Histopathological aspects of the liver of free-living and farmed bullfrogs (Lithobates catesbeianus)

• Main Authors: José Teixeira de Seixas Filho, Claudio Barberini Camargo Filho, Marcelo Maia Pereira, Ana Maria Cristina Rebello Pinto da Fonseca Martins, Oswaldo Pinto Ribeiro Filho, Sílvia Conceição Reis Pereira Mello, Luara Lucena Cassiano, Marcio Hipolito
• Format: Article
• Language: English
• Published: Sociedade Brasileira de Zootecnia
• Series: Revista Brasileira de Zootecnia
• Subjects: amphibians; diet; nutritional disorder; pathology; protein
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000400275&lng=en&tlng=en

ABSTRACT The objective of this study was to compare the histopathological aspects of the liver of free-living and farmed bullfrogs (Lithobates catesbeianus). Thirty liver samples were collected from young and adult bullfrogs in the states of Minas Gerais and Rio de Janeiro, Brazil. Marked blood congestion and even hemorrhage and a large number of melanomacrophages were observed in most of the livers from free-living bullfrogs. Additionally, hepatocytes showed cytoplasmic eosinophilia and some showed nuclear hypertrophy and presence of microvesicular steatosis; small foci of infiltrates of mononuclear cells were observed in some samples, as well as a thicker capsule. In the farmed bullfrogs, cytoplasmic rarefaction was normal. Morphologically, unlike the livers of animals reared on farms, the livers of free-living animals did not show any evidence of protein-mineral deficiency, characterized by cytoplasmic vacuolation and a larger number of melanomacrophages, suggesting greater aggression to the liver parenchyma, probably due to environmental toxicity. Free-living bullfrogs feed on proteins of better biological value, derived from animals preyed in the natural environment.