Hostname: page-component-7bb8b95d7b-fmk2r Total loading time: 0 Render date: 2024-09-07T05:23:33.476Z Has data issue: false hasContentIssue false
  • English
  • Français

Nutritional stress and pre-implantation embryonic mortality in Merino sheep

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
Get access Rights & Permissions [Opens in a new window]

Extract

1. Embryonic mortality and reproductive performance were studied in 150 mature Merino ewes, groups of which were restricted to approximately 15% of their maintenance requirement from days 0to7 (group 1), 6to13 (group 3) and 13to20 (group 4) respectively. Groups 2and5 were controls. Ovulation point counts, returns to service, pregnancy test by laparotomy at day 40 and lambing performance were used to assess and apportion the embryonic loss.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 67 , Issue 3 , December 1966 , pp. 287 - 293
Copyright
Copyright © Cambridge University Press 1966

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

Adams, C. E. (1962). Studies on prenatal mortality in the rabbit (Oryctolagus cuniculus): the effect of transferring varying numbers of eggs. J. Endocr. 24, 471–90.Google ScholarPubMed
Bellows, R. A., Pope, A. L., Chapman, A. B. & Casida, L. E. (1963). Effect of level and sequence of feeding and breed on ovulation rate, embryo survival and fetal growth in the mature ewe. J. Anim. Sci. 22, 101–8.CrossRefGoogle Scholar
Bennett, D., Axelsen, A. & Chapman, H. W. (1964). The effect of nutritional restriction during early pregnancy on numbers of lambs born. Proc. Aust. Soc. Anim. Prod. 5, 70–2.Google Scholar
Boyd, H. (1965). Embryonic death in cattle, sheep and pigs. Vet. Bull. 35, 251–66.Google Scholar
Brambell, F. W. R. (1948). Prenatal mortality in mammals. Biol. Rev. 23, 370–407.CrossRefGoogle ScholarPubMed
Coop, I. E. (1962). Liveweight-productivity relationships in sheep. N.Z. J. agric. Res. 5, 249–64.CrossRefGoogle Scholar
Coop, I. E. (1964). Liveweight, flushing and ewe fertility. Proc. Ruakura Fmrs. Conf. Week, pp. 69–76.Google Scholar
Davies, J. (1952). Correlated anatomical and histochemical studies on the mesonephros and placenta of the sheep. Am. J. Anat. 91, 263–99.CrossRefGoogle ScholarPubMed
Dutt, R. H. (1954). Fertility rate and embryonic death loss in ewes early in the breeding season. J. Anim. Sci. 13, 464–73.CrossRefGoogle Scholar
Dutt, R. H. (1963). Critical period for early embryo mortality in ewes exposed to high ambient temperature. J. Anim. Sci. 22, 713–19.CrossRefGoogle Scholar
Eckstein, P., Mckeown, T. & Record, R. G. (1955). Variation in placental weight according to litter size in the guinea-pig. J. Endocr. 12, 108–13.CrossRefGoogle ScholarPubMed
Edey, T. N. (1965). Undernutrition and early embryonic mortality in Merino ewes. Nature, Lond. 208, 1232.CrossRefGoogle ScholarPubMed
Edey, T. N. & Thwaites, C. J. (1966). Synchronization of ewes at the second oestrus after progestagen treatment. Proc. Aust. Soc. Anim. Prod. 6, 38–43.Google Scholar
Edey, T. N. (1967). Early embryonic death and subsequent cycle length in the ewe. J. Reprod. Fert. 13 (In the Press.)CrossRefGoogle ScholarPubMed
Edgar, D. G. (1962). Studies on infertility in ewes. J. Reprod. Fert. 3, 50–4.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. J. Anim. Sci. 14, 919–29.CrossRefGoogle Scholar
Everitt, G. C. (1964). Maternal undernutrition and retarded foetal development in Merino sheep. Nature, Lond. 201, 1341–2.CrossRefGoogle ScholarPubMed
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. J. Anim. Sci. 18, 453–62.CrossRefGoogle Scholar
Green, W. W. & Winters, L. M. (1946). Prenatal development of the sheep. Tech. Bull. Minn. Agric. Exp. Stn no. 169.Google Scholar
Hammond, J. (1921). Further observations on the factors controlling fertility and foetal atrophy. J. agric. Sci., Camb. 11, 337–66.CrossRefGoogle Scholar
Hartley, W. J. (1963). Selenium and ewe fertility. Proc. N.Z. Soc. Anim. Prod. 23, 20–7.Google Scholar
Hasnain, H. U. (1964). Embryonic mortality in sheep. Proc. 5th Int. Congr. Anim. Reprod. A.I. (Trento), 2, 342–8.Google Scholar
Henning, W. L. (1939). Prenatal and postnatal sex ratio in sheep. J. agric. Res. 58, 565–80.Google Scholar
Hulet, C. V., Voigtlander, H. P. Jr, Pope, A. L. & Casida, L. E. (1956). The nature of early season infertility in sheep. J. Anim. Sci. 15, 607–16.CrossRefGoogle Scholar
Hunter, G. L. (1959). A contribution to the study of the problem of low fertility among Merino ewes in South Africa. J. agric. Sci., Camb. 52, 282–95.CrossRefGoogle Scholar
Laffey, N. & Hart, D. S. (1959). Embryonic loss from late breeding season matings of ewes. N.Z. J. agric. Res. 2, 1159–66.CrossRefGoogle Scholar
Lamond, D. R. & Urquhart, E. J. (1961). Sheep laparotomy cradle. Aust. vet. J. 37, 430–1.CrossRefGoogle Scholar
Mckenzie, F. F. & Terrill, C. E. (1937). Estrus, ovulation and related phenomena in the ewe. Res. Bull. Mo. Agric. Exp. Stn no. 264.Google Scholar
McLaren, A. & Michie, D. (1960). Control of prenatal growth in mammals. Nature, Lond. 187, 363–5.CrossRefGoogle Scholar
Moor, R. M. & Rowson, L. E. A. (1964). Influence of the embryo and uterus on luteal function in the sheep. Nature, Lond. 201, 522–3.CrossRefGoogle ScholarPubMed
Pursel, V. G. & Graham, E. F. (1962). Induced estrus in anestrous ewes by use of progestogens and follicle stimulating hormone. J. Anim. Sci. 21, 132–6.CrossRefGoogle Scholar
Radford, H. M., Watson, R. H. & Wood, G. F. (1960). A crayon and associated harness for the detection of mating under field conditions. Aust. vet. J. 36, 57–66.CrossRefGoogle Scholar
Robinson, T. J. (1951). The control of fertility in sheep. J. agric. Sci., Camb. 41, 6–63.CrossRefGoogle Scholar
Robinson, T. J. (1957). Chapter 18 in Progress in the Physiology of Farm Animals, (ed. Hammond, J.), vol. III. London: Butterworths.Google Scholar
Wallace, L. R. (1948). The growth of lambs before and after birth in relation to the level of nutrition. Part III. J. agric. Sci., Camb. 38, 367–401.CrossRefGoogle Scholar
Williams, H. Ll., Hill, R. & Alderman, G. (1965). The effects of feeding kale to breeding ewes. Br. vet. J. 121, 2–17.CrossRefGoogle ScholarPubMed