One hundred and sixty Alpine kids (16kg BW) were studied for 150 days with two diets, evaluating in situ DM disappearance, VDMI, OMI, rumen degradation, rate of passage, ammonia (NH3) and volatile fatty acids (VFA) concentrations, apparent digestibility, pH, total fermentable carbohydrates (FC), and BW gains. Group 1, designated as CS/SIUS (n=80 plus two cannulated goats) was offered corn stubble (CS) 800g per day and alfalfa hay (AH) 100g per day, with 150g per day of a slow-intake urea supplement (SIUS) consisting of 16.5% molasses, 5% urea, 4% fishmeal, 2% limestone, 16% cottonseed meal, 17.5% rice polishing, 14.5% corn, 9.5% poultry litter, 4.1% commercial mineral salt, 0.9% orthophosphate, 2% ammonium sulfate, 1.5% cement kiln dust, and 6.5% animal lard. Group 2, designated as AH/BC (n=80 plus two cannulated goats) were fed 550g AH per day supplemented with 450g of a balanced concentrate (BC) per day, consisting of 1.1% mineral salt, 1.2% orthophosphate, 40.0% corn, 25.9% wheat bran, 25.8% barley, and 6.0% soybean meal. VDMI and OMI were similar for 150 days for the two experimental diets fed to goats. NH3 concentration and degradation of potential non-degradable DM fractions were augmented by SIUS (P