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Research (Published online: 07-07-2015)

3.  Effect of thawing methods on frozen semen quality of yak (Poephagus grunniens L.) bulls - Binod Kumar Dutta Borah, Bharat Chandra Deka, Ranjan Kumar Biswas, Prithiviraj Chakravarty, Sourabh Deori, Sudip Sinha and Kutubuddin Ahmed

Veterinary World, 8(7): 831-834

 

 

   doi: 10.14202/vetworld.2015.831-834

 

Binod Kumar Dutta Borah: ICAR-National Research Centre on Yak, Dirang-790101, Arunachal Pradesh, India; beekeyvet@gmail.com

Bharat Chandra Deka: Department of Animal Reproduction, Gynaecology and Obstetrics, College of Veterinary Science, Assam Agricultural

University, Khanapara, Guwahati -781022, Assam, India; bcdeka@gmail.com

Ranjan Kumar Biswas: Department of Animal Reproduction, Gynaecology and Obstetrics, College of Veterinary Science, Assam Agricultural

University, Khanapara, Guwahati -781022, Assam, India; rkbiswascvsc@rediffmail.com

Prithiviraj Chakravarty: ICAR-National Research Centre on Yak, Dirang-790101, Arunachal Pradesh, India; drpcicar@gmail.com

Sourabh Deori: ICAR-National Research Centre on Yak, Dirang-790101, Arunachal Pradesh, India; sourabhd1@rediffmail.com

Sudip Sinha: Department of Animal Reproduction, Gynaecology and Obstetrics, College of Veterinary Science, Assam Agricultural University, Khanapara, Guwahati -781022, Assam, India; sinhasudip58@gmail.com

Kutubuddin Ahmed: Department of Animal Reproduction, Gynaecology and Obstetrics, College of Veterinary Science, Assam Agricultural

University, Khanapara, Guwahati -781022, Assam, India; kahmedj@gmail.com

 

Received: 28-02-2015, Revised: 01-06-2015, Accepted: 11-06-2015, Published online: 07-07-2015

 

Corresponding author: Sourabh Deori, e-mail: sourabhd1@rediffmail.com


Citation: Borah BKD, Deka BC, Biswas RK, Chakravarty P, Deori S, Sinha S, Ahmed K (2015) Effect of thawing methods on frozen semen quality of yak (Poephagus grunniens L.) bulls, Veterinary World 8(7): 831-834.



Aim: To evaluate different thawing temperatures and duration on the post-thaw semen quality of Indian yaks bulls.

Materials and Methods: Semen ejaculates from four different yak bulls were collected using artificial vagina method and extended with tris extender containing 6.4% glycerol at 35C, cooled gradually from 35C to 5C at 1C/3 min and equilibrated at 4-5C for 4 h and frozen in French mini straws using a programmable bio-freezer and finally stored in liquid nitrogen.Thawing of frozen semen straws was carried out using three methods i.e., 35C for 60 s (thawing method I), 37C for 30 s (thawing method II) and 75C for 9 s (thawing method III).The post-thaw semen quality parameters assessed were sperm motility, percent live sperm, hypo-osmotic swelling test (HOST)-reacted sperm, acrosomal changes, and alanine aminotransferase (ALT) and aspartate aminotransferase (AST) activities in the extracellular media.

Results: The percent sperm motility, total incidence of acrosomal changes, and extracellular release of AST varied significantly (p<0.01) between thawing methods but live sperm and HOST-reacted sperm did not vary significantly between thawing methods.The percent sperm motility of frozen yak semen for thawing method III was significantly (p<0.05) higher than that for thawing methods I and II, the difference between thawing methods I and II being non-significant. The critical difference test revealed that the total incidence of acrosomal changes and extracellular release of AST were significantly (p<0.05) lower when thawing was done using methods I and II than in method III.

Conclusion: On the basis of the present experiment, we can conclude that barring the post-thaw sperm motility, thawing of frozen yak semen in water either at 35C for 60 s or 37C for 30 s gives better post-thaw semen quality than at 75C for 09 s.

Keywords: acrosomal changes, post-thaw, thawing methods, semen quality, yak.



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