الفهرس 
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Abstract
In Egypt , farm animale suffer from an extreme shortage of green foreges during summer. The dry roughages are of
limited quantities and are of considerably high prices .The present study was undertaken in order to investigate the feasbility of replacing clover hay be maize stalks enriched with urea or urea plus molasses to compensate for their high fiber and low N contents . Two main aspects were dealt with during this study :
A- Emphasis was directed towards studying the appropriate method of evaluating t he feeding value of the
tested roughages taking into consideration the possible associative effect when fed a long with concentrates . B- Effect of replacing clover Lay by the supplemented
maize stalks in the rations of lactating cows in terms
of milk yield and composition, efficiency of feed utilization and economical efficiency. A- Evaluating the feeding value of. the experimental rations and ingredients in metlism trails wit sheep :Seven metabolism trials were oonducted using two
replicate sheep .In the first four trials, the feeding valueof maize stalk supplemented with 2% urea (MS+U) , maize stalks plus 2% urea and 10% mol as3es (U+M ), clover hay (eh ) and concentrate feed mixture (CFM) were directly determined when offered ad lib. In the other three trials , each sheep was given 500 g CFM / day together with one of the three
tested roughages. The feeding values of the tested roughages were caloulated indireotly using CFM as a basal ration.
I n addition t he feeding value of the CFM was obtained considering each of the three roughages as basal ration.
The results obtained could be 6um. .. arized as follow : 1- The nutritive analysis Of the CR revealed that the
batch used was of medium. quality. The CFM was of similar” composition to tilat of’ the Governmental CFM I of similar proportions of ingredients . the composition of the MS was
within normal ranges recorded in Egypt. The analysis Of MS,+U
a:1d MS-U-M indioated suitable incorporation of the supplements t o the stalks.