| 
              
              
              Open Access  
Copyright: The authors. This article is an open access 
article licensed under the terms of the Creative Commons Attribution License 
 
 
(http://creativecommons.org/licenses/by/2.0) which permits unrestricted use, 
distribution and reproduction in any medium, provided the work is properly 
cited. 
 
              
              
              Research 
              
              
(Published online: 
              
              
              22-05-2015) 
              
              15. 
              
              Reproductive responses of dairy cows with ovarian cysts to 
              simultaneous human chorionic gonadotropin or gonadotropin-releasing 
              hormone and cloprostenol compared to gonadotropin-releasing 
              hormone alone treatment 
              - 
              T. 
              Taktaz, M. Kafi, Adel Mokhtari and M. Heidari 
              
              Veterinary World, 8(5): 640-644   
              
   
                
                
doi: 
              10.14202/vetworld.2015.640-644   
              T. Taktaz: Department 
              of Animal Clinical Science, Shahrekord Branch, Islamic Azad 
              University, Shahrekord, Iran; 
              
              Taghi_taktaz@yahoo.com 
              M. Kafi: Department of 
              Animal Reproduction, Faculty of Veterinary Medicine, Shiraz 
              University, Shiraz, Iran; 
              
              Kafi@shirazu.ac.ir 
              Adel Mokhtari:
              Department of 
              Animal Reproduction, Faculty of Veterinary Medicine, Shiraz 
              University, Shiraz, Iran; 
              
              adelmkh2008@yahoo.com 
              M. Heidari: Department 
              of Animal Clinical Science, Shahrekord Branch, Islamic Azad 
              University, Shahrekord, Iran; 
              
              milad391@yahoo.com   Received:
              18-11-2014, 
              
              Revised: 
              
              13-04-2015, Accepted:
              
              
              21-04-2015, Published 
              online: 
              
              22-05-2015   
              
              
              Corresponding author:Adel Mokhtari, e-mail: adelmkh2008@yahoo.com 
 
              Citation: Taktaz 
              T, Kafi M, Mokhtari A, Heidari M (2015) Reproductive responses of 
              dairy cows with ovarian cysts to simultaneous human chorionic 
              gonadotropin or gonadotropin releasing hormone and cloprostenol 
              compared to gonadotropin releasing hormone alone treatment, 
              Veterinary World 8(5):640-644. 
 
              Abstract 
 
              Aim: Bovine ovarian cysts 
              are a common cause of economic loss in modern dairy herds. The 
              objective of the present study was to evaluate the reproductive 
              responses to three protocols using hCG, GnRH and cloprostenol when 
              the definite diagnosis of the type of ovarian cyst is/is not 
              possible in dairy cows.  
              Materials and Methods: A total of 144 lactating dairy cows 
              with ovarian cysts were divided into three groups. At diagnosis 
              (Day 0), cows in Group 1 (the conventional method, n=47) were 
              injected with 0.02 mg of a GnRH analogue i.m. (Buserelin); cows in 
              Group 2 (n=47) were intramuscularly treated with 0.02 mg Buserelin 
              plus 500 μg cloprostenol; and cows in Group 3 (n=50) were 
              intramuscularly treated with 1500 IU hCG plus 500 μg cloprostenol. 
              All cows received 500 μg cloprostenol intramuscularly on Day 10.
               
              Results: No statistically significant differences were found 
              in the recovery time, interval to conception, conception rate at 
              first AI, and pregnancy rates by Days 70 and 100 after treatment 
              among the three groups.  
              Conclusions: Simultaneous treatment of ovarian cysts with hCG 
              or GnRH and cloprostenol appeared to have no advantage over the 
              conventional method, GnRH alone, in dairy cows. Furthermore, hCG 
              and GnRH have an equal therapeutic effect in cows with ovarian 
              cysts.  
              Keywords: cloprostenol, dairy cows, GnRH, hCG, ovarian cyst.
               
 
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