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Studies on reproduction in prolific ewes

2. A radiographic study of the primary and secondary ossification centres in the foetus

Published online by Cambridge University Press:  27 March 2009

G. Wenham
G. Wenham
Affiliation:
The Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
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Summary

A radiographic study was made of the skeletons of 216 Suffolk x (Finnish Landrace x Polled Dorset Horn) sheep foetuses of known gestational age within the range 50–145 days. They comprised 10 singles, 42 twins, 105 triplets, 44 quadruplets and 15 quintuplets.

The ages at which the primary and secondary centres of ossification first appeared are presented together with a description of the normal pattern of skeletal development. Attention is drawn to the variations which are found from one foetus to another. The main anatomical features of ovine foetal bone development are illustrated by line drawings and charts.

By anatomical grouping the number of ossification centres was reduced to 80, including 40 primary and 40 secondary centres. Scores were obtained for each foetus by taking the numbers of primary and secondary centres that were present as percentages of the possible totals. The primary score was linearly related to foetal age up to about 100 days, and the secondary score was linearly related to foetal age beyond about 100 days. The relationships to foetal weight were similar but less close.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 88 , Issue 3 , June 1977 , pp. 553 - 566
Copyright
Copyright © Cambridge University Press 1977

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References

Benzie, D. (1950). Growth of skeleton of the foetal sheep. British Veterinary Journal 106, 231–4.CrossRefGoogle ScholarPubMed
Cloete, J. H. L. (1939). Prenatal growth in the Merino sheep. Onderstepoort Journal of Veterinary Science 13, 417–558.Google Scholar
Dun, R. E. (1955). Aging the Merino foetus. Australian Veterinary Journal 31, 153–8.CrossRefGoogle Scholar
Lascelles, A. K. (1959). The time of appearance of ossification centres in the peppin-type Merino. Australian Journal of Zoology 7, 79–86.CrossRefGoogle Scholar
Richardson, C., Herbert, C. N. & Terlecki, S. (1976). Estimation of the developmental age of the ovine foetus and lamb. Veterinary Record 99, 22–5.CrossRefGoogle ScholarPubMed
Robinson, J. J., Mcdonald, I., Fraser, C. & Crofts, R. M. (1977). Studies on reproduction in prolific ewes. 1. Growth of the products of conception. Journal of Agricultural Science, Cambridge 88, 539–52.CrossRefGoogle Scholar
Sisson, S. & Grossman, J. D. (1953). Anatomy of the Domestic Animals,4th ed. Philadelphia: Saunders.Google Scholar
Stephenson, S. K. (1962). Pre-natal growth in Romney and Southdown cross and Australian Merino sheep. Australian Journal of Agricultural Research 13, 733–66.CrossRefGoogle Scholar
Wallace, L. R. (1948). Growth of lambs before and after birth in relation to nutrition. Journal of Agricultural Science, Cambridge 38, 243–401.CrossRefGoogle Scholar
Wenham, G., Mcdonald, I. & Elsley, F. W. H. (1969). A radiographic study of the development of the skeleton of the foetal pig. Journal of Agricultural Science, Cambridge 72, 123–30.CrossRefGoogle Scholar
Wenham, G., Fowler, V. R. & Mcdonald, I. (1973). A radiographic study of skeletal growth and development in the pig. Temporal pattern of growth. Journal of Agricultural Science, Cambridge 80, 125–33.CrossRefGoogle Scholar