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| Garbossa,Cesar Augusto Pospissil; Sousa,Raimundo Vicente de; Cantarelli,Vinícius de Souza; Pimenta,Maria Emília de Sousa Gomes; Zangeronimo,Márcio Gilberto; Silveira,Hebert; Kuribayashi,Thiago Hiroshi; Cerqueira,Luis Gustavo dos Santos. |
| This study evaluated the effect of ractopamine (RAC) on the performance of finishing pigs and the meat quality of these animals. Seventy crossbred pigs (35 barrows and 35 females) selected for high gain of lean meat, with initial weight of 77.1±0.32 kg were distributed in randomized blocks with five treatments (0, 5, 10, 15, and 20 ppm RAC in the diet) and seven replications during 28 days. The experimental unit was represented by a male and a female pig. Regarding the performance variables, there was a linear increase in final weight with increasing levels of RAC, as well as in average daily weight gain. An improvement in feed conversion was observed for animals fed RAC, and the optimal level - estimated by the LRP model - was ~ 5 ppm. For feed intake, no... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Β-adrenergic agonist; Lipid oxidation; Meat quality; TBARS. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000500004 |
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| Almeida,Vivian Vezzoni de; Nuñez,Amoracyr José Costa; Miyada,Valdomiro Shigueru. |
| The β-adrenergic agonist ractopamine is increasingly used in the swine industry due to higher consumer demand for leaner pork products. Redirecting nutrients to favor leanness rather than fat deposition, ractopamine improves growth and carcass traits of finishing pigs. However, the impact of this agonist on pork quality is not clearly defined. Understanding the biological effects of dietary ractopamine dose, treatment period, lysine levels, and the lysine to metabolizable energy ratio will help pork producers achieve improvements in animal performance, carcass leanness, and economic efficiency in swine production systems. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Β-adrenergic agonist; Carcass leanness; Growth; Nutrition; Swine. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132012000300016 |
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| Lopes,Edna; Sousa,Raimundo Vicente de; Zangeronimo,Márcio Gilberto; Pereira,Andressa Naira de Jesus; Coelho,Mariana de Resende; Ferreira,Matheus Soares da Silva; Lima,Renato Ribeiro; Marcondes,Fernanda Klein; Napimoga,Marcelo Henrique; Pereira,Luciano José. |
| This study aimed at evaluating the effect of ractopamine (RAC) on metabolism, zootechnical performance, body composition, and behavior in Wistar rats submitted to acute and chronic restrain stress. The oral dose of 5 mg/kg of RAC was administered in periods of 0, 7, 14, 21, and 28 days. The elevated plus-maze test (EPMT) was used for behavioral assessment. Blood, carcass and viscera characteristics were evaluated. Insulin-dependent glucose transporters (GLUT-4) were semi-quantified by Western Blot in epididymal adipocytes. RAC periods associated with chronic stress increased the GLUT-4 protein expression in adipose tissue in a time-dependent manner (P=0.01), i.e., the longer the RAC addition period, the higher the GLUT-4 concentration in chronically... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Β-adrenergic agonist; Ractopamine; Zootechnical performance; Metabolism; Elevated Plus-Maze Tests. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132015000300406 |
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| Ferreira,Matheus Soares da Silva; Garbossa,Cesar Augusto Pospissil; Oberlender,Guilherme; Pereira,Luciano José; Zangeronimo,Márcio Gilberto; Sousa,Raimundo Vicente de; Cantarelli,Vinícius de Souza. |
| The aim of this article was to evaluate the in vivo mechanism of action through which ractopamine reduces the amount of adipose tissue in carcass of animals fed diets supplemented with this drug. Literature search was carried out, using the keywords Ractopamine, lipogenesis, lipolysis, fatty acid and adipose tissue. The scoring system was designed for the adequacy of the methodology. A total of eight papers were found - all published in the English language. The determination of lipolysis and lipogenesis was carried out using different methods - from the quantification of non-esterified fatty acids in the blood to molecular analyses of adipose tissue. The review analysis suggested that, at least in the pigs, the use of this drug reduced lipid deposition in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Β-adrenergic agonist; Lipogenesis; Lipolysis. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132013000100005 |
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