Full text
| |
| Author(s): |
Victor José Correia Santos
Total Authors: 1
|
| Document type: | Doctoral Thesis |
| Press: | Jaboticabal. 2017-12-20. |
| Institution: | Universidade Estadual Paulista (Unesp). Faculdade de Ciências Agrárias e Veterinárias. Jaboticabal |
| Defense date: | 2017-11-09 |
| Advisor: | Wilter Ricardo Russiano Vicente |
| Abstract | |
The understanding about the physiology of the gestational process and embryonic/fetal development offers tools to make wise decisions regarding the management of the pregnant female, besides, these animals are used as experimental models, which reinforces the importance of the study of gestation in sheep. In this context, ultrasonography is the best option for the evaluation of gestation. It is safe and allows repeated evaluations to be made throughout the gestational process. The objective of this study was to assess the embryonic/fetal physiological development during pregnancy of sheep by means of ultrasonography in order to obtain normality parameters that can be used as a reference for the diagnosis of embryonic/fetal development alterations and to develop formulas for estimate gestational age. Thirty Santa Ines sheep weighing 45.4±4.3kg, between 2 and 5 years old were used. Ultrasound examinations were performed weekly from the 3rd to the 21st gestational week. For the statistical analysis Shapiro test was performed for normality with real or transformed measurements correlated with the gestational weeks by the Spearman test. When significant, parameter adjustments and gestational weeks were tested for regression models. A significance level of 5% was used and the results presented as mean ± SD (standard deviation). The gestational vesicle (GV), abdominal (AD), thoracic (TD), biparietal (BPD), ocular orbit (OO) and placentonium (PL) diameters were evaluated, as well as the crown-rump (CR), head-nose (HN), shoulder-blade (SB) umerus (UM), radius (RD), femur (FEM), tibia (TI), metatarsus (MTT), metacarpal (MCAR), heart rate (HR in beat/min) measurements obtained with Pulsed Doppler and measurements of the length of the base to the apex of the heart (LCOR) and width in the region closest to the base (WCOR). The highest coefficients of determination (R²) were obtained for the biparietal diameter was 96.5% and for the metacarpal 93%. The abdominal diameter had 91.7% and the heart width 90.2%. The latter can be used to estimate the gestational period from the 4th to the 21st week, allowing the Veterinarian to make inferences about the normality of the development of gestation. Ultrasonographic evaluations allowed the monitoring of gestational development in sheep, resulting in high correlation with the development of maternal-fetal structures, which can be used as reference values for gestational follow-up and detection of abnormalities in embryo/fetal development. (AU) | |
| FAPESP's process: | 14/15422-0 - Maternal fetal B-mode and Doppler sonography in gestational evaluation of sheep |
| Grantee: | Victor José Correia Santos |
| Support Opportunities: | Scholarships in Brazil - Doctorate |