Moura A R, Santos A R, Losano J D A, Siqueira A F P, Hamilton T R S, Zanella R, Caires K C, Simões R
Center for Natural and Human Sciences, Federal University of ABC, Santo André, Sao Paulo, Brazil.
Department of Animal Sciences, University of Florida, USA.
Zygote. 2023 Oct;31(5):507-516. doi: 10.1017/S0967199423000278. Epub 2023 Jul 26.
Wagyu bulls are known to have a highly exacerbated libido, as shown by the intense sexual interest of young calves. Therefore we believe that Wagyu male animals have specialized Sertoli and Leydig cells that are directly involved with the sexual precocity in this breed as mature bulls have a small scrotal circumference. This study aimed to evaluate whether there were differences in the hormone and sperm characteristics of Wagyu bulls compared with the same characteristics of subspecies and sires. Frozen-thawed semen from Wagyu, Nellore, and Angus sires were analyzed for sperm kinetics (computer-assisted sperm analysis), plasma membrane integrity, chromatin integrity, acrosome status, mitochondrial activity, lipid peroxidation and hormone [luteinizing hormone (LH) and testosterone] serum concentration. The results showed that Wagyu had lower total motility and an increased number of sperm with no motility when compared with Nellore and Angus bulls. Wagyu breed did not differ from those breeds when considering plasma and acrosome membranes integrity, mitochondrial potential, chromatin resistance, sperm lipid peroxidation or hormone (LH and testosterone) concentrations. We concluded that Wagyu sires had lower total motility when compared with Nellore and Angus bulls. Wagyu breed did not differ from these breeds when considering plasma and acrosome membranes integrity, mitochondrial potential, chromatin resistance, sperm lipid peroxidation, or hormone (LH and testosterone) concentrations.
已知和牛公牛具有高度亢进的性欲，幼崽强烈的性兴趣就表明了这一点。因此我们认为，和牛雄性动物具有专门的支持细胞和间质细胞，这与该品种的性早熟直接相关，因为成年公牛的阴囊周长较小。本研究旨在评估和牛公牛与其他亚种及种公牛相比，在激素和精子特征方面是否存在差异。对来自和牛、内洛尔牛和安格斯种公牛的冻融精液进行了精子动力学（计算机辅助精子分析）、质膜完整性、染色质完整性、顶体状态、线粒体活性、脂质过氧化以及激素[促黄体生成素（LH）和睾酮]血清浓度的分析。结果表明，与内洛尔牛和安格斯公牛相比，和牛的总活力较低，无活力精子数量增加。在考虑质膜和顶体膜完整性、线粒体电位、染色质抗性、精子脂质过氧化或激素（LH和睾酮）浓度时，和牛品种与其他品种没有差异。我们得出结论，与内洛尔牛和安格斯公牛相比，和牛种公牛的总活力较低。在考虑质膜和顶体膜完整性、线粒体电位、染色质抗性、精子脂质过氧化或激素（LH和睾酮）浓度时，和牛品种与这些品种没有差异。
