Determination of the proteins and carbohydrates fractions and estimative of the energy value of forages and by-products in Brazilian Northeast

• Autor(a) principal: Pereira, Elzânia Sales
• Data de Publicação: 2010
• Outros Autores: Pimentel, Patrícia Guimarães, Duarte, Labib Santos, Mizubuti, Ivone Yurika, Araújo, Gherman Garcia Leal de, Carneiro, Maria Socorro de Souza, Lousada Regadas Filho, José Gilson, Maia, Iana Sérvulo Gomes
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Semina. Ciências Agrárias (Online)
• Texto Completo: https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/3254
• topic: Energy; Protein; Semi-arid; Total Digestible Nutrients; Energia; Nutrientes Digestíveis Totais; Proteína; Semi-árido

The present study aimed to characterize the carbohydrates and proteins fractions and to estimate the energetic value of native and adapted forages and agro industry by-products produced in Brazilian Northeast. To obtain the carbohydrates fractions, according with CNCPS system, were calculated the total carbohydrates, its fractions B2, C and the soluble neutral detergent components. For the determination of nitrogenous fractions, were analyzed the non-protein nitrogenous compounds, soluble and insoluble nitrogen in borate-phosphate buffer, protein nitrogen insoluble in neutral detergent and acid detergent. To the estimative of TDN, were used the equations proposed by NRC (2001). The by-products analyzed carbohydrates fractions varied from 19.35 to 58.52%; 9.95 to 61.44% and 15.35 to 70.06, for A+B1, B2 and C, respectively. In the forages, the fractions A, B1, B2, B3 and C of nitrogenous compounds presented variation from 9.84 to 42.33%; 1.58 to 11.47%; 48.63 to 80.10%; 0.70 to 6.13% and 0.43 to 2.86%, respectively. The estimated TDN of the forages varied from 48.30 to 65.42%, while for the by-products varied from 31.41 to 128.9%. The fractionation of nitrogen compounds and carbohydrates are simple methodologies and should be common practices in laboratories of feed evaluation.