Increased daily sperm production in the breeding season of stallions is explained by an elevated population of spermatogonia.
Increased daily sperm production in the breeding season of stallions is explained by an elevated population of spermatogonia.
复制标题
种马繁殖季节每日精子产量增加的原因是精原细胞数量增加。
DOI：
10.1095/biolreprod32.5.1181
复制
发表时间：
1985
影响因子：
3.6
通讯作者：
Johnson,L
中科院分区：
文献类型：
--
作者：
Johnson,L
本研究评估了种马精原细胞数量和生殖细胞退化的季节性变化，以确定每睾丸（DSP/testis）或每g实质（DSP/g）每日精子产量的季节性差异。非繁殖期（12 - 1月）和繁殖期（6 - 7月）各有28头成年种（4 ~ 20岁），A型精原细胞数量在繁殖期增加了2倍以上（P<0.01）。B型精原细胞数量在繁殖季节也有所增加（P<0.01），而B型精原细胞/ A型精原细胞数量在不同季节之间基本持平（P< 0.05）。从B型精原细胞到长核精母细胞，各细胞类型的日精子产生量/睾丸比在非繁殖期均较低（P<0.01）。基于DSP/g，在非繁殖期减数分裂过程中出现了明显的退化。然而，当考虑DSP/睾丸时，潜在精子产量的减少并不显著（P>0.05）。在繁殖季节，B型精原细胞和原代精母细胞之间也发生了显著的生殖细胞退化。然而，A型精原细胞数量的增加足以克服这种退化，并解释了在种马繁殖季节精子产量的增加。
Seasonal variation in number of spermatogonia and germ cell degeneration was evaluated to determine which mechanism might explain seasonal differences in daily sperm production per testis (DSP/testis) or per g parenchyma (DSP/g) in stallions. Comparing 28 adult stallions (4 to 20 yr old) in each of the nonbreeding (December-January) and breeding (June-July) seasons, the population of type A spermatogonia was more than two times greater (P<0.01) in the breeding season. While the number of type B spermatogonia also was elevated (P<0.01) in the breeding season, the number of type B spermatogonia/type A spermatogonium was similar (P>0.05) between seasons. Daily sperm production/testis based on each cell type from type B spermatogonia to spermatids with elongated nuclei was lower (P<0.01) in the nonbreeding season. Based on DSP/g, there was significant degeneration during the meiotic divisions in the nonbreeding season. However, this reduction in potential spermatozoan production was not significant (P>0.05) when considering DSP/testis. Significant germ cell degeneration also occurred in the breeding season between type B spermatogonia and primary spermatocytes. However, the type A spermatogonial population was sufficiently elevated to override this degeneration and to explain elevated production of sperm in the breeding season of stallions.