Hostname: page-component-586b7cd67f-2brh9 Total loading time: 0 Render date: 2024-11-20T06:53:35.407Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access Rights & Permissions [Opens in a new window]

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.

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Briggs, P. K., Franklin, M. C. & McClymont, G. L. (1956). Aust. Vet. J. 32, 299.CrossRefGoogle Scholar
Gunn, R. M. C., Sanders, R. N. & Granger, W. (1942). C.S.I.R.O. Aust. Bull. no. 148.Google Scholar
Lindley, C. E., Brugnan, H., Cunha, T. I. & Warwick, E. J. (1949). J. Anim. Sci. 8, 590.CrossRefGoogle Scholar
Moule, G. R. (1950). Aust. Vet. J. 26, 84.CrossRefGoogle Scholar
Sapsford, C. P. (1951). Aust. J. Agric. Res. 2, 331, 561.CrossRefGoogle Scholar
Symington, R. B. (1961). J. Agric. Sci. 56, 165.CrossRefGoogle Scholar