title: 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.
abstract: OBJECTIVE
  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.
  
  
  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.
authors.affiliation: Department of Animal Clinical Science, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran.
authors.forename: T
authors.initials: T
authors.lastname: Taktaz
authors.affiliation: Department of Animal Reproduction, Faculty of Veterinary Medicine, Shiraz University, Shiraz, Iran.
authors.forename: M
authors.initials: M
authors.lastname: Kafi
authors.affiliation: Department of Animal Reproduction, Faculty of Veterinary Medicine, Shiraz University, Shiraz, Iran.
authors.forename: Adel
authors.initials: A
authors.lastname: Mokhtari
authors.affiliation: Department of Animal Clinical Science, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran.
authors.forename: M
authors.initials: M
authors.lastname: Heidari
keywords: GnRH; cloprostenol; dairy cows; hCG; ovarian cyst