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2 ... J. %-#! +# 3 3!) 21- #H" J; 3E) F" )##( 3:;,&4 :N,1#$ %$7 24,."/ " +I 3) %-#! 3+# 3)#*4+ %N! J#H % 4 Vk"0 O= JN5 )%-&c 85& 4! (NRC, 1994),6 Xh#hs ]M )#`, "7 )##(.",,"* 3%I"I,&")#I 3+# 4 \& ) +h O,."/ " ]#i)d +h = ]N =#0m ]&.+&, )##( c# %-#!.(NRC, 1994) Ajinomoto Evonic ) ) " %>)* +& 3).,&")#I +-6) "" "-#I!,7W$ 38&D "* \#"&,."/ " %-#! 3+# +h (Heartland, 2010 (Industries, 2010 ]#i)d Rq ) =#0 Xk0 L ) J. X"Y % 3).,&")#I +", %. +). Cc* /.(Tahir and Pesti, 2012) " )#Gl 3:;,&4 ",.+ X0HP %. "I "#$,&")#I %-#! +# 3"8H C )G %&h "`- % &K 4! ]& OJ#H ]# 21- % ( ) 3E) F",&")#I O,! 3%I"I ),."/ " J. %-#! 3+# 3!) 3:;,4 ) (\#"& "" "-#I!.+ M,"* &>,5& 4! 3# )G,) "`- % & 4! ]& ( 2 \#"& ) #H" J; 3E) F" J 1 O,! ) %-#! +# 21- % ,"* 3%I"I,&")#I ( "" "-#I! O308 L %&" 4 \&,"* %I"I %0P; J&".> & 4! X"Y %,>: vw. Q)$ RH; )N % O& 4! # 4 \& ) %.+ (S-I T"6U ),"* %I"I %0P; 10 4 JN5.=>& w:/ Xx / ]#i)d +h O,&'^ 3)#I %#e 4 J1; AOAC (2005) C % 85& 4! &" %HM-. 3) &" %HM-. Xx %-#! +# )&h.+ ]##0 " %. " X"Y ]& % %-#! +# 8&D % %$"),)-& 8&D 4 "" "-#I! %-#! +# 3 1. NRC 2. Evonik Industries 3. Ajinomoto Heartland ) 4,"* 3%I"I C)D 3:;,&!. &c> 4 %&'( ]#::U b)$ 4 *+-C)D b)$ "1e =ei ". = "/),&k =# &c> +#H" 3%-&c. %Hc- %,4 ]&.(Lemme et al., 2004), % 3!" 3%I"I C)D %-&c,6y U %N-& % %I" 4 O(Dozier et al., 2007) = a"/ % T"),"* %,&'^ 3)#I +& "#$ %&'( ]#::U O ]& 4# " 3'( " ]# l ]m % #`- 3%"* 4 O(%-#! +#) ]#i)d 3E) J#1; 4 "#$ O"H+-&,&4)# ) + % &c> c# 3:; )#I ]#i)d 3E) o"6p np ]##0.(1394 J&+1 R&)m +-,e " % +& O%-&c 4 )#^ )*"6#. ) 4 JYq +! +4 p) =#; O,&'^ +! O+#H" %-&c. " %I" 4 &c> +& &c> 3!" c# O! 21 % +--.+#H".(1392 ON, 4) Oa"/ %-&c ) )#I 3E) np %. 3)#Gl % %I","* 3%I"I,&4+! %M# + =7) 4 ]##0 3+7 h! 3) ", O + J&;,"* 3%I"I C)D =0-Y 3:; )#I ). #`-.(1380 ON,-&+H )#er),."/ " #H" J; 3E) F" ]>)* )` X4 3-1 ) + n#s: 3)r #H" J; 3E)) ) + n#s:,h#hq #H" J; 3E) 3E) 4,6U Q"P +", ( ) ( ) X #H" 3?D %. + ); +)D #/ Rezaei, ) = +"/,D, \#H" 3E) XI#q 3)u#; "$ % %t)*.(2006,/) "I R1 % O+, 5 "#$ + %>)&'D O ) 3=&+s Zarei et al., Wolynetz and Sibbald, 1984) = 3E) XI#q %N! J#H % )8& b)$ + Cc*!) 4.(2014; L ),"* 3%I"I,&")#I 3) 3E) F" ]& 4 Vk"0 O=.(NRC, 1994) ",

3 25 (23-33) 1397 / /, X+#H" Xh#hs +#H" %-&c z" = a"/ %-&c / J. 4 (7 ="*,-0& O #0 4 )#^ O).'H{"> 3:; 3#0 +q L ) " u6p #0 \& %. dh/ " 4 \& ).+-,1 #0 )& O", #,H"D 3:; =#0m J#6s %,Y/ =ei 4 #0 ]& )8&+N& +--.J#N O]&)- +4)D, 3!".+- X"Y %,>: VW. Q)$ RH; & 4! 3 (2008) 3! c>) \. % 2 3 J&".> & 4! 4 ]#8# %&h 3).++ J#6s %&cm SAS +.+ +Y g-d 3! np LSD " 4! = μ :" )&4 Q) % Q)$ 3! Y ijk = μ + E i + P j + (EP) ij + e ijk O3)#*4+ " )#( 4 +5 ) +h 2) #H" J; 3E) F" )G 2 3) %-#! +# 3!) 21- F" )G = E i 21-3E) F" ".> ]# Jh )G =.& 4! 3P/ = e ijk = = Y ijk OJ. ]#8# P j (EP) ij (i=1 O(j=1 O%-#! +# a"/ ) %-#! +# 3"8H 3E) # F" )#G 3%I"I,&'^ J&+1 R&)m + )#I #`-.= + Cc* "1e R1 4 4 O,>): +I,"* L ),&'^,"* 3 %I"I + 4 ]#8# a"/ b):,&")#i %-#! +# 3"8H F".(P<0/05) + + 4,>): a"/ ]#8# ) 3,-0 )#Gl 3"8H 4.(P>0/05) =+,"* 3%I"I "" "-#I! \#"&,!,) %-#! +#.(P<0/05) +,&'^ J&+1 R&)m "1e R1 3"8H 4 %. 5,&D +#H" d/ % "" "-#I! \#"&,! %-#! +# %. = + Cc*.(P<0/05) " )e 3,-0 "$ L ),"* 3%I"I,&")#I ", + 4,>): a"/ &c> R1 hhs 4 )8&,/) %t)*.(1390on )"h0&) 3%I"I + 4,>): a"/ %. +" # % L ) + #`- 3)#I + %&'( W; \#"& O(Ajinomoto Heartland, 2010) Evonic Industries, ) )e %$") =.) %,."/ (NRC, 1994) %$") +I 4,! (2010 %HM-. Xx %&D ),&'^ 3)#I,.+!) (Ross Broiler, 2014) 308 L %&" XI#q &",&## R#.) +-J#N5 3cI %. ++ %#e 11-24) + O(,*4 1-10) ]&4^! Jq) e! 1 +I R#) % (,* ),&D (,* X+ 3) %I"I.= + Cc* 2 4! X"Y % a"/ o! %. +->& C)D ),"* 3%I"I ]&4".= ); e! #/ O]&4^! 3 4 \& ) 3e + a"k/ 4,>): a"/ %-&c.+ M,&D + (3 +I),>): a"/ )*"6#. ) =#; o)y6yq %1s 1 %P 4,>): a"/ +h.(nudiens, 2000) + a"/ )*"6#. ) =#;,>): a"/ +h (1,>): a"/ %-&c=,>): " e OJ. +! 4 dh/ " e OdH/ " OdH/ ",4 #0 O)#( 3%-&c 4 dh/ % ="* +#H" %-&c z" %& ),4 #0 %1s 7 6 O 5 O4 O3 O2 z 4 R#).(Kay et al., 2007) ++ " e OJ. +! 4 dh/ " e OdH/ " OdH/ ",4 #0 O)#( 3%-&c 4 dh/ % ="* +#H" %-&c z" %& ),4 #0 %1s 7 6 O 5 O4 O3 O2 z 4 R#).(Kay et al., 2007) ++ = % +! F"M - )#( 3%-&c F"M (2 dh/ "= +! 4 dh/ " e = dh/ " / +! F"M (3 J. +! " e = dh/ " / )#( 3%-&c F"M (4 )#( 3%-&c 4 dh/ ",4 #0 = dh/ " / %-&c F"M (5 dh/,4 #0 = +! F"M / %-&c F"M (6 %& )

4 ... J. %-#! +# 3 3!) 21- #H" J; 3E) F" )##( 3:;,&4 :N,1#$ %$7 26 -, %. +" =1 3)# ]^ +Y 3 3%I"I )5# 4 )5#,>): a"/ J#H +".+,"* Yari et ) = )5# 3,-0 "$ \&E)c& % %I".(al., 2105; Yaghobfar, 2016 L ) + #`- 3)#I O)#I ",&## R#.) (+Y Rq )) (,* ) + (,*4 1-10) ]&4^! 3,5& 4! 3)#I -1 +I e! Table 1. Experimental diets of starter (1-10 d) and grower (11-24 d) periods (% basis) and their chemical composition Starter diet (1-10 d) Grower diet (11-24 d) Ingredients NRC Evo Ajino NRC Evo Ajino NRC Evo Ajino NRC Evo Ajino Corn CP= Soybean meal CP=47.07 Soybean oil Calcium carbonate Dicalcium phosphate Salt Vitamin permix Mineral permix Coccidio acetat L- Lysine hydrochloride DL- Methionine L- Threonine Chemical composition of diets ME (kcal/kg) Crude protein Ca Available phosphors Na Total Lysine Total Methionine Met. + Cys Total Threonine Vitamin premix provided the following per kilogram of diet: IU Vitamin A, IU Vitamin D3, 9000 IU Vitamin E, 1000 mg Vitamin k3, 900 mg Vitamin B1, 500 mg Vitamin B9, 100 mg Biotin, 3300 mg B2, 5000 mg B3, mg B5, 1500 mg B6, 7.5 mg B12, mg Choline chloride. 2 Mineral premix provided the following per kilogram of diet: Mn mg, Fe mg, Zn mg, Cu 5000 mg, I 500 mg, Se 100 mg.

5 27 (23-33) 1397 / /, X+#H" Xh#hs e!,&## R#.) (+Y Rq )) (,* ),&D,5& 4! 3)#I -2 +I Table 2. Experimental diets of finisher (25-42 d) period (% basis) and their chemical composition Ingredients NRC Evo Ajino NRC Evo Ajino Corn CP= Soybean meal CP= Soybean oil Calcium carbonate Dicalcium phosphate Salt Vitamin permix Mineral permix Coccidio acetat L- Lysine hydrochloride DL-Methionine L- Threonine Chemical composition of diets ME (kcal/kg) Crude protein Ca Available phosphors Na Total Lysine Total Methionine Met. + Cys Total Threonine Vitamin premix provided the following per kilogram of diet: IU Vitamin A, IU Vitamin D3, 9000 IU Vitamin E, 1000 mg Vitamin k3, 900 mg Vitamin B1, 500 mg Vitamin B9, 100 mg Biotin, 3300 mg B2, 5000 mg B3, mg B5, 1500 mg B6, 7.5 mg B12, mg Choline chloride. 2 Mineral premix provided the following per kilogram of diet: Mn mg, Fe mg, Zn mg, Cu 5000 mg, I 500 mg, Se 100 mg. ( ") (,&D + O]&4^!),5& 4! )#I )*"6#. ) =#; -3 +I Table 3. Price for one kg of experiment diet (starter, grower and finisher) (Toman) Treatment Starter diet Grower diet Finisher diet NRC Evonik Ajinomoto NRC Evonik Ajinomoto %-#! +# 3"8H L ),&'^ )#I #`-,-0 &c> R1 )8& 3"8H "" "-#I! O,*4 42.(P<0/05) +,>): a"/ %-&c -,-0 "$ % -%I"I 3!" ]&)5# L ) + #`-,&'^ )#I 3 O,* (P<0/05) =,"* 3 ) %.,"* 3%I"I 3!" 3)#85t X +" + %&'( X %-#! +# 3"8H L 5,*4 42 3!",) O=+ "I,! %-#! +# 3"8H 4 %.." )e )#85t "$ % "" "-#I! \#"& -)#I %-#! +# 3"8H 3E) # F" )#Gl 3!",>): a"/ %-&c O+! ),&" 24.= + Cc* 5 +I,"* 3%I"I L ) + #`-,&'^ )#I O,*4 42 3%I"I +!,-0 &c> R1 +! ) 3,-0 X.(P<0/05) +,"* %-#! +# 3"8H L ) %.,"* 3%I"I O10.=+ "I +" + %&'( X "$ % a"/ %-&c &c> R1 L ),&'^ 3)#I #`- O,*4 3,-0 O,*4 24.(P<0/05) +,"* 3%I"I,>):

6 ... J. %-#! +# 3 3!) 21- #H" J; 3E) F" )##( 3:;,&4 :N,1#$ %$7 28 &c> R1 )#I 3E) np &c> + Cc*,>): a"/ %-&c &c> ]#-f )#I =#; )*"6#. ) 34 %,>): a"/ %-&c ) O", ON 3)#5) +,-0 )G 4 &c> 3E) np &c>.(1392 ON, 4 }1388 %-&c.,>): a"/ %-&c &c> R1 )#I )5#.(1385 ON ) ", ="* +#H" ),-1 3)#I,&4+! " %&'( 3%I"I )5# 4 J#H % +", O N& % %I" O+ ),-1 )#I + 3)5# +! =&e O%I"I C)> =#; " =s,>): a"/ %-&c %N-& % %I".+ M& a"/ )*"6#. ) =#; a"/ b): +h )#Gl &c> X4" % =#; )* 3)#I 4 = &c> c#,>): a"/ %-&c Oa"/ b): ON 3) }1395 ON ) +, J#H % ),-1 3)#I ]&)-.(1392 a"/ )*"6#. ) " ))* )5# a"/ b): 3)5#,>): a"/ %-&c 3.+" ) %-#! +# 3"8H 3E) Jh )G O]&4^! ]&)5# %. 3"$ % O",-0,>): a"/ %-&c ) + #`-.(P<0/05) (1 )#I % T"),>): a"/ %-&c JN) " "" "-#I! L +-t) %. +, 5 g& ]& F"M O]&)- )5# + -, M& L ) + #`-,&'^ )#I 3)k,&4+! %M# )5# V1 &c> J#H % OJh,H O+-. % 3:; dh/ )G & J. +-&!) Oa"/ 3%-&c L ),&'^.+-., 4) ). 3!" X"Y )#I #`- Ou#hs ]& " e,-0 &c> R1 g& u1$ 4 )#( 3%-&c 4 " e O+! 4 dh/ ="* +#H" %-&c. R1 ]#-f dh/ " X17 %.(5 +I) (P<0/05) +,"* 3%I"I,&'^ )#I,&"I%>)Y %. +, 5 g& ]& O)8& ^,67 %. = '*)#G 34+ % L ) ) 34 % O ). =1 %,&4+! dh/ " O+ M&,#67 %-&c & +! & e,).'*,,; +--.+#H" 3) 3)5# )#( 3%-&c 4 " e O+! 4 dh/ " +# 3"8H 4 5 dh/ " 4 "$ % "" "-#I! \#"&,! %-#! %-#! +# 3"8H 3E) # F"." )e 3,-0.(6 +I) =+,-0 )G %& ),4 ),"* 3%I"I,&'^ J&+1 R&)m + 4 O,>): a"/ ),5& 4! 3# )G -4 +I Table 4. Effect of experiment treatments on feed intake, body weight and feed conversion ratio of broiler chickens Feed intake (g/bird) Body weight (g/bird) Feed conversion ratio European production index Metabolizable Energy a a b b Amino Acid NRC b a Evonik ab a Ajinomoto a b P value Energy Amino Acid Energy Amino acid a b Value with different superscript within a row are significantly different (P< 0.05)

7 29 (23-33) 1397 / /, X+#H" Xh#hs Day Metabolizable Energy ( ") & 4! ~6U 3 ",>): a"/ %-&c O+! ),5& 4! 3# )G -5 +I Table 5. Effect of experiment treatments on revenue, total variable cost, gross margin in different periods (Toman) Revenue Total variable cost Gross margin a a a a a b b b b b b a Amino Acid NRC Evonik Ajinomoto P value Energy Amino Acid Energy Amino Acid b b a a ab b a b Values with different superscript within a row are significantly different (P< 0.05).

8 ... J. %-#! +# 3 3!) 21- #H" J; 3E) F" )##( 3:;,&4 :N,1#$ %$7 30 ( "),"* 3%I"I 3!" 3d/ ),5& 4! 3# )G -6 +I Table 6. Effect of experiment treatments on profitable indicators of broiler chickens (Toman) GMSR 1 GMC 2 GMR 3 RCM 4 ACMP 5 Metabolizable Energy b b b a a a a b Amino acid NRC a a a b Evonik ab ab 9.87 ab b Ajinomoto b b 9.31 b a P value Energy Amino acid Amino acid Energy a b Value with different superscript within a row are significantly different (P< 0.05). 1 Gross margin share of total revenue; 2 Gross margin share of total variable cost; 3 Gross margin returns; 4 Return on capital employed; 5 Average cost of meat production 3=&+s %& ) "1. O+-! % W1 "5. LK )K,K&")K#I O+K %K =K# 3%-&c 3KK:; 3!"KK )KK` 4 %KK =1KK %K-# 4 O)K.,&4+! ^,67 )&4 O= )R- -,-0 "$ % a"/ 3%-&c,&"I%>)Y &. XK0HP KM OVK-#h&.+K-. JK7 ))G +", 3 3)#*%M# +", ~6U u$- z&) %5.+ +# %-# 4 ]& ),67 )u#; )K %Kt)* %K. 5 )mq & 4! g&,6. "$% JK; 3)K.,K&")K#I %K-#! +#K 3"8H %,K! 3"K8H +K,K )` % O+- 3)) "" "-#I! & 4! ]& z&) \#"& %K. )K. # ", 3:; *+& 4.+,1 %K-&c K& %& )K =&+s O+#H" +-&!)> %.,"Y -)#I O+ )5#,&4+! V>)Y Ob+ %+ "I O. 3)) L ),&" 3+K#H" 3+Kq {K %K R&); ). %. -f )* Fig. 1. Interaction between metabolizable energy type and patterns of amino acid (Mean ± SD) on total variable cost at 10 days (Toman) (#0 b)s ± ]#8# ) %-#! +# 3"8H #H" J; 3E) F" Jh )G -1 JN ( "),*4 10 )#( %-&c J. )

9 31 (23-33) 1397 / /, X+#H" Xh#hs A%18!,81 )N67 ) )#I 3'( " ~6U Q"P )G.1388.,&4)#. 35 O..F )e Y O. 3)# :3 O +q, W 4! 85,Nc %6M.,"* 3%I"I + %k XY C L ) %-#! +# 3"8H )#I 3E) np )#G.1385.,q.L,-q O.3 "H,P: O.o :37 O)& 345. "67 %6M.,"* 3%I"I )N67 ) 3%6q) %&'( )N67 ) ]#i)d %&'( ~6U 3"8H )#G,) )Ie. {) S O. " 4RI O.o :3 O, X+#H" %&)5.o. 3M 3%&","* 3%I"I %k 3cI +,&D )#I ]#i)d 3E) ~6U Q"P )#G.1392.b S\#. 4Q# O. 3)& 3"# O.,&m O., 4 O)&, "67 3 D %&)5.,"* 3%I"I "/ ) 3+# #H =`6^ %k X#Y":/ O)N67 ) 3%I"I )N67 ) )#I 3'( " :23 3E) =`6^ )G.1380.F "UN#. 4"# O.,#!)# O.,-&+H)#er :5 O,0#1$ "-> "67.]&!,"* %U#! C 4,"* "#$ Xx +-* 3)r 4 =/" J; 3E) ]#U "H+-&.Q,&4)# :106 O, "67 %&)5.3)m %-#! 3+# 3'( " X1#.) L ),7"-:,1:7 %N1 3I % + ). 3&" %,-&c8&i ~6U Q"P )G "H,P:.b, O.C "H":h O. 3) X+#H" Xh#hs.,"* 3%I"I 3:; XY +#H" d/ ) E ]# & ~6U Q"P &" %HM :4 O, -)#I %-#! 3+# #H" J; 3E) # X 3# )#G #&1&.a 3".). O. )"h0&.1-11 :2 O, X+#H" 3 D.,"* 3%I"I 3%k X#Y":/ )N67 ) O,&'^ 3 Ajinomoto Heartland Chicago. Table/ingredients. AOAC Official methods of analysis. 16th ed. Association of Official Analytical Chemists. Arlington. VA. Dale N. and Batal A J-Poultry Web. energy sbm.pps. Accessed on September Dozier W. A., Corzo A., Kidd M. T. and Branton S. L Dietary apparent metabolizable energy and amino acid density effects on growth and carcass traits of heavy broilers. Poultry Science, 16: Evonic Industries Amino Data 3.0, Platinum version. Feed additive. Degussa AG, Hanau-Wolfgang, Germany. Aminodat. com. Kay R., Edwards W. and Duffy P Farm Management. 6th revised Ed. MeGraw-Hill Education. 480 Pages. Lemme A., Ravindran V. and Bryden W. L Ileal digestibility of amino acids in feed ingredients for broilers. Journal of World's Poultry Science, 60: NRC Nutrient Requirements of Poultry. 9 th ed. National Academic Press, Washington DC. 176p. Nudiens J Opportunities of genetic potential of cross Hybro-G broiler chicks using differently enriched feed. Veterinarian Zootechnic Technology, 19: Rezaei M., Teimouri A., Pourreza J. and Syyahzadeh H Effect of diet dilution in the starter period on performance and carcass characteristics of broiler chicks. Journal of Central European Agriculture, 7: Ross Broiler Manangement manual. Aviagen. SAS SAS/STAT 9.2. User's Guide. SAS Institute Inc. Cary, North Carolina. USA. Tahir M. and Pesti G. M Comparison of ingredient usage and formula costs in poultry feeds using different amino acid digestibility databases. Journal of Poultry Science, 21: Wolynetz M. S. and Sibbald I. R Relationship between apparent and true metabolizable energy and the effect of the nitrogen correction. Journal of Poultry Science, 63: Yaghobfar A The efficiency of and utilization for NE in broiler diets. Brazilian Journal of Poultry Science, 18: Yari P., Yaghobfar A., Aghdan Shahryar H., Ebrahimnezhad Y. and Mirzaie Goudarzi S Effects of diets formulation based on different methods of metabolisable energy ( & ) and amino acids (TAA

10 ... J. %-#! +# 3 3!) 21- #H" J; 3E) F" )##( 3:;,&4 :N,1#$ %$7 32 & DAA) expression on Performance, Energy and Protein efficiency ratio and productive efficiency factor of broiler chicks. International Journal of Biological Forum, 7: Zarei A., Mohamadi M. and Hemmati B Metabolizable energy and chemical composition of poultry byproduct meal. Iranian Journal of Applied Animal Science, 4:

11 Animal Production Research Vol. 7, No. 2, 2018 (23-33) Economic evaluation of changing the metabolizable energy system and total amino database in practical feed formulation of broiler chickens A. Tayebi 1*, B. Dastar 2, M. Shams Shargh 3, F. Eshraghi 4 1. MSc. Student of Animal and Poultry Nutrition, Gorgan University of Agricultural Science and Natural Resources, Gorgan, Iran 2. Professor of Animal and Poultry Nutrition, Gorgan University of Agricultural Science and Natural Resources, Gorgan, Iran 3. Associate Professor of Animal and Poultry Nutrition, Gorgan University of Agricultural Science and Natural Resources, Gorgan, Iran 4. Assistant Professor of Agricultural Economics, Gorgan University of Agricultural Science and Natural Resources, Gorgan, Iran Abstract (Received: Accepted: ) Effect of energy expression system and total amino acid database on economical efficiency of Ross 308 broilers strain was studied by 180 broiler chicks in a completely randomized design with a 2 3 factorial arrangement. This study was performed with six treatments, three replicates and 10 broiler chicks in each replicate. Experimental groups included two systems of energy ( and ) and three amino acid database (NRC, Evonik and Ajinomoto) in the periods of starter (1-10 days), grower (11-24 days) and finisher (25-42 days). Dietary formulation with caused significant increase in feed intake ( g) and weight gain ( g) of broilers. In 24 and 42 days, dietary formulation with and then caused increase in revenue and the cost of broilers ration. Dietary formulation according to caused a significant increase in profitability (3690.2), gross profit share of revenue (42.367), profit share of variable costs (74.100) and gross profit returns (10.173) as well as a significant reduction in the cost of meat production (2.19) (P<0.05). Dietary formulation according to NRC and Evonic database resulted in a significant increase in profitability, gross profit share of revenue, profit share of variable costs and gross profit returns as well as a significant reduction in the cost of meat production (P<0.05). Based on the results of current experiment, dietary formulation of broilers based on and NRC and Evonik amino acid database caused relative improvement in net economic return. Keywords: Amino acid patterns, Metabolizable energy, Broiler chick, Diet formulation, Economic profitability * Corresponding author: tayebi.atefeh@yahoo.com