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The performance of sheep with differing haemoglobin and potassium blood types

Published online by Cambridge University Press:  27 March 2009

J. W. B. King ,
J. V. Evans ,
H. Harris  and
F. L. Warren
J. W. B. King
Affiliation:
A.R.C. Animal Breeding Research Organisation, Edinburgh 9
J. V. Evans
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeenshire
H. Harris
Affiliation:
London Hospital Medical College, London, E. 1
F. L. Warren
Affiliation:
London Hospital Medical College, London, E. 1
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Extract

1. Records of sheep with differing haemoglobin and potassium blood types were examined in a large flock of Scottish Blackface sheep.

2. Differences in reproductive performance, which would be subject to natural selection, and in growth rate, fleece characteristics, etc., which would be subject to artificial selection, were sought as an explanation for the gene frequencies observed in different breeds.

3. No significant differences were found in any weights or measurements.

4. The number of lambs produced by different types of ewe did not differ significantly, although there was some suggestion that haemoglobin heterozygotes produce a larger number of lambs at weaning.

5. Study of the equilibrium of the population, however, showed that any heterozygote advantage, if it exists at all, can only be small.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 51 , Issue 3 , December 1958 , pp. 342 - 346
Copyright
Copyright © Cambridge University Press 1958

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References

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