摘要
The objective of the present research was to determine the effect of long synchronization protocols based on reused progesterone devices (controlled internal drug release [CIDR]) associated with different doses of equine chorionic gonadotropin (eCG) on reproductive variables in crossbred sheep (Suffolk × Kathadin × Dorset). The CIDR were used for eleven days in a previous study in sheep from the same herd and were washed and disinfected before reusing. Sixty-four sheep, in the reproductive season, were randomly assigned to four experimental groups (n = 16). Treatments consisted of a group with 10 d CIDR and 300 IU eCG; a group with 10 d CIDR and 400 IU of eCG; a group with 12 d CIDR and 300 IU of eCG; and a group with 12 d CIDR and 400 IU of eCG. A completely randomized design was used. There was an estrous presentation rate of 100% in all treatments. The begining of estrous, gestation rate, fertility rate, type of parturition, and prolificacy index were equal between groups. Progesterone serum concentration was higher in sheep from the 10 d CIDR groups. The CIDR, reused for the second time, associated with 300 or 400 IU of eCG for estrous synchronization in sheep, are effective to obtain good pregnancy rates and ensures higher prolificacy rates.
摘要译文
本研究的目的是确定基于重复使用的孕酮装置（控制内部药物释放[CIDR]）和不同剂量的马绒毛膜促性腺激素（eCG）的长期同步方案对杂交绵羊（萨福克×凯瑟丁）繁殖变量的影响×多塞特郡）。在先前的研究中，CIDR在同一群羊中使用了11天，在重新使用之前要进行清洗和消毒。在繁殖季节，将六十四只绵羊随机分为四个实验组（n = 16）。治疗包括一组具有10 d CIDR和300 IU eCG的患者。一组具有10 d CIDR和400 IU eCG的小组；一个具有12 d CIDR和300 IU eCG的小组；以及一组12 d CIDR和400 IU eCG的小组。使用完全随机的设计。在所有治疗中，发情呈递率均为100％。各组之间的发情开始，妊娠率，受精率，分娩类型和多产指数均相等。 10 d CIDR组的绵羊的孕酮血清浓度较高。 CIDR第二次重新使用，与300或400 IU eCG联用，以使绵羊发情同步，可有效获得良好的妊娠率并确保较高的受精率。
LOPEZ-GARCIA; Susana et al.. Estrous synchronization in sheep with reused progesterone devices and eCG.[J]. Revista Brasileira de Zootecnia, 2021,50(50)