Ali A, Fahmy S
Department Theriogenology, Faculty of Veterinary Medicine, Assiut University, 71526 Assiut, Egypt.
Anim Reprod Sci. 2008 Jun;106(1-2):90-9. doi: 10.1016/j.anireprosci.2007.04.010. Epub 2007 Apr 20.
The aim of the current study was to establish ultrasonic biometric threshold of different fetal parts in buffaloes and to evaluate the feasibility and accuracy of ultrasonic fetal sex determination. Serial ultrasonographic examinations were carried out on twelve pregnant buffalo-cows, during which fetal parts were measured, and fetal sex and presentation were determined. The obtained results revealed that embryo and amniotic vesicle (AV) were detected by the forth and fifth week of pregnancy, respectively. Organization was observed by the seventh week, while ossification was indicated between the eighth and 10th week. High correlations were found between different studied parameters and gestational age, where the highest correlation was found with the crown-rump length (CRL) and amniotic vesicle diameter (AVD) at the early-gestation; the biparietal diameter (BPD) at the mid-gestation; and the eyeball diameter (EBD) at the mid- and late-gestation. The results also revealed that the best window for fetal sexing was found between the 10th and 18th week of gestations, with an overall accuracy of 97.1%. The final polarity with all fetuses in anterior presentation was adopted by the 30th week. In conclusion, the overall data indicated the feasibility and value of ultrasonographic fetometry in buffaloes for evaluation of fetal development, estimation of gestational age and determination of fetal sex.
本研究的目的是确定水牛不同胎儿部位的超声生物测量阈值，并评估超声测定胎儿性别的可行性和准确性。对12头怀孕的母水牛进行了系列超声检查，在此期间测量胎儿部位，并确定胎儿性别和胎位。所得结果显示，分别在妊娠第4周和第5周检测到胚胎和羊膜囊（AV）。在第7周观察到组织结构，而在第8周和第10周之间显示有骨化现象。在所研究的不同参数与胎龄之间发现高度相关性，其中在妊娠早期与顶臀长（CRL）和羊膜囊直径（AVD）相关性最高；在妊娠中期与双顶径（BPD）相关性最高；在妊娠中晚期与眼球直径（EBD）相关性最高。结果还显示，妊娠第10周和第18周之间是进行胎儿性别鉴定的最佳时期，总体准确率为97.1%。到第30周时，所有胎位朝前的胎儿均确定了最终胎位。总之，总体数据表明，超声测量法在水牛中对于评估胎儿发育、估计胎龄和确定胎儿性别具有可行性和价值。
