Ultrasonographic mensuration of head dimentions in boxers normal gestations and its correlation with the gestationalage

Abstract

Dog's head dimentions show consistent variability for their dimentions, such as length, width (biparietal diameter) and height, according to anatomical classification in: braquicephalic, mesaticephalic and dolicocephalic. Since there are attempts to standardize values that characterize canine pregnancy, those architectonic features must be considered. The aim of this study is to use ultrasonography scanning examinations to correlate the fetal's head dimentions and gestational age in order to contribute to the intra uterine development comparative study of the dog' head. Serial ultrasonographic examinations were performed in 10 pregnant Boxers biches, 2 or 3 times per week from 18º day of gestation until the whelping, the used device was a portable GE®, Logic 100 MP, equipped with a sectorial transducer 5,0 MHz and another linear one of 7,5 MHz. Biparietal diameter (DBP), length (CC) and width (HC) of the fetal head had been measured since the opportunity that was possible to distinguish fetal head from fetal body, until the end of gestation. Such informations had been located in graphics of dispertion of the mensuration in function of the number of days before parturition. It was concluded that the mensurations of selected parameters were consistent among studied gestations and hightly correlated among them and with the parturition day. The parameter DBP was the most technically easier to be gauged.