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Efficiency of different hormonal treatments for estrus synchronization in tropical Santa Ins sheep

机译：不同激素治疗对热带圣塔因斯绵羊发情同步的功效

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The aim of this study was to evaluate the effect of (i) the duration of hormone treatment with progestogen sponges during the seasonal anestrus and (ii) the administration of two doses of prostaglandin at 7 days apart during the breeding season on reproductive parameters of Santa Ins ewes. In experiment 1, 32 ewes received intravaginal MAP sponges for 6 (G(6 days)), 9 (G(9 days)), or 12 (G(12days)) days and 75 mu g d-cloprostenol i.m. and 300 IU eCG i.m. 1 day before sponge removal. In experiment 2, 23 ewes received two doses of 0.48-mg sodium cloprostenol i.m. 7 days apart. Ovarian follicular dynamic was assessed through transrectal ultrasonography. Blood samples were collected daily to determine progesterone concentrations. In experiment 1, estrus and ovulation rates did not differ (P > 0.05) among protocols and between cyclic and acyclic ewes at the beginning of the experiment. The G(9 days) treatment showed a lower dispersion of ovulations in relation to onset of estrus when compared to G(6 days) and G(12 days). In experiment 2, all ewes exhibit estrus and ovulated after the second dose of prostaglandin, although ewes that were in diestrus at D0 showed subluteal concentrations of progesterone during the follicle development stage of the treatment. In conclusion, the use of progestogen device during 9 days promotes lower dispersion of ovulation when compared to its use for 6 or 12 days, and the protocol of two doses of prostaglandin 7 days apart synchronizes estrus efficiently but results in follicular development under low progesterone concentrations.
机译：这项研究的目的是评估（i）在季节性发情期使用孕激素海绵进行激素治疗的持续时间，以及（ii）在繁殖季节间隔7天服用两次剂量的前列腺素对圣诞老人的生殖参数的影响母羊。在实验1中，32头母羊接受阴道内MAP海绵治疗6天（G（6天）），9天（G（9天））或12天（G（12天））和75微克d-氯前列醇i.m.和300 IU eCG i.m.去除海绵前1天。在实验2中，有23头母羊在i.m.接受了两剂0.48-mg氯前列腺素钠。相隔7天。通过经直肠超声检查评估卵巢卵泡动力学。每天采集血样以确定孕酮浓度。在实验1中，实验开始时，协议之间以及环状和非环状母羊之间的发情和排卵率没有差异（P> 0.05）。与G（6天）和G（12天）相比，G（9天）治疗显示相对于发情发作而言，排卵的分散性较低。在实验2中，所有母羊均表现出发情状态，并在第二剂前列腺素后排卵，尽管在D0处处于发情期的母羊在卵泡发育阶段的黄体酮浓度低于孕酮。总之，与使用6天或12天相比，使用9天的孕激素装置可促进排卵的分散，并且两剂前列腺素间隔7天的方案可有效同步发情，但在低孕酮浓度下可导致卵泡发育。

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