الفهرس 
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Abstract
A total of 18 Newborn Friesian calves up to 8 mo of age were used in 3 dietary treatment groups. The 1st group was fed untreated CFM(C), the 2nd was fed CFM, 5 % of it was replaced by protected fat (PF) and 3rd was fed CFM treated with 1 % formaldehyde (PP) . Results indicated that average daily gain and protein and feed efficiency were higher (P<0.05) in PF and PP than C group. Values of ruminal pH increased (P<0.05) while VFA and NH3N in rumen liquor decreased (P<0.05) in PP than PF and C groups. Also, protozoal and bacterial counts in rumen liquor decreased (P<0.05) as affected by PF and PP. In whole blood, white and red blood cells increased in PF and PP than C group. Frequency distribution of lymphocytes increased (P<0.05) and monocytes decreased in PP than PF and C groups. While, granulocytes did not differ. Concentration of hemoglobin and PCV % increased (P<0.05) in PF and PP than C group. Concentration of total protein, albumin and globulin in blood serum increased (P<0.05) in PF and PP than C group. Glucose con concentration did not differ. Concentration of total lipid and cholesterol were higher (P<0.05) in PF than PP and C groups. Activity of transaminases did not differ. Calved fed PP showed the best carcass quality chemical analysis of meet did not differ. Also, calves fed PP showed the highest economic feed efficiency. ?The anatomical study revealed that fresh tissue weight of rumen. Contents weight and physiological volume of the reticulo rumen or their vales relative to total digestive tract, LBW or metabolic body weight were not affected by dietary treatment . Height and length of reticulorumen fold were higher (P<0.05) in PF and PP than C , while oesophageal groove was shorter (P<0.05) in PF than PP and C groups. Surface area of ruminal pillars was higher (P<0.05) in PF than PP and C groups. Dry weight of ruminal mucosa was lower (P<0.05) in PP than PF and C groups. The papillary measures, papillary surface area / cm 2 and total surface area of the ruminal mucosa was affected (P<0.05) by dietary, being lower (P<0.05) in PF than PP and C group.