الفهرس 
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Abstract
1-Dried poultry waste (DPW)end cottonseed meal mixture (meal:hulls=5:4)
2-Digestion coefficients determined indirectly by using bean steaw +yellow corn (4:1).
3-nitrogen retention for both materials was determined along with the basal diet.
4-four concentrate mixtures were formulated represinting 0.15.30 and 45%DPW replacing the CSM mix.the first one was typical to the chassical formula produced by the nile Ginning company at mining company at minia.these mixtures were fed with bean straw with a roughage /concentrate ratio of 1:3.
6-the feeding value of the four roughage
7-no statically significant difference was found between treatments for the percent Nretention of intake or absorbed.with high N intake , percent N retention of intake was lower than with low N intake..