Transient retardation in embryo growth in normal female mice made pregnant by males whose testes had been heated.

In three separate experiments, using three different strains of mice, when normal females were mated by males whose testes had been heated once to 42 degrees C for 20 min, the embryos at 10.5 days post-coitum were approximately 20% smaller than control embryos. In one experiment, the difference was still present, although proportionately less, at 15.

Semen quality and sperm output of Yankasa rams at different ages.

Three groups of three Yankasa rams aged 1.4, 2.4, and 3.