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Table 2. The body weight and FCR of different broiler strains during 42 days’ period.

Parameters

Week

Cobb 500

Ross

IR

EP

p-value

Body weight

Initial

42.33±0.33

42.83±0.17

42.67±0.33

42.67±0.33

0.10

1st Week

155.27a±1.79

152.33ab±0.33

146.73b±2.90

136.60c±0.42

<0.001

2nd Week

476.67a±7.54

471.33a±1.86

451.00b±4.58

441.67b±4.41

0.003

3rd Week

956.33±2.40

944.33±8.09

965.33±69.84

909.00±6.66

0.699

4th Week

1577.80±49.36

1446.33±28.81

1540.00±85.05

1433.00±9.07

0.209

5th Week

2218.60a±43.60

2074.17ab±34.60

2116.00b±51.39

1990.33b±5.49

0.017

6th Week

2825.33a±22.36

2725.00b±17.56

2641.67c±19.22

2566.67d±8.82

<0.001

FCR

1st Week

0.99c±0.02

1.06b±0.00

1.08b±0.04

1.24a±0.01

<0.001

2nd Week

1.01c±0.01

1.11bc±0.01

1.17b±0.08

1.30a±0.02

0.005

3rd Week

1.09b±0.01

1.13b±0.02

1.21ab±0.09

1.32a±0.01

0.025

4th Week

1.16c ±0.04

1.41ab±0.07

1.28bc±0.06

1.52a±0.01

0.005

5th Week

1.48±0.07

1.47±0.04

1.69±0.14

1.77±0.02

0.061

6th Week

1.77c±0.07

1.55b±0.03

1.89ab±0.06

1.96a±0.02

0.002

Final FCR

1.33c±0.96

1.36c±1.31

1.45b±0.74

1.60a±1.47

0.023

One-way ANOVA with Duncan multiple range test (DMRT); abcSuperscripts indicate significant variation among the group. Significance level p<0.05