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| Mansano,Cleber Fernando Menegasso; De Stéfani,Marta Verardino; Pereira,Marcelo Maia; Macente,Beatrice Ingrid. |
| O objetivo deste trabalho foi determinar a deposição de nutrientes na carcaça de girinos de rã-touro (Lithobates catesbeianus) por meio de modelo não linear. Foram utilizados 2.700 girinos com peso médio inicial de 0,039 g. Ração comercial farelada com 55% de proteína bruta foi fornecida ad libitum. Os animais foram pesados e avaliados a cada dez dias para análise dos conteúdos de proteína bruta, extrato etéreo, água e sais minerais. Os parâmetros do modelo Gompertz foram estimados pelo método de Gauss-Newton modificado, e as taxas de deposição (g por dia) em função do tempo foram calculadas por meio da derivada da equação. Os valores encontrados para os parâmetros da equação de Gompertz, para descrever a deposição dos nutrientes na carcaça de girinos,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lithobates catesbeianus; Composição corporal; Modelo de Gompertz; Nutrição. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2013000800014 |
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| Mello,Sílvia Conceição Reis Pereira; Oliveira,Roberto Rodrigues de; Pereira,Marcelo Maia; Rodrigues,Eliane; Silva,Willian Nascimento; Seixas Filho,José Teixeira de. |
| ABSTRACT Despite the technological progress in frog farming, issues related to the environment, biosafety, and the use of technologies that minimise environmental impacts are frequently neglected by farmers. With the goal of developing a low-cost technology for reuse and preservation of water quality, an anaerobic filtering system combined with an aerobic filtering system was implemented in the grow-out sector in the Frog Culture Research Unit at Fundação Instituto de Pesca do Estado do Rio de Janeiro (FIPERJ). The filtering system received the effluent from six pens of frogs that were populated with 362 frogs in different development phases. The efficiency of the filtering system was evaluated by an analysis of the water before and after passing through... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Frog farming; Effluent treatment; Environmental preservation; Local development.. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542016000100067 |
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| Franzan,Bruna Caroline; Franco,Tatiana Werneck; Stefani,Giselle; Pereira,Marcelo Maia; Almeida,Fernando Queiroz de; Silva,Vinicius Pimentel. |
| ABSTRACT This study evaluated the influence of coastcross hay substrate hydration and equine fecal inoculum dilution on the parameters of fermentation and microbiology in in vitro essays. A 2 × 2 factorial block design was used. The first factor was hydration of the coastcross hay substrate 12 h before incubation or at the time of incubation, and the second factor was the dilution of fecal inoculum with a nutrient solution in a weight: weight ratio of 1:1 or 1:3. Degradation of the dry matter (DM), organic matter (OM), and neutral detergent fiber (NDF) were evaluated at 24, 48, and 72 h. Microorganisms were counted 24 h after inoculation. The ammoniacal nitrogen concentration (NH3-N), pH, and cumulative gas production were measured up to 72 h and adjusted... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Degradation rate; Gas production; Microbiology; Modeling; Roughage. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982018000100531 |
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| Seixas Filho,José Teixeira de; Camargo Filho,Claudio Barberini; Pereira,Marcelo Maia; Martins,Ana Maria Cristina Rebello Pinto da Fonseca; Ribeiro Filho,Oswaldo Pinto; Mello,Sílvia Conceição Reis Pereira; Cassiano,Luara Lucena; Hipolito,Marcio. |
| 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... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amphibians; Diet; Nutritional disorder; Pathology; Protein. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000400275 |
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| Janampa-Sarmiento,Peter Charrie; Takata,Rodrigo; Freitas,Thiago Mendes de; Freire,Licius de Sá; Pereira,Marcelo Menezes de Britto; Lugert,Vincent; Heluy,Guilherme Melgaço; Pereira,Marcelo Maia. |
| ABSTRACT We used five nonlinear models to calculate the weight gain of rainbow trout (122.11±15.6 g) during the final grow-out phase of 98 days under three different feed types (two commercials diets, A and B, and one experimental diet, C) in triplicate groups. We fitted the von Bertalanffy growth function with allometric and isometric scaling coefficient, Gompertz, Logistic, and Brody functions to weight (g) at age data of 900 fish, distributed in nine tanks. The equations were fitted to the data based on the least squares method using the Marquardt iterative algorithm. The accuracy of the fitted models was evaluated using a model performance metrics, combining mean squared residuals (MSR), mean absolute error (MAE), and Akaike’s Information Criterion... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aquaculture; Logistic model; Non-linear equations; Oncorhynchus mykiss. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982020000100200 |
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| Mansano,Cleber Fernando Menegasso; Stéfani,Marta Verardino De; Pereira,Marcelo Maia; Macente,Beatrice Ingrid. |
| Describing animal growth rate using non-linear models allows a detailed evaluation of growth behavior. Four non-linear models were used to fit weight gain and total length data of bullfrog (Lithobates catesbeianus) tadpoles, as follows: Gompertz, Y = A exp (-exp (-b (t-T))); Von Bertalanffy, Y = A (1 - K exp (-B t))³; Logistic, Y = A (1+ K exp (-B t))-1 and Brody, Y=A (1 - K exp (-B t)). We used 3,240 tadpoles, with average initial weight 0.044 g and average total length 12.79 mm, stage 25 Gosner. The measurements were conducted every ten days on 10% of the animals in every tank. The criteria used to select the model that best described the growth curve were: Residual Mean Square (RMS); determination coefficient (R²); residual graphical analysis; residual... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Frog farm; Growth curve; Lithobates catesbeianus. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542012000400010 |
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