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Nutritional stress and pre-implantation embryonic mortality in Merino sheep, 1966

Published online by Cambridge University Press:  27 March 2009

T. N. Edey
T. N. Edey
Affiliation:
Department of Livestock Husbandry, University of New England, Armidale, N.S.W., Australia
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Summary

Mature Merino ewes (108) which had been hand-mated to fertile rams received the following treatments: 1, submaintenance nutrition days 7–14 (34 ewes); 2, submaintenance nutrition days 20–27 (40 ewes); 3, control (34 ewes).

The ewes were in fat condition, and gained weight before mating and throughout pregnancy except when on the submaintenance treatment. Their overall ovulation rate was 180·6%. The percentages of ova not represented by lambs at term were 30·6, 37·5 and 41·0 for groups 1–3 respectively, the differences being non-significant.

Loss of ova in multiple ovulators was not significantly different from that in single ovulators and there was no relationship between body weight and prenatal loss. Nine post-mating oestrous cycles longer than 21 days were distributed through all groups in a pattern which bore no apparent relationship to nutritionally-induced embryo mortality. A higher proportion of ewes remained barren when re-mated after long than after normal-length oestrous cycles.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 74 , Issue 1 , February 1970 , pp. 187 - 192
Copyright
Copyright © Cambridge University Press 1970

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References

REFERENCES

Barcroft, J (1946). Researches on prenatal life. Oxford: Blackwell Scientific Publications.Google Scholar
Casida, L. E., Woody, C. O. & Pope, A. L. (1966). Inequality in function of the right and left ovaries and uterine horns of the ewe. J. Anim. Sci. 25, 1169–71.CrossRefGoogle ScholarPubMed
Cloete, J. H. L. (1939). Prenatal growth in the Merino sheep. Onderst. J. vet. Sci. Anim. Ind. 13, 417–558.Google Scholar
Edey, T. N. (1966). Nutritional stress and pre-implantation embryonic mortality in Merino sheep. J. agric. Sci., Camb. 67, 287–93.CrossRefGoogle Scholar
Edey, T. N. (1970). Nutritional stress and pre-implantation embryonic mortality in Merino sheep. J. agric. Sci., Camb. 74, 181–6.CrossRefGoogle Scholar