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              Open Access  
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              Research 
              
              
(Published online:  
              
              25-02-2015) 
              
              20.
              
              Relative efficacy of egg yolk and soya milk-based extenders for 
              cryopreservation (−196°C) of buffalo semen - 
              D.V. Chaudhari, A. J. 
              Dhami, K. K. Hadiya and J. A. Patel 
              
              Veterinary World, 8(2): 239-244   
              
   
                
                
doi: 
              10.14202/vetworld.2015.239-244   D.V. 
              Chaudhari: 
              
              Sabarmati Ashram Gaushala, Ahmedabad, Gujarat, India;
              
              
              dvchaudhari@sagbidaj.org A. J. 
              Dhami: 
              Department of Animal Reproduction, Gynaecology and Obstetrics, 
              College of Veterinary Science and Animal Husbandry, Anand 
              Agricultural University, Anand, Gujarat, India;
              
              
              ajdhami@aau.in K. K. 
              Hadiya: 
              Department of Animal Reproduction, Gynaecology and Obstetrics, 
              College of Veterinary Science and Animal Husbandry, Anand 
              Agricultural University, Anand, Gujarat, India;
              
              
              kamleshhadiya@yahoo.co.in J. A. 
              Patel: 
              Department of Animal Reproduction, Gynaecology and Obstetrics, 
              College of Veterinary Science and Animal Husbandry, Anand 
              Agricultural University, Anand, Gujarat, India; japatel@aau.in   Received: 
              28-10-2014, Revised: 03-01-2015, Accepted: 12-01-2015, Published 
              online: 25-02-2015    
              
              
              Corresponding author:A. J. Dhami, email: ajdhami@aau.in 
 
              Citation:
              Chaudhari DV, 
              Dhami AJ, Hadiya KK, Patel JA (2015) Relative efficacy of egg yolk 
              and soya milk-based extenders for cryopreservation (−196°C) of 
              buffalo semen, Veterinary World 8(2): 239-244. 
 
              Abstract 
 Aim:
              The aim was to compare commercially available soybean 
              milk-based extenders, viz. Bioxcell® 
              and Optixcell® (IMV, France) with standard 
              Tris-citrate-fructose-egg yolk-glycerol (TFYG) extender for 
              cryopreservation of buffalo semen. 
              Materials and Methods: Semen was collected 
              twice a week in artificial vagina from six sexually mature, 4-6 
              years old, healthy breeding bulls of Surti buffalo breed. In all 
              48 qualifying ejaculates (8 per bull) having initial motility >70% 
              were split into three equal aliquots and were diluted (at 34°C 
              keeping 100×106 sperm ml−1) 
              in TFYG, Bioxcell and Optixcell extenders. The French mini straws 
              filled from each aliquot were gradually cooled to 4-5°C, 
              equilibrated at 4°C for 4 h and frozen in liquid nitrogen 2 vapor 
              using programmable biofreezer. Just before freezing 
              (post-equilibration) and 24 h after frozen storage, the samples 
              were evaluated for various sperm quality parameters using standard 
              protocols. Frozen semen straws were thawed in a water bath at 37°C 
              for 30 s. The post-thaw incubation survival (37°C for 1 h) was 
              assessed through motility rating at 0, 30 and 60 min of 
              incubation. 
              Results: The mean percentages of prefreeze sperms in TFYG, 
              Bioxcell and Optixcell extenders in terms of progressive motility 
              (69.48±0.37, 68.02±0.49, 70.94±0.38), viability (79.21±0.39, 
              77.38±0.48, 81.58±0.38), total abnormalities (7.90±0.14, 
              8.60±0.16, 7.08±0.15), intact acrosome (89.54± 0.18, 88.58±0.22, 
              90.52±0.21) and hypoosmotic swelling (HOS) reactivity (67.96±0.32, 
              65.65±0.42, 70.23±0.37) varied significantly (p<0.05) between 
              extenders. Similar pattern of significant (p<0.05) variations 
              between these extenders for post-thaw sperm progressive motility 
              (47.71±0.79, 44.38±0.85, 49.90±0.90), viability (57.19±0.79, 
              53.85±0.84, 59.67±0.91), total abnormalities (12.33±0.17, 
              12.75±0.21, 11.27±0.18), intact acrosome (76.83±0.23, 75.90± 0.27, 
              78.50±0.25) and HOS reactivity (45.02±0.84, 42.31±0.82, 
              47.81±0.90) was also observed for TFYG, Bioxcell and Optixcell 
              extenders. The recently launched improved soybean milk-based 
              extender Optixcell excelled the older Bioxcell extender and even 
              standard TFYG in respect of some of the sperm quality parameters.
               
              Conclusion: The advantages of soy lecithin-based bovine semen 
              extenders over egg yolk regarding sanitary issues are 
              unquestionable but still egg yolk-based semen extenders are widely 
              used because of the cost factor and good in vivo fertility 
              results. 
              Keywords: buffalo semen, cryopreservation, 
              extenders, egg yolk, relative efficacy, soybean milk. 
 
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