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首页> 外文期刊>The Bovine Practitioner >Effect of New and Reused CIDRs on Serum Progesterone Concentrations in Lactating Dairy Cows
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Effect of New and Reused CIDRs on Serum Progesterone Concentrations in Lactating Dairy Cows

机译：新的和重复使用的CIDR对泌乳奶牛血清孕酮浓度的影响

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摘要

Despite the common practice of re-using a popular intravaginal progesterone releasing device by United States cattle producers, there is little published scientific evidence whether this practice is effective as an aid in synchronizing estrus. We compared baseline serum progesterone concentrations in healthy lactating dairy cows to serum progesterone concentrations following insertion of new intravaginal progesterone releasing devices (1.38 g CIDR) and to concentrations following reuse of the same intravaginal progesterone releasing devices in the same cows. Under the conditions of the study, there was a significant decrease in serum progesterone concentrations following insertion of used CIDRs when compared to serum progesterone concentrations following insertion of new CIDRs. Serum progesterone concentrations associated with used CIDRs were statistically similar to baseline progesterone concentrations obtained from study cows before new CIDR insertion. Results of this study indicate there was either significant loss of progesterone in the CIDR insert after one use or there was decreased absorption of progesterone available from the used CIDRs. Based on the findings of the current study, reuse of 1.38 g CIDRs to aid in synchronization of estrus in lactating dairy cattle cannot be recommended.
机译：尽管美国养牛者普遍重复使用流行的阴道内孕激素释放装置，但很少有公开的科学证据证明这种作法是否能有效地使发情同步。我们将健康泌乳奶牛的基线血清孕酮浓度与新的阴道内孕激素释放装置（1.38 g CIDR）插入后的血清孕酮浓度以及在相同母牛中重复使用相同阴道内孕酮释放装置后的浓度进行了比较。在研究条件下，与插入新CIDR后的血清孕酮浓度相比，插入使用过的CIDR后的血清孕酮浓度显着降低。与使用过的CIDR相关的血清孕酮浓度在统计学上与新CIDR插入前从研究母牛获得的基线孕酮浓度相似。这项研究的结果表明，一次使用后，CIDR插入物中的孕酮大量丢失，或者使用过的CIDR中的孕酮吸收减少。根据当前研究的结果，不建议重复使用1.38 g CIDR来帮助泌乳奶牛发情同步。

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