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              Research 
              
              
(Published online: 
              12-08-2015) 
              
              7.  
              
              Comparison of follicular dynamics, superovulatory response, and 
              embryo recovery between estradiol based and conventional 
              superstimulation protocol in buffaloes (Bubalus bubalis) 
              - 
              
              Narinder Singh, G. S. Dhaliwal, V. S. Malik, D. Dadarwal, M. 
              Honparkhe, S. Singhal and P. S. Brar 
              
              Veterinary World, 8(8): 983-988   
              
   
                
                
doi: 
              10.14202/vetworld.2015.983-988   
              Narinder Singh: 
              
              Department of Veterinary Gynaecology and Obstetrics, Guru Angad 
              Dev Veterinary and Animal Sciences University,  Ludhiana, 
              Punjab, India; narinder2002us@yahoo.com 
              G. S. Dhaliwal:
              
              
              Department of Teaching Veterinary Clinical Complex, Guru Angad Dev 
              Veterinary and Animal Sciences University, Ludhiana, Punjab, 
              India; 
              
              dr.dhaliwal1960@rediffmail.com 
              V. S. Malik: 
              
              Department of Veterinary Gynaecology and Obstetrics, Guru Angad 
              Dev Veterinary and Animal Sciences University,  Ludhiana, 
              Punjab, India; vsmalik11@gmail.com 
              D. Dadarwal:
              
              Large 
              Animal Clinical Sciences, Western College of Veterinary Medicine, 
              University of Saskatchewan, Saskatoon, Canada; 
              
              dadarwaldinesh@gmail.com 
              M. Honparkhe: 
              
              Department of Veterinary Gynaecology and Obstetrics, Guru Angad 
              Dev Veterinary and Animal Sciences University,  Ludhiana, 
              Punjab, India; honparkhem@rediffmail.com 
              S. Singhal: 
              
              Department of Veterinary Gynaecology and Obstetrics, Guru Angad 
              Dev Veterinary and Animal Sciences University,  Ludhiana, 
              Punjab, India; drsinghalvet@gmail.com 
              P. S. Brar: Department of Veterinary 
              Gynaecology and Obstetrics, Guru Angad Dev Veterinary and Animal 
              Sciences University,  Ludhiana, 
              Punjab, India;
              
              parkashbrar@gmail.com   Received: 
              06-05-2015, Revised: 10-07-2015, Accepted: 16-07-2015, Published 
              online: 12-08-2015    
              
              
              Corresponding author: 
              
              Narinder Singh, e-mail: narinder2002us@yahoo.com 
 
              Citation:Singh 
              N, Dhaliwal GS, Malik VS, Dadarwal D, Honparkhe M, Singhal S, Brar 
              PS (2015) Comparison of follicular dynamics, superovulatory 
              response and embryo recovery between estradiol based and 
              conventional superstimulation protocol in buffaloes (Bubalus 
              bubalis), Veterinary World 8(8): 983-988. 
 
              Abstract 
 
              Aim: To evaluate the 
              follicular dynamics, superovulatory response, and embryo recovery 
              following superstimulatory treatment initiated at estradiol-17β 
              induced follicular wave emergence and its comparison with 
              conventional superstimulatory protocol in buffaloes.  
              Materials and Methods: Six normal cycling pluriparous 
              buffaloes, lactating, 90-180 days post-partum, and weighing 
              between 500 and 660 kg were superstimulated twice with a 
              withdrawal period of 35 days in between two treatments. In 
              superstimulation protocol-1 (estradiol group) buffaloes were 
              administered estradiol-17β (2 mg, i.m.) and eazibreed controlled 
              internal drug release (CIDR) was inserted intravaginally (day=0) 
              at the random stage of the estrous cycle. On the day 4, buffaloes 
              were superstimulated using follicle stimulating hormone (FSH) 400 
              mg, divided into 10 tapering doses given at 12 hourly intervals. 
              Prostaglandin F2α analogs (PGF2α) was administered at day 7.5 and 
              day 8, and CIDR was removed with the second PGF2α injection. In 
              superstimulation protocol - 2 (conventional group) buffaloes were 
              superstimulated on the 10th day of the estrous cycle with same FSH 
              dose regimen and similar timings for PGF2α injections. In both 
              groups, half of the buffaloes were treated with luteinizing 
              hormone (LH) 25 mg and other half with 100 ug buserelin; 
              gonadotrophin releasing hormone (GnRH) analog at 12 h after the 
              end of FSH treatment. All buffaloes in both protocols were 
              inseminated twice at 12 and 24 h of LH/GnRH treatment. Daily 
              ultrasonography was performed to record the size and number of 
              follicles and superovulatory response. Results: Significantly higher number of small follicles (<8 
              mm) was present at the time of initiation of superstimulatory 
              treatment in the estradiol group compared to the conventional 
              group (12.5±0.80 vs. 7.3±1.21, respectively, p=0.019), however, 
              the number of ovulatory size follicles (≥8 mm) did not differ 
              significantly between the respective groups (15.5±1.24 vs. 
              12.2±1.30; p=0.054). Total embryos and transferable embryos 
              recovered were non-significantly higher in the estradiol group 
              compared to the conventional group (5.83±0.86 vs. 4.67±1.16, 
              p=0.328, and 3.67±0.93 vs. 2.67±0.68, p=0.437, respectively). The 
              significant higher proportion of transferable embryos were 
              recovered in buffaloes treated with LH compared to GnRH (73.3% vs. 
              48.5%; p=0.044).
 Conclusion: The average number of ovulatory size follicles 
              (>8 mm), corpora lutea, and transferable embryos was higher in 
              buffaloes superstimulated at estradiol-induced follicular wave 
              compared to the conventional protocol: Further the percentage of 
              transferable embryos was significantly higher in buffaloes 
              administered with LH compared to GnRH.
 Keywords: buffalo, embryo, estradiol-17β, superstimulation, 
              ovulation rate.
 
 
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