الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Low quality roughageespecially the crop residues form
an im:9ortant source of energy for r1111inan·t;s in many developing
countries where crop production has priority over feedstuff
production • These residues pose a disQosal problem, The
recent trends of exploiting the energy value of the crop
residues and enrici:J.ing tuair ni”Grogen content, received
much of consideration.
Urea is considered the cheapest sources of nitrogen
whicb. could be used to compensate for part of the limited
sources of available na·<;ural protein in .c.gypt • Available
technical rt>ports estic:ates tr1e a.Iaount of low quality roughages
in Egypt by about eleven million tons annually. Such
reports revealed that a promising advantage exist for these
roughages to covel’ t;i::co ::;twrtage of ani;;zal feed resources in
.b;gypt. The enrichment witn urea is expected to increase feed
intake from poor quality roughae;es. Howc.ver, the energy sources
in rations containing urea should be considered in order to
improve the effi~ency of utilization •
It is alcost; -t;rue ti:la”G tt1~ nature of the fibrous constituen-
t; could affect to a large extent the efficiency and
tne extent of response to urea enrichment.Therefore, rice
straw one of the most available roughages was subjected to
treatllient with urea solution an~ suppleillented with different
energy sources. The aim being test and find outthe possible
effects of these factors on feed intake with its
effect on the efficiency a~d utiliLation.