 a). Effect of progestagen-PMS hormone treatment on reproduction in ewe lambs. Irish Journal of Agricultural Research 13, 39–48.Google Scholar
Keane, M. G. (1974 b). Effect of body weight on attainment of puberty and reproductive performance in Suffolk × ewe lambs. Irish Journal of Agricultural Research 13, 263–74.Google Scholar
Keane, M. G. (1974 c). Effect of 17β oestradiol pretreatment and system of mating on the reproductive performance of progestagen-PMS treated non-cyclic ewe lambs. Irish Journal of Agricultural Research (in the Press).Google Scholar
Newton, J. E. & Betts, J. E. (1966). Factors affecting litter size in the Scotch half-bred ewe. I. Treatment with PMS and progesterone. Journal of Reproduction and Fertility 12, 167–75.CrossRefGoogle Scholar
Palsson, H. (1962). Augmentation of fertility of Iceland ewes with PMS in successive years. Journal of Reproduction and Fertility 3, 55–63.CrossRefGoogle Scholar
Parsons, S. D. & Hunter, G. L. (1967). Effect of the ram on duration of oestrus in the ewe. Journal of Reproduction and Fertility 14, 61–70.CrossRefGoogle Scholar
Robinson, T. J. (1951). The control of fertility in sheep. II. The augmentation of fertility by gonadotrophin treatment of the ewe in the normal breeding season. Journal of Agricultural Science, Cambridge 41, 6–63.CrossRefGoogle Scholar
Tait, R. M. (1971). Influence of nutritional status on hormone induced superovulation in normally cycling ewes. Canadian Journal of Animal Science 51, 771–5.CrossRefGoogle Scholar
Thimonier, J., Mauleon, P., Cognie, Y. and Ortavant, R. (1968). Déclenchement de l'oestrus et obtention précoce de gestations chez des agnelles à l'aide d'éponges vaginales impregnées d'acétate de fluorogestone. Annales de Zootechnie 17, 275–88.CrossRefGoogle Scholar