Martinez-Ros Paula, Rios-Abellan Alejandro, Gonzalez-Bulnes Antonio
Departamento de Produccion y Sanidad Animal, Facultad de Veterinaria, Universidad Cardenal Herrera-CEU, CEU Universities, C/ Tirant lo Blanc, 7, Alfara del Patriarca, 46115 Valencia, Spain.
Departamento de Reproduccion Animal, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Avda. Puerta de Hierro s/n. 28040 Madrid, Spain.
Animals (Basel). 2018 Dec 26;9(1):9. doi: 10.3390/ani9010009.
The present study characterizes, for sheep, the occurrence and timing of the onset of estrus behavior and ovulation and the yields obtained (ovulation rate, progesterone secretion, and fertility) after Controlled Internal Drug Release (CIDR) insertion for five, six, seven, or fourteen days, with or without equine chorionic gonadotrophin (eCG) in ewes of the Segureña meat breed. All the treatments showed above 80% of females displaying estrus, but the onset of estrus was earlier and more synchronized when using eCG and, among groups with eCG, onset of estrus was earlier in the sheep treated for 14 days than in the short-term treatments ( < 0.05 for all). Administration of eCG after either short- or long-term treatments assured the occurrence of fertile ovulations in all the animals. Conversely, ovulatory success without eCG was found to be dependent on treatment length, with a high percentage of animals ovulating after five days of treatment (83.3%) and very low percentages after treatment for six or seven days (40% and 20%, respectively). Ovulation rate and progesterone secretion were similar among animals ovulating, but ovulation failures predetermined the fertility yields obtained in response to the treatments. Hence, the best results were found after treatment for 14 days plus eCG, and for 5 days without eCG (83.3 for both, < 0.05 when compared to the other groups with different treatment lengths and with or without eCG).
本研究针对塞古雷纳肉用品种母羊，对在插入控制内释药物（CIDR）5天、6天、7天或14天，添加或不添加马绒毛膜促性腺激素（eCG）的情况下，发情行为和排卵的发生及起始时间，以及所获得的产出（排卵率、孕酮分泌和繁殖力）进行了表征。所有处理组中，超过80%的母羊表现出发情，但使用eCG时发情起始更早且更同步，并且在使用eCG的组中，接受14天处理的母羊发情起始比短期处理的母羊更早（所有比较均P<0.05）。短期或长期处理后给予eCG可确保所有动物都发生可育排卵。相反，未使用eCG时排卵成功率取决于处理时长，处理5天后有高比例的动物排卵（83.3%），而处理6天或7天后排卵比例非常低（分别为40%和20%）。排卵的动物之间排卵率和孕酮分泌相似，但排卵失败预先决定了处理所获得的繁殖力产出。因此，处理14天加eCG以及不使用eCG处理5天获得了最佳结果（两者均为83.3，与其他不同处理时长及添加或不添加eCG的组相比P<0.05）。
