Cecchetto Marta, Milani Chiara, Vencato Juri, Sontas Hasan, Mollo Antonio, Contiero Barbara, Romagnoli Stefano
Department of Animal Medicine Production and Health-University of Padova, via dell'Università 16, 35020 Legnaro, PD, Italy.
Department of Animal Medicine Production and Health-University of Padova, via dell'Università 16, 35020 Legnaro, PD, Italy.
Anim Reprod Sci. 2017 Sep;184:110-119. doi: 10.1016/j.anireprosci.2017.07.005. Epub 2017 Jul 12.
The aim of this work was to use a linear regression model previously developed in a pilot study to calculate days before parturition (DbP) using inner chorionic cavity (ICC), biparietal diameter (BPD), crown-rump length (CRL), body diameter (BD) and deep portion of telencephalic vesicle (DPTV) in German shepherd dogs (GSD) with known ovulation day and then to test that model in bitches with unknown ovulation day. In our current study, a model for GSD bitches published in a previous report, proved satisfactory for ICC [DbP=44.76-(4.34×ICC)] and BPD [DbP=38.65-(12.86×BPD)]. We therefore used their model, but developed a new one for CRL, BD and DPTV. For ICC and BPD, we tested accuracy for more than 35days before parturition (ICC) and more than 15days before parturition (BPD). Measurements were taken on at least two fetuses during each ultrasound recording (US) of 22 GSD bitches with known (n=16) and unknown (n=6) ovulation days. The accuracy of the above model was 77-100% for ICC and 83-96% for BPD with a precision of ±1 and ±2days, respectively. Accuracy increased significantly when US was performed more than 35days before parturition for ICC and more than 15days before parturition for BPD. BD and CRL were the most accurate parameters (R=0.95 and 0.85). In bitches with unknown ovulation day, BD accuracy was 71.4-100% with a precision of ±1day and ±2days, respectively. CRL and DPTV were less accurate (±1day, 60%; ±2days, 80% accuracy).
这项工作的目的是使用先前在一项初步研究中开发的线性回归模型，利用已知排卵日的德国牧羊犬母犬的羊膜腔（ICC）、双顶径（BPD）、头臀长（CRL）、体径（BD）和端脑泡深部（DPTV）来计算分娩前天数（DbP），然后在排卵日未知的母犬中测试该模型。在我们当前的研究中，先前报告中发表的一个针对德国牧羊犬母犬的模型，被证明适用于ICC [DbP = 44.76 - (4.34×ICC)] 和BPD [DbP = 38.65 - (12.86×BPD)]。因此，我们采用了他们的模型，但针对CRL、BD和DPTV开发了一个新模型。对于ICC和BPD，我们测试了分娩前超过35天（ICC）和分娩前超过15天（BPD）的准确性。在对22只已知（n = 16）和未知（n = 6）排卵日的德国牧羊犬母犬进行的每次超声记录（US）期间，对至少两个胎儿进行测量。上述模型对于ICC的准确性为77 - 100%，对于BPD为83 - 96%，精度分别为±1天和±2天。当在分娩前超过35天进行ICC超声检查以及在分娩前超过15天进行BPD超声检查时，准确性显著提高。BD和CRL是最准确的参数（R = 0.95和0.85）。在排卵日未知的母犬中，BD的准确性分别为71.4 - 100%，精度为±1天和±2天。CRL和DPTV的准确性较低（±1天，60%；±2天，80%的准确性）。
