الفهرس 
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Abstract
One hundred anti fifty or eight weeks—old commercial. L.S.i1. bteed which worn experimented on to study the eFfect of different feeding systems, with different protein )ovt,is dating tbe irowing period on the growth and the la4ug petor-1a ,13cv. br 2) Three dietary protein levels (18, 15 and 12%) were used in the first -period -#102;-#114;-#111;-#109; the growirt phase (8 —12 weeks) br 3)At theage of 18weeks calcium level of laying ration br (3.5%) was supplied for half of the subgroup IA,to show the effect of using laying ration two weeks prelaying. ). br 4.) In the first stage (8—12 weeks), the 18% protein it,v•; It. more th...n that naouod for this stqçe of growth and iLi ii. mean:.. additic,n of extra cost to the ration, while the 12% L’vei is too low for normal body weight development. So, tIi 15% level is pointed as the optimal one that satisfying the needs vs the birus. br 5) In His aecnnd stage (12—20 weeks), a highly signhfic:’:t ucrWLatioa etwc.n the dietary protein laveib and the grc’wtl; br of the pullelu, ha ie resulted, -#119;-#104;-#101;-#114;-#101; 12% or 13% levels oi prt.r’i