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Nitrogen Utilization by Lambs Fed Wheat Straw Alone or with Supplements Containing Dried Poultry Waste, Cottonseed Meal or Area^{1 ,2,}

University of Arizona, Tuczon 85721

Abstract

Three growing ram lambs were used in a 3 x 3 latin square to determine utilization of nitrogen (N) from diets containing wheat straw supplemented with dried poultry waste (DPW) cottonseed meal (CSM) or urea. Supplements formulated from the three N sources provided 85% of the total dietary N. The DPW and CSM provided over 90% and urea over 70% of the N in their respective supplements. Daily intakes of total dry matter (67g/W^.75_kg), straw dry matter (46g/W^.75_kg) and N (25.7g) were not affected (P>.05) by source of supplemental N. Apparent digestibility of N was higher (P<.05) for the urea supplemented diet (74%) than for DPW (68%) or CSM (67%) diets. Daily urinary N excretion was highest (P<.05) on the urea diet (16g) followed by DPW (14g) and CSM (llg) diets. Approximately 35% of the absorbed N was retained on the CSM diet compared with 16% for DPW and urea diets (P<05).

Upon completion of the latin square, the lambs were fed only wheat straw for 70 days. Nitrogen balances were determined after 10, 28 and 63 days. Daily intakes of straw dry matter (52g/W^.75_kg) and N (4.7 g) were similar (P>.05) for all three collection periods. Although the lambs were in negative N balance throughout this unsupplemented phase, the degree of negativity decreased in each succeeding collection period.

¹ Arizona Agricultural Experimental Station Technical paper No. 2711

² Authors express appreciation to McAnally Enterprises, Inc. Yucaipai, CA for supplying the dried poultry waste used in this study.

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