Leto S, Frensilli F J
Fertil Steril. 1981 Dec;36(6):766-70. doi: 10.1016/s0015-0282(16)45923-6.
Effective contraception and easily available abortion have contributed to the decline of adoptable children. This decline has resulted in a marked increase in the demand for AID. The provider of donor semen must establish minimal semen criteria to meet this demand effectively. During the past 8 years the authors have found a declining trend in several parameters of donor semen. Sperm count has decreased steadily, but not motility. Forward progression, viability, and morphologic characteristics have also shown a declining trend. The authors have had to reject a greater number of potential candidates in each ensuing year to exceed their minimal semen criteria. Despite the higher rejection rate, the authors have not been able to maintain the higher sperm parameters seen in the earlier years. The authors project that in 5 or 6 years, if the trend continues, no potential donor will meet their current minimal standards.
有效的避孕措施和便捷的人工流产导致了可供收养儿童数量的减少。这种减少导致对供体人工授精（AID）的需求显著增加。供精者必须制定最低精液标准，以有效满足这一需求。在过去8年里，作者发现供体精液的几个参数呈下降趋势。精子数量稳步减少，但活力并未下降。向前运动能力、存活率和形态特征也呈下降趋势。在随后的每一年里，作者不得不拒绝更多的潜在供体，以便使其精液超过最低标准。尽管拒绝率较高，但作者仍未能维持早年所见到的较高精子参数。作者预计，如果这种趋势持续下去，5到6年后，将没有潜在供体能达到他们目前的最低标准。
