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首页> 外文期刊>Small Ruminant Research >Testicular morphology and sperm content relative to age, antler status and season in axis deer stags (Axis axis)
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Testicular morphology and sperm content relative to age, antler status and season in axis deer stags (Axis axis)

机译：与年龄，鹿角状态和季节有关的axis鹿雄鹿的睾丸形态和精子含量（Axis axis）

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摘要

Testes were collected from 192 axis deer stags (Axis axis) in south Texas to quantify changes in testicular morphology and sperm content relative to age (juvenile: 1-2 years of age; mature: >2 years of age), antler status (hard antler; velveto antler) and season. Following harvest, morphological measurements of each testis were recorded, and the left testis and epididymis (caput, corpus and caudal regions) were homogenized individually for the determination of sperm content. In summer and autumn, 96.2% (102/106) of the stags harvested were in hard antler; in contrast to 23.3% (20/86) in the winter and spring. Testis weight and epididymal weight were positively correlated (r = 0.75; P < 0.0001), as were testis weight and total testis sperm content (r = 0.63; P < 0.0001), testis volume and total testis sperm content (r = 0.60; P < 0.0001), and epididymal weight and epididymal sperm content (r = 0.72; P < 0.0001). Sperm content per gram of parenchyma for juvenile stags was similar (P > 0.10) during spring, summer and winter, while total testis sperm content in spring and summer were greater (P < 0.05) than in autumn or winter. Juvenile stags tended to have greater (P < 0.08) testis sperm content per gram of parenchyma and greater (P < 0.05) total testis sperm content in velveto antlered than in hard antlered stags. For mature stags, total testis sperm content and total epididymal sperm content were greater (P < 0.05) in summer than during all other seasons. Irrespective of seasonal fluctuations in testicular and epididymal sperm content, at no time were stags found to be azoospermic. Testis weight, total epididymal weight, total testis sperm content and total epididymal sperm content were greater (P < 0.05) in mature hard antlered than in velveto antlered stags. These data indicate that while seasonal changes in testis sperm content and morphology do occur and pattern antler cycles in the axis stag, these changes are less pronounced than in more temperate species of cervids. These results support previous field-based observations regarding the capability of axis stags in Texas to maintain testicular function throughout the year regardless of antler status. Nevertheless, additional investigations are needed to further assess the breeding potential (i.e. fertility) and libido of axis stags relative to antler status and season.
机译：从得克萨斯州南部的192头鹿鹿（轴）收集睾丸，以量化睾丸形态和精子含量相对于年龄（少年：1-2岁;成熟：> 2岁），鹿角状态（坚硬）的变化。鹿角;天鹅绒/无鹿角）和季节。收获后，记录每个睾丸的形态学测量值，并分别均质化左睾丸和附睾（帽、,体和尾区）以测定精子含量。在夏季和秋季，收获的雄鹿中有96.2％（102/106）是在硬鹿角中。相比之下，冬季和春季则为23.3％（20/86）。睾丸重量和附睾重量呈正相关（r = 0.75; P <0.0001），睾丸重量和总睾丸精子含量（r = 0.63; P <0.0001），睾丸体积和总睾丸精子含量也呈正相关（r = 0.60; P <0.0001），附睾重量和附睾精子含量（r = 0.72; P <0.0001）。春季，夏季和冬季，每小ju的每克薄壁组织的精子含量相似（P> 0.10），而春季和夏季的睾丸总精子含量高于秋季或冬季（P <0.05）。相对于硬鹿角雄鹿，幼鹿每克薄壁组织中的睾丸精子含量往往更高（P <0.08），而天鹅绒/无鹿角中的睾丸总精子含量更高（P <0.05）。对于成熟的雄鹿，夏季的睾丸总精子含量和附睾总精子含量高于其他所有季节（P <0.05）。不论睾丸和附睾精子含量的季节性波动如何，都没有发现雄性无精子症。成熟硬质硬鹿角的睾丸重量，附睾总重量，睾丸总精子含量和附睾总精子含量高于（无鹿角）鹿茸（P <0.05）。这些数据表明，尽管确实发生了睾丸精子含量和形态的季节性变化，并且在雄鹿的轴上有鹿角图案的变化，但与温带的子宫颈物种相比，这些变化并不那么明显。这些结果支持以前基于现场的观察，涉及得克萨斯州的雄鹿在整个一年中保持睾丸功能的能力，而不论鹿角状态如何。尽管如此，仍需要进一步调查以进一步评估与鹿角状态和季节有关的轴牡鹿的繁殖潜力（即繁殖力）和性欲。

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