Composição nutricional e digestibilidade in vitro de genótipos de milho em dois anos agrícolas

• Ano de defesa: 2012
• Autor(a) principal: Tres, Tamara Tais
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual de Maringá; Brasil; Departamento de Zootecnia; Programa de Pós-Graduação em Zootecnia; UEM; Maringá, PR; Centro de Ciências Agrárias
• Palavras-chave em Português: Genótipos de milho; Frações de Carboidratos; Silagem; Híbrido; Valor nutricional; Brasil.; Corn genotypes; Fractions of carbohydrates; Silage; Hybrid; Nutritional value; Brazil.; Ciências Agrárias; Zootecnia
• Link de acesso: http://repositorio.uem.br:8080/jspui/handle/1/1704

The objective of this study was to evaluate the chemical-bromatological composition, quantitatively characterize, in a comparative way, the carbohydrate fractions of commercial corn hybrids and of materials from crossing between hybrids for silage production. Therefore, 14 multiple hybrids, 7 commercial hybrids, 7 self-fertilized from commercial hybrids progenies and 2 controls were evaluated in two agricultural years. The 2B710 hybrid showed high dry matter in vitro digestibility in the first year and fiber fraction in the two years of evaluation. The progeny P30P34 x P30P34 showed high dry matter digestibility and fiber fraction in two years. The highest fraction of non-fibrous carbohydrates (A+B1) was found for the crosses IMPACTO x CD308 and P30R50 x CD308 for the first and second year respectively, indicating a greater efficiency in providing readily available energy in the rumen. The significant interactions between corn hybrids and agricultural years for chemical-bromatological composition showed that the growing environment has great influence on the nutritional composition, leading to the necessity of evaluating multiple environments in order to select corn for silage production