Effect of different sources of nitrogen on in situ degradability and feed intake of Zebu cattle fed sugarcane tops (Saccharum officinarum)

摘要: Abstract Research projects were conducted to determine the amount of nitrogen needed maximize dry matter intake (DMI) and degradability in steers consuming sugarcane tops (SCT). Four Zebu allocated four experiments under a 4×4 Latin square design fed SCT as basal forage. The sources Taiwan grass (TG) at 0, 100, 200 300 g/kg; poultry manure (PM) urea 8, 16, 24 g/kg DM high-nitrogen/energy supplement (HNES) 500, 1000 1500 g fresh matter/(animal day). addition increased total DMI all experiments, except experiment 1, where, TG had substitution effect on intake. PM was 100 g/kg DM treatments 2, regardless quantity offered. Organic (g/kg W 0.75 ) with supplementation (P 3 concentration range 90–110 mg/l PM, HNES. These trials confirmed that are potential source forage for cattle, but sole food deficient nitrogen. However, it is possible supply this by 100 g PM/kg DM, 8 g urea/kg DM or 500 g HNES satisfy needs rumen microorganisms fermentable diets.