名词
中文翻译：繁殖比率
同义词：
['breeding index', 'breeding efficiency']
例句：
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1. The breeding ratio of this breed is 2:1, meaning that every two females produce one male.
这个品种的繁殖比例是2:1，意味着每两个雌性产生一个雄性。
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2. Breeding ratios are crucial for the success of a breeding program.
繁殖比例对于育种计划的成功至关重要。
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3. The breeding ratio was adjusted to improve the genetic diversity of the population.
为了提高种群的遗传多样性，调整了繁殖比例。