O metodo dos sacos de nylon: seu interesse na avaliacao da qualidade de alimentos para ruminantes

Three studies been performed to evaluate the merit of the nylon bags method's in assessing the quality of feeds for ruminants. Concerning the study I, the main purpose was to test the method applied to different kinds of feeds (4 legumes straws and one cereal straw, leaves and legumes grains have been used); in study II, attempts have been made in order to test method's application to the comparison between similar kinds of substrata (7 legume straws have been used) and to validate the results in situ through the results in vivo; in study III, the method was used as a mean to estimate intake. The method allowed, in study I, to group the three kinds of feeds according to their degradability; in study II allowed to found significant differences (C"* = 2.599; P<_-0.05) between the degradation kinetics in most of the straws and to similar categorize both the potential degradability and from digestibilities values; in study III the interdependency established between the quantity of dry matter intake (DMI) and both the chemical composition and dry matter and neutral detergent fiber degradation parameters show that the latter at those which best explain the variation observed among the legumes straw's DMIAvailable from Fundacao para a Ciencia e a Tecnologia, Servico de Informacao e Documentacao, Av. D. Carlos I, 126, 1200 Lisboa / FCT - Fundação para o Ciência e a TecnologiaSIGLEPTPortuga