[Heat sensitivity of starred sturgeon follicles at different stages of their maturation period].

The influence of sharp temperature shift and proportioned keeping of the sevryuga females at a low temperature on the oocyte maturation and ovulation has been studied. The reaction of the follicles to similar influences was shown to differ at different stages of the period of maturation inertia: the follicles remained intact at the stages prior to the germinal vesicle (oocyte nucleus) breakdown, were damaged in a part of females at the prometa- and metaphase I and in the most females at the prometa- and metaphase II. The injection of triiodothyronine to the females subjected to cooling at different stages of the period of maturation inertia exerted no effect on the oocyte ovulation and the egg fertilizability.