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Information × Registration Number 0226U001917, (0121U100151) , R & D reports Title Research the biological mechanisms of mammalian reproductive function under the influence of seasonal factors popup.stage_title Дослідити біологічні механізми репродуктивної функції ссавців за дії сезонних чинників Head Lobachova Iryna V, Кандидат сільськогосподарських наук Registration Date 03-02-2026 Organization MF Ivanov Askania-Nova Institute of Steppe Animal Husbandry - National Scientific Breeding and Genetics Center for Sheep Breeding popup.description1 Research the features of biological mechanisms of mammals reproduction, their relationship with seasonal factors and on the basis of the received knowledge to develop new seasonally adjusted ways and methods for regulating the sheep reproduction popup.description2 The degree of correlation between reproduction indicators and indices of seasonal renewal of sexual activity of ewes with air temperature and humidity of different months during keeping of animals in natural light conditions was established, with revealing that the specified climatic parameters of May-June can significantly affect the quality and duration of seasonal renewal of sexual activity. The change in semen parameters of rams during the year was experimentally investigated, establishing that the quality indicators of sperm production of breeding rams show dependence on the age of animals and the season of obtaining sperm. The positive effect of the artificial gestagenization procedure on the readiness of ewes for mating when applied before the natural renewal of sexual activity was experimentally investigated and established. Based on the study of the effect of adding different types of substances to the cryoprotective solutions and different temperature regimes of sperm storage on their survival and resistance to freezing at two-stage dilution, a shortened (45–60 minutes versus 240–300 minutes with the traditional method) procedure for preparing sperm for freezing without worsening sperm motility after thawing has been developed. Product Description popup.authors Lobachova Iryna V. Dzhus Pavlina P. Сушко Алексей Борисович Yakovchuk Viktor Stanislavovych popup.nrat_date 2026-02-03 Close