Grão de soja moído e níveis de amido na terminação de tourinhos Nelore confinados

• Ano de defesa: 2015
• Autor(a) principal: Rossi, Luis Gustavo [UNESP]
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Carne - Qualidade; Metano; Bovino de corte - Nutrição; Desempenho; Amido; Meat Quality
• Link de acesso: http://hdl.handle.net/11449/136795; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/22-03-2016/000860167.pdf

The aim of this study was to evaluate the effect of inclusion of ground soybean with high or low level of starch in the intake, digestibility, performance, enteric methane emissions and meat quality from young bulls Nellore finished in feedlot (n = 28, initial weight = 395 + 32 kg, age = 20 + 3 months). The diets consisted of starch level, high starch (AA) or low starch (BA), with soybean (CGS) or without soybean (SGS). The roughage used was corn silage and forage: concentrate ratio in the experimental diets was 40:60. The animals were distributed in a completely randomized design in a 2x2 factorial (AA or BA; CGS or SGS), totaling four treatments with seven replicates. Data were analyzed and subjected to analysis of variance with comparison of means by Tukey test at 5% probability. After 140 days of feeding the animals were slaughtered in commercial abattoir averaging 590 ± 34 kg. Animals receiving CGS had a mean reduction of 11% of intake of dry matter, organic matter, crude protein and total digestible nutrients (P<0.05). There was a significant interaction between starch and soybean on fiber intake neutral detergent (P=0.0191), with the lowest intake for animals that received AA CGS. The addition of CGS decrease by 3% the apparent digestibility of dry matter (P=0.0282) and 2.8% of organic matter (P=0.0348). There was a significant interaction between starch and soybean on the apparent digestibility of ether extract (P=0.0245) and neutral detergent fiber (P=0.0497), with the decrease ether extract digestibility (75.05%) and neutral detergent fiber (43.19%) in AA CGS. Animals receiving CGS had an increase in feed efficiency by 17% (P=0.0076). There were no significant (P>0.05) treatments in average daily gain (average 1.38 kg), carcass yield (58.42%), gain in carcass (1.04 kg / day), area rib eye (85.60 cm2) and fat thickness (6.46 mm). Animals receiving CGS had 28% reduction of the emission of enteric methane g.dia-1 (P<0.0001). There ...