Polygamy boosts mouse sperm fitness

时间:2019-03-07 02:07:01166网络整理admin

By Wendy Zukerman POLYGAMOUS mice make better sperm, backing up the theory that competition for mates increases male fertility. Leigh Simmons at the University of Western Australia in Crawley exploited the ability of house mice to swap between being polygamous and monogamous. First he created monogamous mice, by pairing 18 males and females, and interbreeding their offspring in more monogamous pairs. The experiment was repeated for 12 generations. To make a polygamous line, he sequentially mated females with three males each. Again he repeated this over 12 generations. Then came the sperm test: