Utilização da ultra-sonografia em ovinos e caprinos para sexar fetos e estimar idade e o peso fetal ao nascimento

Abstract

This work was divided in three chapters, had the objective to establish fetal measurement parameters that allow appreciate the age of gestation (IG) and birth fetal weight with one or two ultra-sonografic examinations with, to determine the ideal moment to sex goat and ovine embryos comparing the average migration period of the genital tubercle between sex, race and species, to evaluate the accuracy of the fetal sexing between sexes, as well as defining the best plans for sexing of goat and ovine embryos. In the first chapter experiment 156 Dorper, Morada Nova and Damara embryos had been monitored, from 30 to 45 days of gestation, being measured the céfalo-coccígeo length (CCC), area (AC), perimeter (PC) and volume (VC) of concept and area (AV), perimeter (PV) and volume (VV) of the embryonic vesicle. All you create them had been weighed after the birth immediately. The equations had not evidenced existence of relation (P > 0,05) between the photometric parameters and the fetal weight to the birth, however, they had shown to high correlation (P < 0,05) with the pregnancy age and amongst the parameters, the CCC were what it presented greater efficiency. In the experiment of as the chapter two 280 embryos in 24-hour intervals had been monitored, of the 30 to the 60 day of gestation in the sheep and of the 40 to the 60 day in goats, with ultrasound. The average time of migration of the TG in the ovine species (41, 3 ± 3,1 days) was lesser (P < 0.05) that in the goat species (47,2 ± 2,3 days) and in this species, the migration of the TG of the embryos of the race of Saanen was more delayed (P < 0.05) of that in the too much races. Ahead of the results concludes that the fetal sexing in the ovine is precocious of the one than in the goat ones and that the sex of the embryo does not influence in the average time of migration of the TG. In the experiment of the third chapter 280 embryos from 219 females were monitored , being examined goats between Days 40 and 60 and sheeps on Days 30 to 60 of pregnancy, with an ultrasound equipped with linear transducer (6.0 and 8.0 MHz), by transrectal via. Of the visualized plans, longitudinal the ventral was considered most efficient to sex foetus in both the species, a time that are acquired images of the initial period of genital tubercle migration, beyond the visualization of other structures, as umbilical lace, nipples, prepuce, mammary gland and escrotal bag.