Table 2 Effects of usnic acid and tannic acid on broiler growth performance with NE

43.78 ± 0.281

43.84 ± 0.327

43.95 ± 0.157

43.70 ± 0.327

0.934

461.20 ± 2.524^b

493.75 ± 10.097^a

482.13 ± 2.822^a

479.56 ± 4.298^a

0.009

904.44 ± 9.626^c

1,013.37 ± 10.065^a

950.18 ± 13.264^b

971.49 ± 8.972^b

 < 0.01

1,587.56 ± 15.922

1,684.08 ± 13.269

1,636.01 ± 27.208

1,637.11 ± 28.413

0.054

3,059.37 ± 40.471

3,185.31 ± 59.767

3,116.81 ± 42.648

3,177.57 ± 58.160

0.376

443.24 ± 10.346 ^cd

533.34 ± 7.912^a

468.05 ± 14.550^bc

491.92 ± 10.835^b

0.005

672.86 ± 12.672

670.71 ± 7.195

685.83 ± 19.840

665.62 ± 21.679

0.446

1,471.81 ± 30.384

1501.24 ± 53.323

1,485.70 ± 22.826

1,480.95 ± 56.149

0.971

517.51 ± 2.837

532.94 ± 7.856

534.03 ± 2.627

526.34 ± 5.477

0.132

668.14 ± 7.965^b

736.84 ± 13.863^a

722.92 ± 17.524^a

710.29 ± 17.810^ab

0.027

1,185.66 ± 8.935^b

1,271.14 ± 19.371^a

1,256.94 ± 18.041^a

1,236.63 ± 18.408^a

0.012

985.12 ± 17.387

960.67 ± 5.164

996.14 ± 24.730

979.00 ± 26.786

0.186

2,170.78 ± 23.451

2,228.57 ± 21.359

2,253.08 ± 42.011

2,215.63 ± 35.970

0.351

2,479.74 ± 50.071

2,514.67 ± 66.336

2,473.12 ± 12.986

2,431.31 ± 29.590

0.700

4,650.52 ± 70.459

4,741.87 ± 74.600

4,694.68 ± 40.249

4,730.05 ± 81.642

0.776

1.240 ± 0.0022^a

1.222 ± 0.0076^ab

1.219 ± 0.0067^ab

1.208 ± 0.0086^b

0.028

1.509 ± 0.0203^a

1.382 ± 0.0169^c

1.498 ± 0.0206^ab

1.474 ± 0.0195^ab

0.001

1.378 ± 0.0078^a

1.311 ± 0.0082^c

1.365 ± 0.0055^ab

1.333 ± 0.0020^bc

0.004

1.456 ± 0.0140

1.428 ± 0.0132

1.466 ± 0.0029

1.463 ± 0.0060

0.129

1.406 ± 0.0068^a

1.359 ± 0.0057^b

1.400 ± 0.0061^a

1.391 ± 0.0114^a

0.003

1.685 ± 0.0050

1.654 ± 0.0089

1.661 ± 0.0222

1.673 ± 0.0352

0.816

1.542 ± 0.0044

1.510 ± 0.0107

1.529 ± 0.0161

1.510 ± 0.0125

0.145

3.75 ± 1.531

2.50 ± 1.531

5.00 ± 2.339

2.50 ± 2.500

0.456