Sperm competition between brothers and female choice
Females of the red jungle fowl mate with multiple males, which can create competition between sperm of different males in order to fertilize the egg. In my PhD thesis, I explored the effect of brotherhood on sperm competition and female choice. Interestingly, the brother of the first male that the female has mated with invests more sperm in the female than the nonbrother of the first male mate. However, the female ejects a higher proportion of sperm from the brother of the first mate and favours the sperm
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