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Poultry researchers found that domestic cockerels “allocate sperm differently according to the quality of copulation”; new mates tend to receive more sperm than familiar partners, and the roosters increase their sperm deposits in the presence of other males.

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Poultry researchers found that domestic cockerels “allocate sperm differently according to the quality of copulation”; new mates tend to receive more sperm than familiar partners, and the roosters increase their sperm deposits in the presence of other males.

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