الفهرس 
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Abstract
This Work Was Carried Out At Faculty Of Agriculture Damanhour University During The Period from July To September 2010.The Works Aim To Investigate The Effect Of Thermal Condition At Day 3 Of Age And Crude Protein Regimen On The Tolerance Of Two Broiler Strains To Heat Stress When Broilers Were Exposed During 220To 32 Days Of Age. Atotal Number Of 512 Day Old Male Broiler Chicks As 256 Each from Hubbard And Arbor Acres Strains Were Randomly Distributed In Factorial Experimental Design Among 16 Treatment Groups 4 Protein Regimen by 2 thermal Conditions Chicks Was Exposed To 37.3c And 70 % Rh For 24 h At day 3 And Returned To Normal Condition Thereafter Tc Group Or Unexposed By Two Strains Of Broilers . The cpr Were 24% cp With 3098 Me Kcal from Day 1 To 21 And 22% cp With 3213 Me Kcal/kg Dyring Day 22-24 of age.