Hostname: page-component-586b7cd67f-gb8f7 Total loading time: 0 Render date: 2024-11-25T07:18:37.020Z Has data issue: false hasContentIssue false
  • English
  • Français

Fertility in Clun Forest sheep

Published online by Cambridge University Press:  27 March 2009

S. M. Williams
S. M. Williams
Affiliation:
University College of Wales, Aberystwyth
Get access Rights & Permissions [Opens in a new window]

Extract

The ages of the Clun ewes considered in the survey were ranged from between 1 and 4 years in practicbreeding ally every case. They had thus not attained their maximum fertility which probably occurs at the age of from 4 to 6 years. A consideration of the fertility in the breeding flocks does not provide an estimate of the maximum for this breed, which can only be obtained from older draft ewes which are used in crossbreeding flocks with the object of fat lamb production.

Barrenness is relatively unimportant in ewes, but affects approximately one-third of all breeding ewe lambs each year. Abortion was insignificant amongst ewes but was more common amongst ewe lambs.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 45 , Issue 2 , December 1954 , pp. 202 - 228
Copyright
Copyright © Cambridge University Press 1954

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

Bowstead, J. E. (1930). Sci. Agric. 10, no. 7, 429.Google Scholar
Brambell, F. W. B. (1930). The Development of Sex in Vertebrates. London: Sidgwick and Jackson.Google Scholar
Briggs, H. M. (1936). Bull. N. Dak. Agric. Exp. Sta. no. 285.Google Scholar
Burns, R. H. (1934). The Sheepman.Google Scholar
Bywater, T. L. (1945). J.R. Agric. Soc. 106, 166.Google Scholar
Clark, R. T. (1934). Anat. Rec. 60, no. 2, 125.CrossRefGoogle Scholar
Coop, I. E. (1950). J. Agric. Sci. 40, 311.CrossRefGoogle Scholar
Dry, F. W. (1936). J. Genet. 33, no. 1, 123.CrossRefGoogle Scholar
Fisher, R. A. (1948). Statistical Methods for Research Workers, 10th ed.Edinburgh: Oliver and Boyd.Google Scholar
Fraser, A. (1949). Sheep Husbandry. London: Crosby Lockwood and Son Ltd.Google Scholar
Goot, H. (1951). J. Agric. Sci. 41, 1.CrossRefGoogle Scholar
Griswold, D. J. (1932). Proc. Amer. Soc. Anim. Prod., 25th Ann. Meet., p. 181.Google Scholar
Hafez, E. S. E. (1952). J. Agric. Sci. 42, 189.CrossRefGoogle Scholar
Haines, G. (1931). J. Agric. Res. 42, 123.Google Scholar
Hammond, J. (1914). J. Agric. Sci. 6, 263.CrossRefGoogle Scholar
Hammond, J. (1940). J. Minist. Agric. 47, 116.Google Scholar
Hammond, J. (1941). J. Minist. Agric. 48, 77.Google Scholar
Harbour, H. E. (1945). Trans. Highl. Agric. Soc. Scot. 57, 16.Google Scholar
Heape, W. (1899). J.R. Agric. Soc. 10, 217.Google Scholar
Hume, D. L. (1939). Bi-m.Bull. N. Dak. Agric. Exp. Sta. 1, no. 6.Google Scholar
Johansson, I. (1932). Proc. Amer. Soc. Anim. Prod., 25th Ann. Meet., p. 285.Google Scholar
Jones, S. V. H. & Rouse, J. E. (1920). J. Dairy Sci. 3, 260.CrossRefGoogle Scholar
Kelley, R. B. (1939). Aust. Vet. J. 15, 184.CrossRefGoogle Scholar
Kelley, R. B. (1946). Bull. Coun. Sci. Industr. Res. Aust. no. 205.Google Scholar
Longwell, J. H. (1942). Bull. N. Dak. Agric. Exp. Sta. no. 316.Google Scholar
Marshall, F. H. A. (1904). Trans. Highl. Agric. Soc. Scot. 16, 34.Google Scholar
Marshall, F. H. A. & Hammond, J. (1952). Bull. Min. Agric. no. 39, 6th ed.Google Scholar
Marshall, F. R. & Potts, C. G. (1924). Bull. U.S. Dep. Agric. no. 996.Google Scholar
McKenzie, F. F. & Phillips, R. W. (1930). Proc. Amer. Soc. Anim. Prod. 23rd Ann. Meet. p. 138.Google Scholar
McKenzie, F. F. & Terrill, C. E. (1937). Res. Bull. Mo. Agric. Exp. Sta. no. 264.Google Scholar
Moule, G. R. & Jackson, M. N. S. (1949). Qd Agric. J. 69, 235.Google Scholar
Nichols, J. E. (1924). J. Minist. Agric. 31, 835.Google Scholar
Nichols, J. E. (1926 a). J. Minist. Agric. 33, 218.Google Scholar
Nichols, J. E. (1926 b). J. Agric. Sci. 16, 365.CrossRefGoogle Scholar
Nichols, J. E. (1927). Z. indukt. Abstamm.-u. Vererb-Lehre, 43, 313.Google Scholar
Okulicev, G. (1934). A.B.A. 2, 239.Google Scholar
Phillips, R. W., McKenzie, F. F., Christensen, J. V., Richards, G. S. & Pettersen, W. K. (1945). J. Anim. Sci. 4, 342.CrossRefGoogle Scholar
Price, W. T. (1931). Sheep Breeding Trials. Wilts. C.C. Report.Google Scholar
Rice, V. A. (1942). Breeding and Improvement of Farm Animals. New York: McGraw Hill.Google Scholar
Robinson, T. J. (1951). Biol. Rev. 26, 121.CrossRefGoogle Scholar
Roux, L. L. (1936). Onderstepoort J. Vet. Sci. 6, 465.Google Scholar
Russel Greig, J. (1943). Trans. Highl. Agric. Sci. Scot. 55, 16.Google Scholar
Spencer, D. A., Schott, R. G., Phillips, R. W. & Aume, B. (1942). J. Anim. Sci. 1, 27.CrossRefGoogle Scholar
Underwood, E. J. & Shier, F. L. (1941). J. Dep. Agric. W. Aust. 18, 13.Google Scholar
Venkatachalan, G., Nelson, R. H., Thorp, F. (Jr.) & Luecke, R. W. (1949). J. Anim. Sci. 8, 392.CrossRefGoogle Scholar
Wallace, L. R. (1949 a). Massey Agric. Coll. Sheep Farming Annual, 2, no. 1, 5.Google Scholar
Wallace, L. R. (1949 b). Rep. Anim. Res. Div. N.Z. Dep. Agric.Google Scholar
Watson, J. A. S. & More, J. A. (1947). Agriculture, The Science and Practice of British Farming, 8th ed.Edinburgh: Oliver and Boyd.Google Scholar
White, R. G. & Roberts, J. A. F. (1927). Welsh J. Agric. 3, 70.Google Scholar