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Milk progesterone profiles during anoestrus through to pregnancy in Greek dairy goats (Capra prisca): the effect of melatonin treatment and male introduction

Published online by Cambridge University Press:  02 September 2010

S. Belibasaki ,
D. Zygoyiannis ,
P. Davies  and
J. M. Doney
S. Belibasaki
Affiliation:
Institute for Reproduction and Artificial Insemination, 54008 Ionia, Macedonia, Greece
D. Zygoyiannis
Affiliation:
Department of Animal Husbandry, Faculty of Veterinary Medicine, Aristotelian University, Thessaloniki, Macedonia, Greece
P. Davies
Affiliation:
Schering Agrochemicals Ltd, Chesterford Park, Saffron Walden, Essex CB10 1XL
J. M. Doney
Affiliation:
Institute for Reproduction and Artificial Insemination, 54008 Ionia, Macedonia, Greece
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Abstract

Two groups of 10 lactating does were housed separately, in isolation from bucks. Does in one group (T) were implanted with melatonin; the second group (U) were not implanted. After 30 days, five implanted and five non-implanted bucks were introduced, singly, into both groups of females each day. Subsamples of milk were taken from the daily output of each doe on 3 days each week for progesterone analysis.

Mean milk progesterone concentration during anoestrus varied significantly amongst individuals (P < 0·001), but the difference between T and U groups was not significant (1·51 and 1·93 (s.e.d. 0·52) μg/l, respectively). Elevated progesterone levels, indicative of a short oestrous cycle and commencing days 2 to 5 after male exposure, were observed in most does. Mean progesterone concentrations were 9·9 and 9·6 (s.e.d. 1·32) μg/l in T and U does respectively. Most does showed a second short cycle starting at 12 to 18 days, (mean concentration 8·4 and 10·6 (s.e.d. 1·64) ng/l, respectively). Untreated does then returned to anoestrus until mated at 63·1 (s.e. 0·94) days after male introduction. In contrast, T does either became pregnant or had a normal oestrous cycle, followed by a repeat cycle or pregnancy (mean onset 21·7 (s.e. 2·22) days after male introduction). The mean time of effective mating for group T does was 37·3 (s.e. 5·91) days, 26 days earlier than for U does (P < 0·001). Mean progesterone concentration in early pregnancy was 65·7 (s.e. 5·78) and 67·6 (s.e. 5·41) μg/l in T and U does, respectively. Males did not become sexually active until after the onset of luteal activity in the females, although treated males were earlier than untreated. There were no significant differences in lactation pattern associated with the progesterone profiles in the two groups.

The introduction of males during late anoestrus initiates short luteal cycles. Only those does closest to onset of the breeding season, in this case induced by melatonin, continue to cycle normally and mating success may require early stimulation of sexual activity in males.

Keywords

goatsmale effectmelatoninoestrus/progesterone
Type
Research Article
Information
Animal Production , Volume 56 , Issue 3 , June 1993 , pp. 333 - 339
Copyright
Copyright © British Society of Animal Science 1993

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References

Bauernfeind, M. and Holtz, W. 1991. Progesterone and estrogen levels in serum of cycling does measured by enzyme immunoassay. Small Ruminant Research 6: 95–102.Google Scholar
Chemineau, P. 1987. Possibilities for using bucks to stimulate ovarian and oestrous cycles in anovulatory goats — a review. Livestock Production Science 17: 135–147.CrossRefGoogle Scholar
Martin, G. B., Oldham, C. M., Cognie, Y. and Pearce, D. T. 1986. The physiological responses of anovulatory ewes to the introduction of rams — a review. Livestock Production Science 15: 219–247.CrossRefGoogle Scholar
McPhee, S., McGregor, B., Williams, A., Ayton, B. B. and Staples, L. 1989. Induction of an earlier joining and an improvement of kidding percentage by use of melatonin implants in Angora does. Proceedings of Australian Society of Reproductive Biology 19: 24 (abstr.)Google Scholar
Restall, B. J. 1990. Reproduction in Australian goats. In Scottish cashmere (ed. Russel, A. J. F.). The Scottish Cashmere Producers Association.Google Scholar
Thibier, M., Pothelet, D., Jeanguyot, N. and De Montigny, G. 1981. Estrous behaviour, progesterone in peripheral plasma and milk in dairy goats at the onset of the breeding season. Journal of Dairy Science 64: 513–519.CrossRefGoogle ScholarPubMed
Van de Wiel, D. F. M., Eldik, J. van, Koops, W., Postma, A. and Oldenbroek, J. K. 1978. Fertility control in cattle by use of the milk progesterone test. Tijdschrift voor Diergeneeskunde 103: 91–103.Google ScholarPubMed
Voller, A., Bidwell, D. E. and Bartlett, A. 1976. Enzyme immunoassays in diagnostic medicine. Theory and practice. Bulletin of World Health Organisation 53: 55–65.Google ScholarPubMed
Zygoyiannis, D., Davies, P. and Doney, J. M. 1993. The effect of melatonin on seasonal reproduction of indigenous and crossbred dairy goats in Greece. Animal Production In press.Google Scholar
Zygoyiannis, D., Davies, P. and Doney, J. M. 1993. The beginning of the breeding season. Animal Production 49: 291–297.Google Scholar