This research was conducted to evaluate the energy and the fiber digestibility of diets containing urea, starea and cottonseed meal as nitrogen sources and corn silage as forage. Twenty-four lambs averaging 11 months old and initial 31 kg LW and total feces collection method were used. Dry matter intake was 64.1, 68.8 and 71.4 g /kg PV.75 /day and the energy, NDF and CF digestibilities were 63.0, 67.7 and 64.4%, 39.6, 55.7 and 50.0%, 47.0, 49.3 and 53.4%, for the diets with urea, starea and cottonseed meal, respectively. The average weights gain were 278.5, 348.0 and 293.7 g/anim./day, in the same above sequence. The use of starea would be more adequate in relation to urea and cottonseed meal in diets with corn silage as forage for lambs.
apparent digestibility; cottonseed meal; energy; NDF; starea; urea
