Hostname: page-component-586b7cd67f-vdxz6 Total loading time: 0 Render date: 2024-11-20T07:04:59.243Z Has data issue: false hasContentIssue false
  • English
  • Français

Studies on the adaptability of three breeds of sheep to a tropical environment modified by altitude VII. Sexual activity in relation to age of ram

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

The effect of age on attainment of puberty and on seminal characteristics in yearling and mature rams was studied in German Merino, Persian Blackhead and indigenous Native rams living on Rhodesian highveld.

1. Puberty occurred at age and live weight proportional to mature live weight. Well-grown Native lambs ejaculated first at 169 days of age and 46 lb. live weight; Merino lambs when 250 days old and 79 lb. live weight and Persians were intermediate. Onset of sexual maturity was related more closely to live weight than to age, since runts ejaculated first at live weights close to those of well-grown lambs.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 56 , Issue 2 , April 1961 , pp. 179 - 181
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

Barton, R. A. (1951). Nature, Lond., 168, 37.CrossRefGoogle Scholar
Davies, D. V. & Mann, T. (1947). Nature, Lond., 160, 295.CrossRefGoogle Scholar
Dun, R. B. (1955). Aust. Vet. J. 31, 104.CrossRefGoogle Scholar
Eaton, O. N., Schott, R. G., Simmons, V. L. & Frank, A. H. (1948). J. Anim. Sci. 7, 449.Google Scholar
Hafez, E. S. E. (1952). J. Agric. Sci. 42, 189.CrossRefGoogle Scholar
Hafez, E. S. E. (1953). Emp. J. Exp. Agric. 21, 217.Google Scholar
Laing, J. A. (1955). Fertility and Infertility in Domestic Animals. London: Baillifère.Google Scholar
Phillips, R. W. & Andrews, F. N. (1936). Bull. Mass. Agric. Exp. Sta. no. 331.Google Scholar
Rice, V. A., Andrews, F. N. & Warwick, E. J. (1953). Breeding Better Livestock. London: McGraw Hill Publ. Co.Google Scholar
Symington, R. B. (1961). J. Agric. Sci. 56, 165.CrossRefGoogle Scholar
Terrill, C. E. (1938). Proc. Amer. Soc. Anim. Prod. 31st Ann. Meet. p. 308.Google Scholar
Watson, R. H., Sapsford, C. P. & McCance, J. E. (1956). Aust. J. Agric. Res. 7, 6.CrossRefGoogle Scholar
Wiggins, E. L. & Terrill, C. E. (1953). J. Anim. Sci. 12, 524.CrossRefGoogle Scholar
Winters, L. M. (1954). Animal Breeding. New York: Wiley and Sons, Inc.Google Scholar