J. Anim Sci.
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J. Anim Sci. 1976. 42:1217-1219.
© 1976 American Society of Animal Science
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Orientation of Sheep Fetuses in Utero in Relation to Stage of Pregnancy

Patrick F. Scanlon1,2,3

Virginia Polytechnic Institute and State University , Blacksburg, Virginia 24061

Abstract

A total of 1,117 sheep fetuses was recovered from sheep at all stages of pregnancy. Data were recorded on the orientation of fetuses in utero in relation to the estimated stage of pregnancy. Data were divided into 10-day stages of pregnancy, as estimated from crown-rump measurements, and the proportion of fetuses in anterior presentation was tested against a random distribution (50:50) by means of chi-square tests. The proportion of fetuses in anterior presentation was significantly different (P<.05) from 50:50 during the following stages of pregnancy: 81 to 90, 101 to 110, and 111 to 120 days pregnant. Later than 120 days, too few fetuses were examined to determine significant differences although the great majority were in anterior presentation. Significantly fewer (P<.05) twin fetuses were in anterior presentation during the 101 to 110 and 111 to 120-day stages of pregnancy than single fetuses.

Footnotes

1 Data were collected when the author was associated with the Faculty of Agriculture, University College, Dublin, Ireland.

2 Financial support of the Department of Agriculture and Fisheries, Dublin, and of The Agricultural Institute, Dublin, is appreciated. Facilities to collect reproductive organs from sheep were provided by Irish Meat Packers, Leixlip, Ireland, by Dublin Meat Packers, Ballymun, Ireland, and by the Dublin City Abattoir.

3 Department of Fisheries and Wildlife Sciences.






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Copyright © 1976 by the American Society of Animal Science.