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

  • J. C. Guerra (a1), C. J. Thwaites (a1) and T. N. Edey (a1)

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.

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Coop, I. E. (1962). Liveweight-productivity relationships in sheep. I. Liveweight and reproduction. N.Z. J. agric. Res. 5, 249–64.
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.
Edey, T. N. (1966). Nutritional stress and pre-implantation embryonic mortality in Merino sheep. J. agric. Sci., Camb. 67, 287–93.
Edey, T. N. (1969). Prenatal mortality in sheep: A review. Anim. Breed. Abstr. 37, 173–90.
Edey, T. N. (1970). Nutritional stress and pre-implantation embryonic mortality in Merino sheep, 1965. J. agric. Sci., Camb. 74, 181–86.
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.
Hafez, E. S. E. (1952). Studies on the breeding season and reproduction of the ewe. J. agric. Sci., Camb. 42, 189265.
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.

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

  • J. C. Guerra (a1), C. J. Thwaites (a1) and T. N. Edey (a1)

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