Banca de DEFESA: ALANA LORENA GONÇALVES POMBO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ALANA LORENA GONÇALVES POMBO
DATE: 29/08/2022
TIME: 14:00
LOCAL: SALA VIRTUAL - PLATAFORMA GOOGLE MEET
TITLE:

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KEY WORDS:

Hystricomorphic rodent; skeletal system; fetal growth; cursorial.

PAGES: 70
BIG AREA: Ciências Agrárias
AREA: Medicina Veterinária
SUMMARY:

The agouti is one of the best-known rodents that inhabit rain forest, being found in southern Mexico, Central and South America. Studies about the embryological and fetal development of the species provide information that help us to understand the adaptive strategies of the newborns. Thus, we sought to describe the bone development during the gestational phase of the black agouti (Dasyprocta fuliginosa), comparing it with other precocial and altricial species, relating it to the adaptive strategies of the species. We analyzed a total of 33 embryos/fetus, obtained over 17 years in collaboration with local subsistence hunters residing in the Amazon. Measurements of the mineralized portions of the axial and appendicular skeletons were performed using ultrasonography, using a linear and multifrequency 10 -18MHz electronic transducer in B-Mode. Data were evaluated using linear and non-linear logistic regressions using the CurveExpert Professional 2.7 software, and logistic regressions to estimate the probability of occurrence of bone mineralization using the Statistica 8.0 software. The fetal age formula was strongly associated with the total dorsal length (TDL). The chronological order of occurrence of mineralization in relation to TDL was: axial skeleton (skull, vertebral bodies, ribs, TDL = 8.2 cm); clavicle, scapula, humerus, radius, ulna, ilium, ischium, femur, tibia and fibula (TDL = 8.2 cm); metacarpals, metatarsals bones and pubis (TDL = 9 cm); phalanges and calcaneus (TDL = 13.2 cm); carpus (TDL=15.10 cm) and distal row of tarsus (TDL = 19.6 cm).  Patella was not observed. The secondary ossification centers that presented first signs of mineralization were: distal epiphysis of the radius, distal epiphysis of the femur, and proximal and distal epiphysis of the tibia (TDL = 13.2 cm). Advanced fetuses (TDL≥ 21.5 cm, 93.5% gestational. It was observed that the neonates of the agouti have a well-developed skeleton, which allows their locomotion right after birth, giving them a certain independence in the postnatal period, which justifies their precociality. The results obtained can contribute to the monitoring of bone development in this species, and in other wild species, helping to understand the life history of these animals, and serving as parameters for comparisons between precocious and altricial mammals.

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Externo à Instituição - MOACIR FRANCO DE OLIVEIRA - UFERSA
Presidente - 1305300 - FREDERICO OZANAN BARROS MONTEIRO
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Externo à Instituição - PALOMA ROCHA ARAKAKI HENRIQUES