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Studies on the adaptability of three breeds of sheep to a tropical environment modified by altitude VI. The effect of increased light and injections of vitamin A on semen production and sperm characteristics in tropical rams

Published online by Cambridge University Press:  27 March 2009

R. B. Symington
R. B. Symington
Affiliation:
Department of Agriculture, University College of Rhodesia and Nyasaland
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Extract

German Merino, Persian Blackhead and indigenous Native rams were exposed to gradually increasing day-length simulated by use of electric light in the night pen. Between February and June experimental day-length increased from 14 hr. 35 min. to 17 hr. whereas natural day-length fell from 13 hr. 50 min. to 12 hr. An additional trial was superimposed on the main experiment to determine the effect of vitamin A injections on reproductive function and on ability to respond to photoperiodic stimuli.

Information

Type
Research Article
Information
The Journal of Agricultural Science , Volume 56 , Issue 2 , April 1961 , pp. 173 - 177
Copyright
Copyright © Cambridge University Press 1961

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References

REFERENCES

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