Van Zelst, S.Zupp, J.Hayman, D.Setchell, B.2006-07-052006-07-051995Reproduction Fertility and Development, 1995; 7(5):1117-11211031-36131448-5990http://hdl.handle.net/2440/11503Heating the testes, scrota and tails of mice and rats by immersion in a water bath at 42 degrees C for 20 min caused an increased percentage of X-Y univalents in meiotic preparations made after 6 and 12 days respectively. It was also confirmed that exposing mice of a cool-adapted strain to an environment at 33 degrees C for 5 days resulted in an increase in the percentage of X-Y and autosomal univalents in meiotic preparations made after a recovery period of 2 days. Mice of a strain adapted to living at 33 degrees C also showed a higher rate of X-Y dissociation than control cool-adapted mice, but a lower frequency of autosomal univalents than cool-adapted mice exposed to the hot environment. The testes of the heat-adapted mice were even more sensitive than the testes of cool-adapted mice to the effects of local heating, as judged by the fall in testis weight 21 days afterwards.en© CSIRO 1995TestisSpermatozoaX ChromosomeY ChromosomeAnimalsMiceRatsRats, WistarSex Chromosome AberrationsBody TemperatureMeiosisMaleHot TemperatureJournal article0030004267001995170910.1071/RD9951117A1995TX5870001968273