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Comparison of ovarian oestradiol and progesterone secretion, in vitro, between ewe lambs and ewes

Published online by Cambridge University Press:  23 November 2017

M. A. Younes ,
N. F. G. Beck ,
M. T. Rose  and
B. Davies
M. A. Younes*
Affiliation:
Welsh Institute Rural of Science, University of Wales Aberystwyth, Llanbadarn Campus, Llanbadarn Fawr, Ceredigion, SY23 3AL, UK
N. F. G. Beck
Affiliation:
Welsh Institute Rural of Science, University of Wales Aberystwyth, Llanbadarn Campus, Llanbadarn Fawr, Ceredigion, SY23 3AL, UK
M. T. Rose
Affiliation:
Welsh Institute Rural of Science, University of Wales Aberystwyth, Llanbadarn Campus, Llanbadarn Fawr, Ceredigion, SY23 3AL, UK
B. Davies
Affiliation:
Welsh Institute Rural of Science, University of Wales Aberystwyth, Llanbadarn Campus, Llanbadarn Fawr, Ceredigion, SY23 3AL, UK
*
Email: may03@aber.ac.uk
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Extract

Reproductive performance of ewe lambs is lower than that of adult ewes (Quirke 1979). This is mainly the result of preimplantation losses, which can exceed 50% of fertilised eggs. Previous evidence from this laboratory suggests that these losses may be associated with abnormal ovarian hormone production (Davies and Beck 1993). Khan (1999) demonstrated that blood progesterone levels during the oestrous cycle and pregnancy were lower in ewe lambs than in ewes. Furthermore, both progesterone and oestradiol concentrations were lower in ewe lambs, than in ewes, following gonadotrophin stimulation (Khan, Beck and Khalid 1999). These results suggest that ewe lamb corpora lutea and follicles secrete less progesterone and oestradiol, respectively, than those of ewes. The aim of this study was to determine whether there is a difference in vitro steroid hormone production by corpora lutea and follicles, from ewe lambs and ewes.

Type
Poster Presentations
Information
Proceedings of the British Society of Animal Science , Volume 2005 , 2005 , pp. 149
Copyright
Copyright © The British Society of Animal Science 2005

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References

Davies, M. C. G. and Beck, N. F. G. (1993) A comparison of plasma prolactin, LH and progesterone concentrations during oestrus and early pregnancy in ewe lambs and ewes. Animal Production. 57, 281 – 286 Google Scholar
Khan, T. H. 1999. The effects of gonadotrophin supplementation on embryo mortality in ewes and lambs. Thesis. University of Wales, Aberystwyth, UK.Google Scholar
Khan, T. H, Beck, N. F. G. and Khalid, M. 1999. The effects of GnRH or hCG on Day 12 of pregnancy on luteal function in ewes and ewe lambs. Journal of Reproduction and Fertility Abstract Series 23, 58.Google Scholar