Abstract
THE sexual season of ewe lambs lasts only a quarter to a third as long as that of adults1. In ewe lambs, sexual activity starts during November and December in Cambridge (N0)2, while it starts during June in New Zealand (S0)3; and consequently the sexual season coincides with the shortest days of the year irrespective of the hemisphere. Their sexual season, which varies with the breed, is not spread evenly about the shortest day as it is with adults4. The onset of the sexual season in ewe lambs varies with the month of birth2,5; data regarding the cessation or extension of the sexual season are notably lacking.
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References
Hafez, E. S. E., Nature, 166, 822 (1950).
Hammond, jun., J., J. Agric. Sci., 34, 97 (1944).
Walker, D. E., “The Breeding Season, Œstrus and the Œstrous Cycle in the New Zealand Ewes”, Univ. of N. Zealand thesis for M.Sc. degree (1943).
Hafez, E. S. E., J. Agric. Sci. (in preparation).
Watson, R. H. (personal communication, 1950).
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HAFEZ, E. Sexual Season in Ewe Lambs. Nature 168, 1046–1047 (1951). https://doi.org/10.1038/1681046a0
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DOI: https://doi.org/10.1038/1681046a0
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