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Conceptus development following blastocyst transfer to ewes induced to ovulate at 28 days post-partum

Published online by Cambridge University Press:  24 November 2017

J.M. Wallace ,
R.P. Aitken  and
M.A. Cheyne
J.M. Wallace
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
R.P. Aitken
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
M.A. Cheyne
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
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Extract

The use of laparoscopic intrauterine insemination to deposit semen directly into the tip of the uterine horn thus bypassing the involuting uterus ensures fertilization in ewes induced to ovulate at 3 to 5 weeks post-partum. Acceptable pregnancy rates are achieved if embryos from post-partum donors are transferred to a normal uterine environment (60%; Wallace, Robinson & Aitken, 1989a) but embryos rarely survive when transferred or returned to a post-partum uterus (0-25%; Wallace, Robinson & Aitken, 1989b; McKelvey, Wallace, Robinson & Aitken, 1989). Furthermore, when conceptus development was assessed at Day 16 after insemination only a small sub-set of post-partum ewes remained pregnant, suggesting that any defect in the maternal/embryonic dialogue which may inhibit the re-establishment of pregnancy in post-partum ewes occurs prior to this stage (Wallace, Ashworth, Aitken & Cheyne, 1991).

In the current study a novel blastocyst transfer procedure was developed to test whether the post-partum uterus can support conceptus development during the period of rapid growth coincident with the maternal recognition of pregnancy.

Type
Ruminant Reproduction
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1992 , March 1992 , pp. 42
Copyright
Copyright © The British Society of Animal Production 1992

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References

McKelvey, W.A.C., Wallace, J.M., Robinson, J.J. & Aitken, R.P. (1989) Anim. Reprod. Sci. 18: 271–283.CrossRefGoogle Scholar
Wallace, J.M., Robinson, J.J. & Aitken, R.P. (1989a) J. Reprod. Fert. 86: 627–635.Google Scholar
Wallace, J.M., Robinson, J.J. & Aitken, R.P. (1989b) J. Reprod. Fert. 85: 229–240.CrossRefGoogle Scholar
Wallace, J.M., Helliwell, R. & Morgan, P.J. (1991) Reprod. Fert. Devel. 3(2): 127–136.Google Scholar
Wallace, J.M., Ashworth, C.J., Aitken, R.P. & Cheyne, M.A. (1991) J. Reprod. Fert. Abstract Series 6, pp.16.Google Scholar