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Fertility in southdown sheep1

Published online by Cambridge University Press:  27 March 2009

J. E. Nichols
J. E. Nichols
Affiliation:
(Animal Breeding Research Department, University of Edinburgh.)
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Extract

Data from 26 flocks, involving a total of 5014 pure-bred Southdown ewes, were available for analysis and discussion. For ewes of all ages the proportion giving birth to twins is closely associated with the total yield of lambs, and while barrenness and abortion may to a certain extent be due to the same causes, it is those factors which cause abortion which also affect the yield by reducing the number of single births, rather than the number of multiple births.

The low fertility of shearling ewes is due to barrenness through reduced or delayed ovulation.

The writer wishes to express his thanks to the breeders who supplied the records of their flocks and particularly to the Honorary Secretary of the Southdown Sheep Society for his help in the collection of these records.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 16 , Issue 3 , July 1926 , pp. 365 - 375
Copyright
Copyright © Cambridge University Press 1926

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References

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