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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;

M. Kafi: Department of Animal Reproduction, Faculty of Veterinary Medicine, Shiraz University, Shiraz, Iran;

Adel Mokhtari: Department of Animal Reproduction, Faculty of Veterinary Medicine, Shiraz University, Shiraz, Iran;

M. Heidari: Department of Animal Clinical Science, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran;


Received: 18-11-2014, Revised: 13-04-2015, Accepted: 21-04-2015, Published online: 22-05-2015


Corresponding author: Adel Mokhtari, e-mail:

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.

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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