Entity

Time filter

Source Type


Zhang X.,Huazhong University of Science and Technology | Zhang X.,Family Planning Research Institute of Zhejiang | Zhou Y.,Zunyi Medical College | Xia W.,Huazhong University of Science and Technology | And 4 more authors.
Andrologia | Year: 2012

We evaluated the effects of sperm concentration, progressive motility, sperm morphology, duration of abstinence and collection season on the progressive motility recovery rate of human frozen spermatozoa to identify characteristics that predict the progressive motility recovery rate of human frozen spermatozoa and improve the protocol for sperm collecting in sperm banks. A total of 14 190 semen samples donated at Zhejiang human sperm bank of China between September 2006 and June 2011 were collected from 1624 donors. Semen was evaluated according to WHO standard procedures for sperm concentration. Progressive motility, sperm morphology, ejaculate collection season and abstinence time were recorded. After freezing and thawing, the progressive motility was assessed. Results showed that sperm concentration, progressive motility and normal morphology were significantly associated with the progressive motility recovery rate of human frozen spermatozoa. In addition, the abstinence time and collection season also significantly affected progressive motility recovery rate. Our results indicated that sperm concentration, progressive motility and normal morphology could be valuable in predicting the progressive motility recovery rate of human frozen spermatozoa. As such, progressive motility recovery may be improved by donating semen when abstinent for 3-5 days and during seasons other than summer. © 2012 Blackwell Verlag GmbH. Source


Zhang X.-Z.,Family Planning Research Institute of Zhejiang | Liu J.-H.,Zhengzhou University | Sheng H.-Q.,Family Planning Research Institute of Zhejiang | Wu H.-J.,Family Planning Research Institute of Zhejiang | And 4 more authors.
Andrology | Year: 2013

Summary: In this study, we assessed the effect of seasonal variation on the semen quality in Chinese by using the average highest temperature (AHT) of the ejaculation day for partitioning season periods. A total of 13 635 semen samples were collected and analysed according to the AHT of the ejaculation day. Semen volume, sperm concentration and the percentage of spermatozoa with normal morphology in midsummer (AHT > 30 °C) were significantly lower than those in other periods of the year. Sperm motility with AHT 10-20 °C in winter and spring was significantly higher than that in other seasons. The percentage of head defects spermatozoa with AHT < 10 °C in winter was significantly lower than that in other periods. We observed that there was a significant effect of season on the semen parameters. Highest environment temperature of the day may be a determining factor for the seasonal variations in semen quality. © 2013 American Society of Andrology and European Academy of Andrology. Source

Discover hidden collaborations