Taktaz T, Kafi M, Mokhtari Adel, Heidari M
Department of Animal Clinical Science, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran.
Department of Animal Reproduction, Faculty of Veterinary Medicine, Shiraz University, Shiraz, Iran.
Vet World. 2015 May;8(5):640-4. doi: 10.14202/vetworld.2015.640-644. Epub 2015 May 22.
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.
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.
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.
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.
牛卵巢囊肿是现代奶牛群经济损失的常见原因。本研究的目的是评估在奶牛无法明确诊断卵巢囊肿类型时，使用人绒毛膜促性腺激素（hCG）、促性腺激素释放激素（GnRH）和氯前列醇的三种方案对繁殖反应的影响。
总共144头患有卵巢囊肿的泌乳奶牛被分为三组。在诊断时（第0天），第1组（传统方法，n = 47）的奶牛肌肉注射0.02 mg GnRH类似物（布舍瑞林）；第2组（n = 47）的奶牛肌肉注射0.02 mg布舍瑞林加500 μg氯前列醇；第3组（n = 50）的奶牛肌肉注射1500 IU hCG加500 μg氯前列醇。所有奶牛在第10天肌肉注射500 μg氯前列醇。
三组在治疗后恢复时间、受孕间隔、首次人工授精受孕率以及第70天和第100天的妊娠率方面均未发现统计学上的显著差异。
在奶牛中，同时使用hCG或GnRH与氯前列醇治疗卵巢囊肿似乎并不比单独使用GnRH的传统方法更具优势。此外，hCG和GnRH对患有卵巢囊肿的奶牛具有同等的治疗效果。
