Hostname: page-component-586b7cd67f-vdxz6 Total loading time: 0 Render date: 2024-11-25T06:21:10.585Z Has data issue: false hasContentIssue false
  • English
  • Français

The effects of live weight on the ovarian response to pregnant mare serum gonadotrophin and on embryo mortality in the ewe

Published online by Cambridge University Press:  27 March 2009

J. C. Guerra ,
C. J. Thwaites  and
T. N. Edey
J. C. Guerra
Affiliation:
Department of Livestock Husbandry, University of New England, Armidale, N.S.W., Australia
C. J. Thwaites
Affiliation:
Department of Livestock Husbandry, University of New England, Armidale, N.S.W., Australia
T. N. Edey
Affiliation:
Department of Livestock Husbandry, University of New England, Armidale, N.S.W., Australia
Get access Rights & Permissions [Opens in a new window]

Extract

Despite the fact that early embryo mortality commonly leads to the loss of 25% of fertilized ova in ewes (Edey, 1969), little is known of factors associated with this loss. Severe, acute undernutrition (Edey, 1966) and high ambient temperatures (Dutt, Ellington & Carlton, 1959) are specific factors which are known to cause embryo death, but these do not normally occur in most sheep producing areas.

Type
Short Note
Information
The Journal of Agricultural Science , Volume 76 , Issue 1 , February 1971 , pp. 177 - 178
Copyright
Copyright © Cambridge University Press 1971

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Coop, I. E. (1962). Liveweight-productivity relationships in sheep. I. Liveweight and reproduction. N.Z. J. agric. Res. 5, 249–64.CrossRefGoogle Scholar
Dutt, R. H., Ellington, E. F. & Carlton, W. W. (1959). Fertilization rate and early embryo survival in sheared and unsheared ewes following exposure to elevated air temperatures. J. Anim. Sci. 18, 1308–18.CrossRefGoogle 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. (1969). Prenatal mortality in sheep: A review. Anim. Breed. Abstr. 37, 173–90.Google Scholar
Edey, T. N. (1970). Nutritional stress and pre-implantation embryonic mortality in Merino sheep, 1965. J. agric. Sci., Camb. 74, 181–86.CrossRefGoogle Scholar
Gordon, I. (1958). The use of progesterone and serum gonadotrophin (P.M.S.) in the control of fertility in sheep. I. The hormonal augmentation of fertility in the ewe during the breeding season. J. agric. Sci., Camb., 50, 123–51.CrossRefGoogle Scholar
Hafez, E. S. E. (1952). Studies on the breeding season and reproduction of the ewe. J. agric. Sci., Camb. 42, 189–265.CrossRefGoogle Scholar
Tassell, R. (1967). The effects of diet on reproduction in pigs, sheep and cattle. III. Plane of nutrition in sheep. Br. vet. J. 123, 257–64.CrossRefGoogle Scholar