Tiouréia no desenvolvimento de girinos de rã-touro e no desempenho de animais pós-metamórficos

• Ano de defesa: 2015
• Autor(a) principal: Takamura, Angela Emi [UNESP]
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Rã touro; Tiouréia; Tireoide; Crescimento; Compostos organicos; Thyroid gland
• Link de acesso: http://hdl.handle.net/11449/132858; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/10-12-2015/000855025.pdf

Thiourea (TU) is an organic compound often used for treatment of hyperthyroidism. This study aimed to evaluate the effects of thiourea on growth and development of bullfrogs on pre and post-metamorphic phases, by determining the deposition of body nutrients, performance and histological analysis of the thyroid gland, liver, kidneys, spleen and gonads. This work was divided into two phases. In the first phase, 7200 tadpoles were distributed in 12 boxes (500L) in a completely randomized design, and fed for 30 days with feed containing 0 (T0), 3 (T1), 5 (T2), 7 mg TU/kg of feed (T3), and three replicates. In the second phase, 696 juveniles originating from the first phase were housed in 12 pens of 3 m2. The body nutrients deposition obtained is in accordance with the normal growth of bullfrog tadpoles. The use 7 mg TU/kg of feed provided the best growth of the tadpoles. In treatment T0, we observed the normal development of the thyroid gland and in the other treatments there was hypertrophy of the thyroid gland due mainly hypertrophy and hyperplasia of follicular cells. In the second phase, we observed cellular changes in liver, kidney and spleen. In gonads we weren't observed any cellular or structural damage on gonads.The administration of 7 mg TU/kg in the bullfrog tadpoles feed resulted in larger animals on the growing phase and at the end of it. The use of thiourea during tadpole's phase in doses used in this study didn't cause toxicity or gonadal changes in adult animal