Abstract
Although it is well known that sheep, and particularly those of British origin, are seasonal breeders, there has been a lack of definite knowledge of the cause of this.
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YEATES, N. Influence of Variation in Length of Day upon the Breeding Season in Sheep. Nature 160, 429–430 (1947). https://doi.org/10.1038/160429b0
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DOI: https://doi.org/10.1038/160429b0
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