Copulating cockerels can, it seems, tailor their ejaculate to several factors: the degree of male competition, whether they have mated with the female before, and the female's reproductive 'value'.
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Gage, M. Scramble for the eggs. Nature 426, 22–23 (2003). https://doi.org/10.1038/426022a
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DOI: https://doi.org/10.1038/426022a
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