Alterações bromatológicas nas silagens de milho submetidas a crescentes tempos de exposição ao ar após "desensilagem"

Abstract

The experiment in a completely randomized design aimed at testing the effect of air exposure of maize silages at "feed-out" on chemical composition. Silages were prepared on May 18th, 2004 from a late season harvest of a crop at the half milky half dough kernel stage and chopped materials were packed in 30 liters mini-silos. Four treatments with four replicates consisted of air exposure of silages removed from the mini-silos after periods of zero, 12 hours, 24 hours or 36 hours until sampling for chemical analysis. Air exposure affected significantly (P<0.05) neutral detergent fiber values (corrected for ashes and protein) and lignin contents, without effects on non-structural carbohydrates and nitrogenous fractions. It is concluded that a 12 hour air exposure period after "feed-out" can affect the nutritive value of maize silage.