Níveis de proteinas em dietas comerciais de leitoas em crescimento e terminação

• Autor(a) principal: Gandra, Érika Rosendo de Sena [UNESP]
• Data de Publicação: 2011
• Outros Autores: Berto, Dirlei Antônio [UNESP], Schammass, Eliana Aparecida, Gandra, Jefferson Rodrigues, Trindade Neto, Messias Alves da
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://revistas.ufba.br/index.php/rbspa/article/view/2034; http://hdl.handle.net/11449/141116
• topic: Carcass; Segregate breading; Protein level; Swine; Carcaça; Criação segregada; Nível de proteína; Suíno

The effects of crude protein levels in commercial diets were evaluated on growing and finishing gilts performance. There were forty-eight commercial gilts with 30kg (growing phase) and 60kg (finishing phase) average live weights from free disease farm. The experimental design was a randomized blocks with six replications and two animals per experimental unit. The protein levels were 19.5, 18.0, 16.5, and 15.0% in growing and 18.0, 16.5, 15.0 and 13.5% in finishing phases. During growing phase it was observed a quadratic effect of protein levels on final weight, weight gain, phase length and the optimal estimate level was 17% crude protein. The economic evaluation indicated the diet with 18% crude protein for growing phase. The quadratic responses to protein level at finishing phase indicate practically the same protein levels (15.2 to 15.3% crude protein) at age with 95kg, final weight and carcass yield percentage. The greater economic gain occurred with gilts receiving 15.0% crude protein level from 60 to 95kg. Segregate gilts from commercial production system presented better performance when received diets with 17% crude protein from 30 to 60kg and 15% crude protein from 60 to 95kg.