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A study of relationships of breed, time of mating, level of nutrition, live weight, body condition, and face cover to embryo survival in ewes

Published online by Cambridge University Press:  27 March 2009

I. A. Cumming ,
M. A. de B. Blockey ,
C. G. Winfield ,
R. A. Parr  and
A. H. Williams
I. A. Cumming
Affiliation:
Department of Agriculture, S.S. Cameron Laboratory, Werribee, Victoria, 3030
M. A. de B. Blockey
Affiliation:
Department of Agriculture, S.S. Cameron Laboratory, Werribee, Victoria, 3030
C. G. Winfield
Affiliation:
Department of Agriculture, S.S. Cameron Laboratory, Werribee, Victoria, 3030
R. A. Parr
Affiliation:
Department of Agriculture, S.S. Cameron Laboratory, Werribee, Victoria, 3030
A. H. Williams
Affiliation:
Department of Agriculture, S.S. Cameron Laboratory, Werribee, Victoria, 3030
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Summary

Embryo survival was studied in flocks of 500 Saxon Merino and 500 Border Leicester × Merino ewes introduced to rams in either summer or autumn. The ewes were fed 200, 100 or 25% of a maintenance diet from day 2 to day 16 after mating. Embryo survival was greatest in ewes fed the maintenance diet. There was no suggestion that live weight, face cover or condition score were important factors affecting embryo survival. Embryo survival in the twin ovulating cross-breds was higher than in the twin ovulating Merinos, but there was no significant difference in embryo survival in ewes with single ovulations. Embryo survival in ewes with twin ovulations was significantly higher at the autumn mating than in summer.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 84 , Issue 3 , June 1975 , pp. 559 - 565
Copyright
Copyright © Cambridge University Press 1975

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References

REFERENCES

Bennett, D., Axelsen, A. & Chapman, H. W. (1964). The effect of nutritional restriction during early pregnancy on numbers of lambs born. Proceedings of the Australian Society of Animal Production 5, 70–1.Google Scholar
Bennett, D., Nadin, J. B. & Axelsen, A. (1970). The effect of under-nutrition during early pregnancy in Merino ewes. Proceedings of the Australian Society of Animal Production 8, 362–5.Google Scholar
Blockey, M. A. DeB., Cumming, I. A. & Baxter, R. W. (1974). The effect of short term fasting on early embryonic survival in ewes. Proceedings of the Australian Society of Animal Production 10, 265–9.Google Scholar
Cockrem, F. (1966). Studies of face cover in the New Zealand Romney Marsh sheep. II. The measurement of face cover and of factors associated with differences in face grades. Australian Journal of Agricultural Research 17, 975–87.CrossRefGoogle Scholar
Cockrem, F., Barton, R. A. & Rae, A. L. (1956). Face cover in Romney sheep. Proceedings of the New Zealand Society of Animal Production 16, 59–65.Google Scholar
Coop, I. E. (1962). Liveweight-productivity relationships in sheep. I. Liveweight and reproduction. New Zealand Journal of Agricultural Research 5, 249–64.CrossRefGoogle Scholar
Cumming, I. A. (1972 a). The effects of increasing and decreasing liveweight on ovulation and embryonic survival in the Border Leicester x Merino ewe. Proceedings of the Australian Society of Animal Production 9, 192–8.Google Scholar
Cumming, I. A. (1972 b). The effect of nutritional restriction on embryonic survival during the first three weeks of pregnancy in the Perendale ewe. Proceedings of the Australian Society of Animal Production 9, 199–203.Google Scholar
Cumming, I. A. & McDonald, M. F. (1970). Embryo survival in mature Romney ewes relative to live weight and face cover. New Zealand Journal of Agricultural Research 13, 372–84.CrossRefGoogle Scholar
El-Sheikh, A. S., Hulet, C. V., Pope, A. L. & Casida, L. E. (1955). The effect of level of feeding on the reproductive capacity of the ewe. Journal of Animal Science 14, 919–29.CrossRefGoogle Scholar
Edey, T. N. (1966). Nutritional stress and pre-implantation embryonic mortality in Merino sheep. Journal of Agricultural Science, Cambridge 67, 287–93.CrossRefGoogle Scholar
Edey, T. N. (1969). Prenatal mortality in the sheep. A review. Animal Breeding Abstracts 37, 173–90.Google Scholar
Edey, T. N. (1970 a). Nutritional stress and preimplantation mortality in Merino sheep (1964–7). General discussion and conclusions. The Journal of Agricultural Science, Cambridge 74, 199–204.CrossRefGoogle Scholar
Edey, T. N. (1970 b). Nutritional stress and preimplantation mortality in Merino sheep, 1966. Journal of Agricultural Science, Cambridge 74, 187–92.CrossRefGoogle Scholar
Edey, T. N. (1970 c). Nutritional stress and preimplantation mortality in Merino sheep, 1967. Journal of Agricultural Science, Cambridge 74, 193–8.CrossRefGoogle Scholar
Foote, W. C., Pope, A. L., Chapman, A. B. & Casida, L. E. (1959). Reproduction in the yearling ewe as affected by breed and sequence of feeding levels. I. Effects on ovulation rate and embryo survival. Journal of Animal Science 18, 453–62.CrossRefGoogle Scholar
Hulet, C. V., Price, D. A. & Foote, W. C. (1968). Effects of variation in light, month of year and nutrient intake on reproductive phenomena in ewes during the breeding season. Journal of Animal Science 27, 684–90.CrossRefGoogle ScholarPubMed
Jefferies, B. C. (1961). Body condition scoring and its use in management. Tasmanian Journal of Agriculture, 32 19–21.Google Scholar
Killeen, I. D. (1967). The effects of body weight and level of nutrition before and after joining on ewe fertility. Australian Journal of Experimental Agriculture and Animal Husbandry 7, 126–36.CrossRefGoogle Scholar
Kramer, C. Y. (1956). Extension of multiple range tests to group means with unequal numbers of replicates. Biometrics 12, 307–10.CrossRefGoogle Scholar
Moore, N. W. (1968). The survival and development of fertilized eggs transferred between Border Leicester and Merino ewes. Australian Journal of Agricultural Research 19, 293–302.CrossRefGoogle Scholar