Cassinello J, Abaigar T, Gomendio M, Roldan E R
Departamento de Ecología Evolutiva, Museo Nacional de Ciencias Naturales, CSIC, Madrid, Spain.
J Reprod Fertil. 1998 May;113(1):35-45. doi: 10.1530/jrf.0.1130035.
As part of a captive breeding programme for three species of endangered gazelles (Gazella dama mhorr, G. dorcas neglecta and G. cuvieri) the semen parameters for each species were characterized. The volume of ejaculated semen varied widely within species (G. dama: 565-5569 microliters; G. dorcas: 0-1454 microliters; G. cuvieri: 50-1411 microliters), as did sperm concentration (G. dama: 14-1629 x 10(6) ml-1; G. dorcas: 197-2836 x 10(6) ml-1; G. cuvieri: 228-927 x 10(6) ml-1). Sperm motility and viability were high in the three species. G. dama had a significantly lower proportion of normal spermatozoa, with a significantly higher proportion having abnormal heads and midpieces and more spermatozoa with cytoplasmic droplets. In addition, G. dama tended to have a lower proportion of spermatozoa with normal acrosomes. Sperm heads in G. dama and G. cuvieri were pear-shaped, whereas they were oval in G. dorcas. Spermatozoa from G. cuvieri were the longest. These data were also analysed in the context of three hypotheses that could explain inter-species differences in semen characteristics. Differences in testes size were due largely to differences in body size between species. However, no semen characteristic could be explained by allometric relationships. The three gazelle species differed in the intensity of sperm competition (as measured by relative testes mass), a factor that could explain differences in the proportion of normal spermatozoa. Finally, although the three species have reached different levels of inbreeding, this factor did not explain differences in semen characteristics in the population.
作为三种濒危瞪羚（阿拉伯瞪羚、细角瞪羚和曲角羚）圈养繁殖计划的一部分，对每个物种的精液参数进行了表征。射精精液的体积在物种内差异很大（阿拉伯瞪羚：565 - 5569微升；细角瞪羚：0 - 1454微升；曲角羚：50 - 1411微升），精子浓度也是如此（阿拉伯瞪羚：14 - 1629×10⁶毫升⁻¹；细角瞪羚：197 - 2836×10⁶毫升⁻¹；曲角羚：228 - 927×10⁶毫升⁻¹）。这三个物种的精子活力和存活率都很高。阿拉伯瞪羚的正常精子比例显著较低，头部和中段异常的比例显著较高，且有细胞质滴的精子更多。此外，阿拉伯瞪羚具有正常顶体的精子比例往往较低。阿拉伯瞪羚和曲角羚的精子头部呈梨形，而细角瞪羚的精子头部呈椭圆形。曲角羚的精子最长。这些数据还根据三种假设进行了分析，这三种假设可以解释物种间精液特征的差异。睾丸大小的差异在很大程度上是由于物种间体型的差异。然而，没有任何精液特征可以用异速生长关系来解释。这三种瞪羚在精子竞争强度（以相对睾丸质量衡量）上存在差异，这一因素可以解释正常精子比例的差异。最后，尽管这三个物种达到了不同程度的近亲繁殖，但这一因素并不能解释种群中精液特征的差异。
