The gestation period in agoutis can range from 104 to 120 days. Knowledge regarding the morphological characteristics of embryos and fetuses is important as a base for studies in reproduction biotechnology, such as in vitro fertilization, embryo transfer and helps in determining congenital anomalies during the development phase. Thus, given the importance and lack of information about agouti embryology, the objective of this study was to characterize the external morphology and define the biometry of embryos and fetuses, at different days of development. Nine females were submitted to daily colpocytology to identify the estrus, confirm mating and identify day zero of the gestation. When the mating was confirmed they were weighed, underwent abdominal ultrasonography and surgery was conducted on the females at the gestational ages of 25, 30, 35, 40, 45, 50, 75 and 100 days. Sixteen embryos/fetuses were weighed and measured. Agouti embryos at 25 days after mating are "C" shaped, with primitive structures, 0.4±0.01cm crown-rump and weighed 0.06±0.01g; at 30 days after mating the crown-rump was 0.95±0.07cm and weighed 0.28±0.00g; at 35 days after mating the crown-rump was 155±0.07cm and weighed 0.38±0.01g; at 40 days after mating the crown-rump was 2.25±0.21cm and weighed 1.25±0.07g; at 45 days after mating the crown-rump was 3.45±0.35cm and weighed 2.75±0.64g; at 50 days after mating the crown-rump was 5.0±0.3cm and weighed 7.01±2.6g; at 75 days after mating, the skin was dark, the crown-rump was 10.0±0.14cm and weighed 55.2±0.07g. At 100 days after mating, the crown-rump was 13.8±0.49cm and fetuses weighed 136.7±9.40g. Based on the morphological data assessed the embryo and fetus age could be assessed and the size and average weight of agouti embryos was established.
Thirty adult agoutis (Dasyprocta primnolopha) from the Nucleus of Study and Preservation of Wild Animals at the Federal University of Piauí were used. Blood scrubs of these animals were colored by the Leishman method and analyzed in light microscopy. The cells had been measured using programs that analyze images (Leica QWin - Image Processing and Analysis Software). Mature erythrocytes, basophil reticulocytes, lymphocytes, eosinophils, neutrophils, monocytes, and thrombocytes were identified. Agoutis erythrocytes presented elliptical form, without nucleus with an average diameter of 5.64 micromeres ± 0.38. The lymphocytes are spherical cells with scarce cytoplasm, dense and with a very centralized rounded nucleus measuring an average diameter of 13.20 micromeres ± 0.35. The monocytes are slightly basophilic, with a spherical nucleus, central constriction, and an average diameter of 20.59 micromeres ± 0.32. The neutrophils are spherical, with a polymorphic lobulated nucleus, with an average diameter of 11.2 micromeres ± 0.20. The eosinophils are spherical with lobulated nucleus and with an average diameter of 14.25 micromeres ± 0.36. Only five basophils were observed, with abundance of cytoplasmic granules with 9.8 micrometers of diameter ± 0.30. Thrombocytopenic pleomorphism was frequent. There were similarities in the cellular constituents in peripheral blood of agoutis and of other rodents and humans. The cellular types from the peripheral blood, the morphology, and morphometry of the bloods cells did not vary according to sex.
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