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首页> 外文期刊>Productions Animales >Use of melatonin implants and daylength treatments to control seasonal reproduction in sheep and goats.
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Use of melatonin implants and daylength treatments to control seasonal reproduction in sheep and goats.

机译：使用褪黑激素植入物和整日治疗来控制绵羊和山羊的季节性繁殖。

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This review describes research carried out to manipulate the reproduction of sheep and goats using Melovine, a melatonin implant which received registration in France in 1995. Continuous administration of melatonin mimics conditions of short daylength. Alternation between long and short days is used to regulate the period of sexual activity. A subcutaneous melatonin implant was inserted in ewes 30-40 days before mating. This increased fecundity by 16 lambs per 100 ewes mated and brought forward thelambing date. Combining oestrus synchronization, AI and melatonin treatment increased fecundity by 30 lambs per 100 ewes. To produce out-of-season ram spermatozoa, daylength was increased by 1 h before the melatonin was implanted. This stimulated testisgrowth, sperm production, sexual behaviour and fertility. One month of long days followed by 1 month of short days induced elevated sperm production which lasted for several years. The same results were obtained with 1 month of 1 h extra daylight followed by 1 month of melatonin treatment. Photoperiodic treatment of male goats required 1 h extra daylength for 2 months before melatonin implant insertion. Mating was then carried out between 35 and 70 days after the end of the photoperiodic treatment. This produced about 80% of normal fertility levels and fertilization about 10 days after introduction of males. Alternation between long and short days produced increased sperm production which was maintained for >3 years.
机译：这篇综述描述了使用褪黑素植入物美洛芬（Melovine）操纵绵羊和山羊繁殖的研究，褪黑素植入物于1995年在法国获得了注册。褪黑素的连续给药模仿了短日照的情况。长日和短日之间的交替用于调节性活动的时间。在交配前30-40天将皮下褪黑激素植入物插入母羊。每繁殖一头母羊，繁殖力就提高了16头，并提前了分娩日期。发情同步，AI和褪黑素治疗相结合，使繁殖力每100头母羊增加30只羔羊。为了生产反季节的精子，在植入褪黑激素之前将日长增加1小时。这刺激了睾丸的生长，精子的产生，性行为和生育能力。一个月的漫长日子随后一个月的短暂日子导致精子产量增加，持续了数年。在1个小时的额外日光照射下1个月褪黑激素治疗后，可获得相同的结果。雄性山羊的光周期治疗在褪黑激素植入物植入之前需要额外增加1小时的时间，持续2个月。然后在光周期处理结束后的35至70天之间进行交配。这产生了大约80％的正常生育水平，并在引入雄性后约10天施肥。长日和短日交替产生的精子产量增加，维持超过3年。

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