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首页> 外文期刊>Productions Animales >Photoperiodism, testicular development and sperm production in poultry.
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Photoperiodism, testicular development and sperm production in poultry.

机译：家禽的光周期，睾丸发育和精子产生。

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This review looks at the effects of daylength on cockerel reproduction, testicular development and spermatogenesis. Increasing daily photoperiods in growing cockerels increases the age at which sexual maturity and testicular development occur. Spermproduction rapidly declines after sexual maturity in cockerels submitted to long days. Short constant days (8 h light, 16 h dark) are best to delay sexual maturity. The industry raises adult broiler cockerels under long days, together with hens to allowmating to proceed. Many males (8-12 per 100 females) are used to compensate for the decline in sperm production. The fowls are also on restricted feeding regimes to prevent fattening and to stimulate libido. Several deficient cockerels must be replacedduring the reproductive period. AI and daylength manipulation can lead to better management of males. It also allows fewer males to be used by matching semen use to the requirements of hens. The cost and technical requirements of AI mean it is not in usein broiler production in countries with high labour costs.
机译：这篇综述着眼于白天对公鸡繁殖，睾丸发育和精子发生的影响。日益增长的公鸡日照周期的增加会增加发生性成熟和睾丸发育的年龄。经过长时间的公鸡性成熟后，精子产量迅速下降。持续时间短（光照8小时，黑暗16小时）最好延迟性成熟。该行业在漫长的日子里饲养成年的肉鸡公鸡，并允许母鸡继续进行配种。许多雄性（每100雌性中有8-12个）被用来弥补精子产量的下降。禽类还采用严格的喂养方式，以防止发胖和刺激性欲。在繁殖期间必须更换一些不足的公鸡。人工授精和日间操纵可以改善男性的管理。通过将精液的使用量与母鸡的需求相匹配，还可以减少男性的使用。人工授精的成本和技术要求意味着在人工成本高的国家，人工授精不用于肉鸡生产。

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