الفهرس 
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Abstract
This study was carried out in a private dairy farm at Towa. EI-Minia Governorate. Egypt. under the supervision of Department of Animal production. Fac. of Agric .. Minia ~iversity during the period from 6-4-]989 to 8-7-1989. The objective of this study was to investigate the effpct of replacing crushed ear corn by eli fferent levels instei’lf1 of similar amounts of the main manuifactured concentrate mixture} on groHth performance and blood constituents of growing lllf\Je
T”,enty-one intact male Friesian calves aged abont 11 - 13 months and their initial body weight at the begining of experiment ranged from 303 - 308 kg.
The RnimaJs were randomly assigned into tllree groups of equal numbers (7 each). These three groups were fed on t’fltions containing 0,15 and 30?’6 crushed ear corn(C. E.C)J-espectiveJy.
The resul ts can be summar i zed as f ollm”s 1- Growth performance :
Increasing C.E.C. level in the diet increased signifi-
cantly (P < 0.01) the daily gain during the whole experimental period. TIle differance between means of diets containing eitJler 15?’6 or 30 ?’6 C.E.C. WflS not significant but both of them differed significantly (P < 0.05) than t.he control dipt thRt contflin zero C.E.C. level.
Calves fed on the diet containing 30% C.E.C showed I1Pttpr values of fed conversion (4.93 kg TDN/kg gAin) folJowr<1 by calves fed on the diet including 15 % C.E.C (5.31 kg TDN/kg gain) while those fed on the diet free from C.E.C showed the lowest value of feed util ization. (5.96 kg TDN gAin). The differences among gronps were signif:icnnt (P < 0.01).
The corressponding values of feed containing 2.14”
1.9.3 and 1.62 for calves fed on 30. 15 and zero ?’6 of C.E.C in their diets respectively. The differences were significant: (P(O.Ol) in favouring these fed on 30~6 C.E.C containing fliet.
2- Blood constituents :
Increasing C.E.C level in the diet increaced signifiicantly both total lipids and cholesterol COllcentrRtions and significantly decreased(? < 0.01) total proteins concentration in blood. Heamatocrate values ,.;ere not sign j [i cant ly a [fected by C.E.C inclusion level in the diet. It could be noticed tllaf as Rnimals advanced in Age all blood constjtnents thAt mentioned above were ine-reased. TlljS may jndicRte that flninmls are still in growing stage and the syntbetic process are going on in increasing oJ:’<Ier.
3- Feeding value and digestion coefficients:
Increasing C.E.C level i.n the diet inC1’0i’\Ced signifiicantly (P < O.OJ.) the feeding vallte of the rCltion expr0ssp!l ClS T.D N anel digestion coefficients (P < 0.05) of N.F.E on t-lw other llanO. digestion coefficients of crude Jlt’otf’ill Has significantly decreased (P < 0.05).