Embryonic survival and development at various stages of gestation after bilateral egg transfer in the cow

in Reproduction
Authors:
J. M. Sreenan
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and
D. Beehan
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DOI:
https://doi.org/10.1530/jrf.0.0470127
Volume/Issue:
Volume 47: Issue 1
Page Range:
127–128
Article Type:
Research Article
Online Publication Date:
May 1976
Free access

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The Agricultural Institute, Belclare, Galway, Ireland

In sheep, embryonic loss is higher after multiple ovulation than single ovulation (Casida, Woody & Pope, 1966; Edey, 1966; Mackenzie & Edey, 1975). Among twin-ovulating sheep, mortality is greater if both ovulations occur from the same ovary (Baier & Russe, 1968; Scanlon, 1972). Few data are available on the incidence of multiple ovulation in cattle and the extent of prenatal loss in multiple pregnancies is unknown. The development of egg transfer techniques in cattle (Rowson, Moor & Lawson, 1969) has permitted the establishment of twin pregnancies (Rowson, Lawson & Moor, 1971; Sreenan, Beehan & Mulvehill, 1975), and the embryonic survival and development in heifers becoming pregnant after bilateral surgical transfers were therefore examined.

Superovulation, egg recovery and transfer were carried out as previously described (Sreenan et al., 1975). All recipient heifers were checked for return to oestrus with the aid of vasectomized bulls. Initial

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Print ISSN:
1470-1626
Online ISSN:
1741-7899