Abstract
THE occurrence of breeding is closely associated with climatic conditions and the periodicity of the seasons. Increased length of illumination advances the date of the first œstrus in mammals like the ferret1,2, and was briefly reported by Dawson3 to have a similar effect on cats maintained in Cambridge, Mass.
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References
Bissonnette, T. H., Proc. Roy. Soc., B., 110, 322 (1937).
Hammond, J., Nature, 167, 150 (1951).
Dawson, A. B., Endocrinol., 128, 907 (1941).
Scott, P. P., and Lloyd-Jacob, M. A., Studies on Fertility, 7, 123 (1955).
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SCOTT, P., LLOYD-JACOB, M. Reduction in the Anœstrus Period of Laboratory Cats by Increased Illumination. Nature 184, 2022 (1959). https://doi.org/10.1038/1842022a0
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DOI: https://doi.org/10.1038/1842022a0
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