冬春两季的精子质量较高

Israeli scientists studied samples from more than 6,000 men who were being treated for infertility. They found sperm in greater numbers, with faster swimming speeds, and fewer abnormalities, in semen made during the winter. The sperm declined steadily in quality from spring onwards. The researchers say this may explain why there are so many babies born in the autumn.
以色列科学家对6000名以上患有生育方面疾病的男子进行抽样研究，发现冬季产生的精子在数量和游泳速度方面都优于其它季节，畸形情况也比较少。而自进入夏季，精子质量就开始全面下降。研究人员声称，这也是很多小孩在秋季出生的原因。

The reason why sperm appears to be healthier in winter isn't yet clear. One theory is sperm is affected by warn temperatures.
但是，研究人员还并未完全明白冬季精子质量高的原因。一种可能的解释是较高的温度对精子会有不利的影响。

In animal studies, seasonal changes in sperm production and fertility have been linked to factors ranging from temperature, to length of daylight exposure and hormone variations.
研究人员在对动物的研究中就发现温度变化和精子的产生与生育能力大有关系。当然季节规律对于那些精子排出规律反常的男子来说不会有什么影响。

Writing in the American Journal of Obstetrics & Gynaecology, the researchers said that if there is a seasonal pattern, that knowledge may ‘be of paramount importance, especially in couples with male-related infertility struggling with unsuccessful and prolonged fertility treatments.’
之前有研究证明当今世界，男性的精子数量正在日益下降。在不清楚确切原因的情况下，人们普遍认为是现代社会久坐不动的生活方式影响了精子质量。