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Seasonal effects on testes size and sustained semen quality in captive golden-headed lion tamarins, Leontopithecus chrysomelas.
Animal Reproduction Science ( IF 2.2 ) Pub Date : 2020-05-05 , DOI: 10.1016/j.anireprosci.2020.106472
Paloma Rocha Arakaki 1 , João Diego de Agostini Losano 1 , Paula Andrea Borges Salgado 2 , Ricardo José Garcia Pereira 1
Affiliation  

The golden-headed lion tamarin (Leontopithecus chrysomelas) is an endangered primate that, according to timing of births, there seems to have seasonal reproductive patterns in captive populations inhabiting the Southern Hemisphere. The extent to which male tamarins have circannual cyclic fluctuations in testicular functions, however, remains unknown. Changes in testis size and seminal variables, therefore, were evaluated during the rainy and dry seasons of the year in seven males. There was estimation of mating and birth seasons from the breeding colony using a 27 year database (229 birth records). Births were distributed throughout the year with peaks occurring in August-October and January-March (39.7 % and 30.5 % of all births, respectively). Semen collection using penile vibrostimulation was successfully induced in more than 96 % of the attempts regardless of the season (total of 75 ejaculates). Body mass did not vary significantly between seasons, but relative testes size was larger during the dry season. Values for none of the seminal variables (total sperm count, total and progressive motility, plasma membrane and acrosome integrity, and total sperm defects), however, were different during the rainy and dry seasons. These results indicate that testicular function in golden-headed lion tamarins may not be affected by daylength changes, and that seasonal patterns of female reproduction is perhaps more relevant for the reproductive timing of the species. Furthermore, the possibility of year-round production of ejaculates containing viable sperm broadens our perspective of preserving genetic diversity within the species because there is a greater opportunity for semen collection and freezing.



中文翻译:

圈养金头狮子猴睾丸大小和持续精液质量的季节性影响。

金头狮子猴(Leontopithecus chrysomelas)是一种濒临灭绝的灵长类动物,根据出生时机的不同,居住在南半球的圈养种群似乎具有季节性繁殖方式。然而,雄性绢毛猴在睾丸功能中具有周期性周期性波动的程度仍然未知。因此,在一年中的雨季和旱季期间,对7名男性的睾丸大小和精巢变量的变化进行了评估。使用27年的数据库(229个出生记录),可以从繁殖地估计出交配季节和出生季节。出生全年分布,八月至十月和一月至三月达到高峰(分别占所有出生的39.7%和30.5%)。不论季节如何(超过75次射精),成功地使用阴茎振动刺激收集精液的成功率超过96%。体重在各个季节之间没有显着变化,但是在干燥季节,相对睾丸的大小较大。然而,在雨季和旱季,精液总数(精子总数,总和进行性运动,质膜和顶体完整性以及总精子缺陷)的值均不同。这些结果表明,金狮l猴的睾丸功能可能不受日长变化的影响,而雌性繁殖的季节性模式可能与该物种的繁殖时间有关。此外,由于有更大的机会收集和冷冻精液,因此可能全年生产含有活精子的射精的可能性拓宽了我们维护物种内遗传多样性的视野。但在干旱季节,相对睾丸的大小较大。然而,在雨季和旱季,精液总数(精子总数,总和进行性运动,质膜和顶体完整性以及总精子缺陷)的值均不同。这些结果表明,金头狮子猴的睾丸功能可能不受日长变化的影响,雌性繁殖的季节性模式可能与该物种的繁殖时间更相关。此外,由于有更大的机会收集和冷冻精液,因此可能全年生产含有活精子的射精的可能性拓宽了我们维护物种内遗传多样性的视野。但在干旱季节,相对睾丸的大小较大。然而,在雨季和旱季,精液总数(精子总数,总和进行性运动,质膜和顶体完整性以及总精子缺陷)的值均不同。这些结果表明,金头狮子猴的睾丸功能可能不受日长变化的影响,雌性繁殖的季节性模式可能与该物种的繁殖时间更相关。此外,由于有更大的机会收集和冷冻精液,因此可能全年生产含有活精子的射精的可能性拓宽了我们维护物种内遗传多样性的视野。但是,在雨季和旱季,精液总数(精子总数,总和进行性运动,质膜和顶体完整性以及总精子缺陷)的值均不同。这些结果表明,金狮l猴的睾丸功能可能不受日长变化的影响,而雌性繁殖的季节性模式可能与该物种的繁殖时间有关。此外,由于有更大的机会收集和冷冻精液,因此可能全年生产含有活精子的射精的可能性拓宽了我们维护物种内遗传多样性的视野。然而,在雨季和旱季,精液总数(精子总数,总和进行性运动,质膜和顶体完整性以及总精子缺陷)的值均不同。这些结果表明,金头狮子猴的睾丸功能可能不受日长变化的影响,雌性繁殖的季节性模式可能与该物种的繁殖时间更相关。此外,由于有更大的机会收集和冷冻精液,因此可能全年生产含有活精子的射精的可能性拓宽了我们维护物种内遗传多样性的视野。在雨季和旱季有所不同。这些结果表明,金头狮子猴的睾丸功能可能不受日长变化的影响,雌性繁殖的季节性模式可能与该物种的繁殖时间更相关。此外,由于有更大的机会收集和冷冻精液,因此可能全年生产含有活精子的射精的可能性拓宽了我们维护物种内遗传多样性的视野。在雨季和旱季有所不同。这些结果表明,金头狮子猴的睾丸功能可能不受日长变化的影响,雌性繁殖的季节性模式可能与该物种的繁殖时间更相关。此外,由于有更大的机会收集和冷冻精液,因此可能全年生产含有活精子的射精的可能性拓宽了我们维护物种内遗传多样性的视野。

更新日期:2020-05-05
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