Post-implantation development of red-rumped agouti (Dasyprocta leporina Linnaeus, 1758)

Animal Reproduction Science
Gleidson Benevides de OliveiraMoacir Franco de Oliveira

Abstract

Fourteen pregnant agouti (Dasyprocta leporina Linnaeus, 1758) females at gestational ages of 30-100days and two at gestational ages of 55-100days, were studied, including 24 embryos/fetuses and two neonates (single offspring from two females). Females were euthanized and embryos/fetuses were examined, measured, and photographed. Embryos at 30days post-copulation were "C-shaped," with paddle-shaped limb buds and 10.75±0.11mm crown-rump length (CRL). In embryos at 35days post-copulation, paddle-shaped forelimbs, fin-shaped pelvic limbs, and a liver bud were evident, with 15.6±0.16mm CRL; at 45days, mouth and nostrils were evident, lower incisors were emerging, and tactile hairs could be seen near the nostrils, with 40.8±0.4mm CRL; at 55days, cranial sutures had fused, digits were totally separated and claws formation was beginning, with 58.8±0.1mm CRL; at 65days, the genital bud had differentiated, with 83±0.08mm CRL; at 85days, the body was covered with short hair, with 127.7±0.6mm CRL; and at 100days, the mature fetus had fully formed teeth and claws and an open external acoustic meatus, with 164.3±10.4mm CRL. Neonates had bristly hair and open eyes, with 179.1±0.5mm CRL. In conclusion, characteristics of the embryo/fetus durin...Continue Reading

Citations

Sep 12, 2019·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Hélio N Araújo JúniorMoacir F Oliveira
Jun 10, 2021·Brazilian Journal of Biology = Revista Brasleira De Biologia·K R JonesG W Garcia

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