The influence of mode of use and period of seasonal activity on quantitative and qualitative indicators of Oxford Down ram-sires’ sperm productivity

  • K. Hrymak Institute of Animal Biology NAAS, Lviv, Ukraine
Keywords: ram-sires, mode of use, periods of seasonal activity, freshly collected and deconserved sperm, quantitative and qualitative indicators of sperm productivity, cryoconservation

Abstract

The results of experimental studies of quantitative and qualitative indicators of sperm in different modes of ram-sires’ use  for  4, 6 and 8 ejaculates per week, in  the non-breeding and breeding periods are presented. It was proved that in the non-breeding period in the mode of collecting 4 ejaculates per week compared to 6 and 8 ejaculates, the volume of ejaculate was higher by 3,4 and 17,2 %, respectively, the concentration of sperm by 4,3 and 10,2 %, the activity of freshly collected sperm by 0,8 and 2,8%, activity of deconserved sperm by 3,0 and 7,6 %, their resistance to freezing by 9,6 and 20,6 %,  survival by 6,0 and 14,4 % and absolute survival rate by 3,8 and 10,3 %. During the breeding period in the same mode, the volume of ejaculate was greater by 10,3 % and 22,6 %, the concentration of sperm by 7,1 % and 16,7 %, the the activity of freshly collected sperm by 3,6 and 9,6%, activity of deconserved sperm by 5,4 and 10,8 %, their resistance to freezing  by 7,9 and 17,1 %,  survival by 4,1 and 11,5 and absolute survival rate by 3,1 and 5,6 %. It was experimentally confirmed that in the breeding period compared with the non-breeding one, the studied indicators of fresh and deconserved sperm, were significantly higher from 12,4 % to 45,6 % for the fresh sperm, and from 4,5 % to 16,5 percent for the cryopreserved one. The conducted studies showed that the sperm is biologically valuable  in both periods of seasonal activity in the mode of collecting 4 ejaculates per week, and its qualitative indicators comply with the requirements for artificial insemination of sheep.

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Published
2019-09-18
How to Cite
Hrymak, K. (2019). The influence of mode of use and period of seasonal activity on quantitative and qualitative indicators of Oxford Down ram-sires’ sperm productivity. Scientific and Technical Bulletin оf State Scientific Research Control Institute of Veterinary Medical Products and Fodder Additives аnd Institute of Animal Biology, 20(2), 339-345. https://doi.org/10.36359/scivp.2019-20-2.44