This study assessed the cervical ultrasonography mapping as a tool to select donor ewes for non‐surgical embryo recovery (NSER). Lacaune ewes had their cervix evaluated by ultrasonography 12 hr after induced oestrus onset (Trial 1, n = 24) or 30 min before NSER (Trial 2, n = 17). Cervical rings were longitudinally evaluated and classified by their degree of misalignment on ultrasonography (DMUS) into: DMUS‐1—cervix rectilinear, DMUS‐2—intermediate and DMUS‐3—highly asymmetrical. For predicting cervical transposing, only DMUS‐1 and DMUS‐2 were considered suitable. Similar ranking was attributed to degree of misalignment on the cervical map (DMCM 1–3), established immediately before NSER, which was performed at days 6 to 7 after oestrus. In Trial 1, cervical retraction for NSER was not possible only in three ewes classified as DMUS‐3 (3/14, 21.4%). No difference (p > .05) was observed in the cervical transposing rates between ewes with different DMUS (ranged from 80% to 100%). In Trial 2, DMUS‐1 and DMUS‐2 reached 100% of transposing, and the only DMUS‐3 ewe has not been transposed. In Trial 1, the prediction performance for successful cervical transposing showed low sensitivity (45%) and no specificity due to a high incidence of false negatives (52%). However, in Trial 2, sensitivity and specificity were both 100%. The DMCM and DMUS were uncorrelated, probably due to cervical stretching required to perform NSER. In conclusion, cervical ultrasound assessment immediately before NSER was more efficient to predict the cervical transposing than at induced oestrus, allowing the classification and selection of ewes eligible for NSER.

中文翻译：

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宫颈超声检查：选择母羊进行非手术胚胎恢复的工具。

这项研究评估了宫颈超声图谱作为选择供体母羊进行非手术胚胎恢复（NSER）的工具。拉科讷母羊有他们的子宫颈超声12小时评价诱导发情发作后（试验1，Ñ  = 24）或NSER（试验2前30分钟，Ñ = 17）。对颈环进行纵向评估，并根据其在超声检查（DMUS）上的未对准程度将其分类为：DMUS-1-子宫颈直线形，DMUS-2-中间和DMUS-3-高度不对称。为了预测宫颈移位，只有DMUS-1和DMUS-2被认为是合适的。类似的排名归因于在NSER之前即在发情后第6至7天进行的子宫颈定位图（DMCM 1-3）上未对准的程度。在试验1中，仅在分类为DMUS-3的三只母羊中无法对NSER进行颈椎缩回（3/14，21.4％）。无差异（p > 0.05）在具有不同DMUS的母羊之间的子宫颈换位率（范围从80％到100％）中被观察到。在试验2中，DMUS-1和DMUS-2达到了转置的100％，而唯一的DMUS-3母羊尚未被转置。在试验1中，成功进行宫颈移位术的预测性能显示出较低的敏感性（45％），并且由于假阴性的发生率较高（52％）而没有特异性。但是，在试验2中，敏感性和特异性均为100％。DMCM和DMUS是不相关的，可能是由于进行NSER所需的宫颈拉伸。总而言之，在进行NSER之前立即进行宫颈超声评估比诱导发情时更有效地预测宫颈移位，从而可以对符合NSER要求的母羊进行分类和选择。