这意味着衰老的公鸡与生育力旺盛的母鸡之间存在生物进化论冲突。
This implies an evolutionary conflict between ageing roosters and fertile hens.
研究人员采用了四种不同试验找出公鸡与母鸡对繁殖成功率的影响---虽然野外动物的研究存在某些困难。
The researchers used four different experiments to separate out the influence of male and female factors on reproductive success -- something that is difficult to study in wild animals.
起初，我们担心公鸡与母鸡会为争食而打架。
At first, we are worried that rooster and hens and fighting for Food fight.
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