A comparison of dried poultry waste, cottonseed meal and urea as nitrogen supplements for sheep fed low quality roughage

摘要: Three growing lambs were used in a 3x3 Latin square to determine utilization of nitrogen (N) from diets con­ taining wheat straw supplemented with dried poultry waste (DRW), cottonseed meal (CSM) or urea. The supplements pro­ vided approximately 85^ the total dietary N and DRW, CSM urea supplied 80$, 80$ 60$ their respective supplements. Total dry matter intake averaged 6? g/W^g0 • Nitrogen was 25.5 g/day for all diets. Apparent digestibility sup­ plemented diet higher (R < .05) 74$, compared 68$ DRW 6?$ Daily urinary excretion highest on (16 g) followed by (14 (11 g), Approx­ imately 35$ absorbed retained 16$ (P ,05). Following completion square, Were fed only 70 days. ad libitum mat­ ter during this phase 52 g/W^ ° . negative balance throughout unsupplemented period, although degree nega­ tivity tended decrease each collection period. Es­ timates metabolic fecal ( 6 1 g/ 0 g