Hrymak, KhrystynaStakh, VovkSharan, Mykola2022-02-282022-02-282019Hrymak K., Stakh V., Sharan M. (2019). Fertilizing Ability of the Texel RaSires Thawed Sperm under Different Modes of Their Use. Folia Pomer. Univ. Technol. Stetin., Agric., Aliment., Pisc., Zootech. 2019, 348(49)1, 87–94. doi: 10.21005/AAPZ2019.49.1.092081-1284https://hdl.handle.net/20.500.12539/795The article presents the results of experimental studies on the effect of the quality of ram-sires’ thawed sperm during the breeding and non-breeding periods under different modes of using the breeders. It is established that the acrosome preservation under the mode of using the ram-sires to receive 4 ejaculates per week compared to 6 and 8 ejaculates during the nonbreeding period was higher by 3.5 and 6.0%, respectively, and by 2.5 and 5.0 percent during the breeding period. Kinetic parameters of sperm motion during both periods of seasonal activity were also higher under the mode of receiving 4 ejaculates per week by 2.6–14.0 percent on average. The fertilizing ability of thawed sperm from the first insemination of ewes under the mode of receiving 4 ejaculates per week compared to the above mentioned modes was higher by 3.2 and 7.2% during the non-breeding period, and by 7.3 and 10.6% during the breeding period; while fertility at lamb birth – by 1.7 and 3.8%, and by 1.0 and 8.1 percent, respectively.enUznanie autorstwa-Użycie niekomercyjne 3.0 Polskaram-sireseweslambsmodes of useperiods of seasonal activitythawed spermacrosomekinetic parametersfertilityDyscyplina::Nauki rolniczeArticle10.21005/AAPZ2019.49.1.092300-5378