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The effect of melatonin treatment in combination with progestagen pessaries on reproductive performance of ewes during the anoestrous period

Published online by Cambridge University Press:  02 September 2010

V. Laliotis ,
A. Vosniakou ,
A. Lymberopoulos ,
J. M. Doney  and
S. Kouimtzis
V. Laliotis
Affiliation:
National Agricultural Research Foundation, Institute of Reproduction and Artificial Insemination, 570 08 Ionia, Thessaloniki, Greece
A. Vosniakou
Affiliation:
National Agricultural Research Foundation, Institute of Reproduction and Artificial Insemination, 570 08 Ionia, Thessaloniki, Greece
A. Lymberopoulos
Affiliation:
National Agricultural Research Foundation, Institute of Reproduction and Artificial Insemination, 570 08 Ionia, Thessaloniki, Greece
J. M. Doney
Affiliation:
National Agricultural Research Foundation, Institute of Reproduction and Artificial Insemination, 570 08 Ionia, Thessaloniki, Greece
S. Kouimtzis
Affiliation:
National Agricultural Research Foundation, Institute of Reproduction and Artificial Insemination, 570 08 Ionia, Thessaloniki, Greece
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Abstract

The objective of this study was to compare the effects of melatonin implants combined with intravaginal, progestagen-impregnated pessaries with the conventional treatment of progestagen pessaries followed by pregnant mare serum gonadatrophin (PMSG) on the reproductive performance of ewes during the anoestrous period.

A commercial flock of 179 seasonally anoestrous Chios crossbred ewes was used. The ewes within the flock were randomly allocated to one of two groups. Ewes of group MP (melatonin + pessaries) received melatonin implants on 20 March (50 days before the target breeding date of 10 May) and were treated with intravaginal progestagen pessaries 35 days later (25 April). Ewes of group PP (pessaries + PMSG) were also treated with pessaries on 25 April. After 14 days the pessaries were removed from both groups and 500 i.u. PMSG was injected (i.m.) into ewes of group PP only. Fertile rams were introduced into both groups 24 h after sponge removal. Pregnancy rate and litter size were determined by ultrasound scanning 80 days after ram introduction.

Pregnancy rate at first oestrus was significantly higher in group MP than in group PP (57 v. 40%, P < 0·05). The overall conception rate during two oestrous cycles was significantly higher in group MP than in group PP (78 v. 59%, P < 0·02). The groups did not differ significantly in the mean number of foetuses per pregnant ewe that conceived during the first or second oestrus after pessary removal (1·78 and 1·87, respectively). The total number of foetuses per treated ewe was higher in group MP than in group PP (1·39 v. 1·10) as a consequence of the difference in pregnancy rate.

Keywords

anoestrusewesmelatoninpregnancy rateprogesterone
Type
Research Article
Information
Animal Science , Volume 65 , Issue 1 , August 1997 , pp. 71 - 74
Copyright
Copyright © British Society of Animal Science 1997

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References

Cognie, Y. and Mauleon, F. 1983. Control of reproduction in the ewe. In Sheep production (ed. Haresign, W.), pp. 381–392. Butterworths, London.Google Scholar
Evans, G. and Robinson, T. J. 1980. The control of fertility in sheep: endocrine and ovarian responses to progestagen — PMSG treatment in the breeding season and in anoestrus. Journal of Agricultural Science, Cambridge 93: 69–88.CrossRefGoogle Scholar
Hamra, A. H., McNally, J. W., Marcek, J. M., Carlson, K. M. and Wheaton, J. E. 1989. Comparison of progesterone sponges, cronolone sponges and controlled internal drug release dispensers on fertility in anoestrous ewes. Animal Reproduction Science 18:219–226.CrossRefGoogle Scholar
Haresign, W. 1992. The effect of implantation of lowland ewes with melatonin on the time of mating and reproductive performance. Animal Production 54: 31–39.Google Scholar
Kouimtzis, S. A., Belibasaki, S. and Doney, J. M. 1989. Melatonin advances and condenses the onset of seasonal breeding in Greek dairy ewes. Animal Production 48: 399–405.Google Scholar
Kouimtzis, S., Davies, P., Doney, J. and Laliotis, V. 1994. The effect of melatonin on seasonal breeding in commercial flocks of Greek dairy sheep. Živočišná Vyroba 39: 689–697.Google Scholar
Laliotis, V., Vosniakou, A. G., Doney, J. M. and Batsios, C. A. 1994. The efficiency of AI or natural service after oestrus synchronisation in sheep of North Greece. World Review of Animal Production 28: 72–79.Google Scholar
Rajkumar, R. R., Argo, C. M. and Rodway, A. G. 1989. Fertility of ewes given either melatonin or progestagen sponges. Veterinary Record 124:215–217.CrossRefGoogle ScholarPubMed
Robinson, T. J. 1968. The synchronization of the oestrous cycle and fertility. Proceedings of the sixth congrès international de reproduction animale et insémination artificielle, vol. II, pp. 1347–1382.Google Scholar
Staples, L. D., McPhee, S. R., Kennaway, D. J. and Williams, A. H. 1992. The influence of exogenous melatonin on the seasonal patterns of ovulation and oestrus in sheep. Animal Reproduction Science 30:185–222.CrossRefGoogle Scholar
Thimonier, J. 1979. Hormonal control of oestrous cycle in the ewe. Livestock Production Science 6: 39–50.CrossRefGoogle Scholar
Vlachos, K., Karagiannidis, A. and Koutsouris, C. 1967. Research on oestrus synchronization in sheep by using the preparation Cronolone SC-9880. Bulletin of the Physiology of Reproduction and Artificial Insemination 3:3–11.Google Scholar
Vlachos, K., Koutsouris, C. and Paschaleris, E. 1968. Research in oestrus synchronization in sheep by using the ’Synchro-Mate“ and ’Spongosan“ preparations. Bulletin of the Physiology of Reproduction and Artificial Insemination 5: 129–140Google Scholar
Vosniakou, A. G., Doney, J. M. and Tsakalof, P. 1989. A note on the seasonal oestrous period in three breeds of Greek dairy sheep. Animal Production 49:147–150.Google Scholar
Wheaton, J. E., Pohl, H. A. and Windels, H. F. 1990. Effects of melatonin and progesterone administered to ewes in spring and summer. Journal of Animal Science 68:923–930.CrossRefGoogle ScholarPubMed