Parameters

Treatment

P-Value

T1

T2

T3

T4

Carcass characteristics

Pre-slaughter, gm

1671.0 ± 23.8

1679.0 ± 19.1

1696.0 ± 18.8

1690.5 ± 32.7

0.8742

Carcass, %

70.58 ± 1.60

70.76 ± 1.76

71.01 ± 0.65

71.08 ± 0.75

0.9516

Dressing, %

75.09 ± 1.64

75.47 ± 1.71

75.86 ± 0.59

75.95 ± 0.80

0.8098

Liver, %

2.33 ± 0.12

2.38 ± 0.05

2.47 ± 0.08

2.50 ± 0.08

0.2177

Kidney, %

0.66 ± 0.02

0.71 ± 0.05

0.68 ± 0.04

0.70 ± 0.01

0.0829

Gizzard, %

1.61 ± 0.07

1.63 ± 0.08

1.71 ± 0.04

1.70 ± 0.08

0.3544

Heart, %

0.48 ± 0.02^c

0.57 ± 0.04^a

0.54 ± 0.05^b

0.54 ± 0.01^b

0.0001

Pancreas, %

0.26 ± 0.05

0.27 ± 0.02

0.27 ± 0.03

0.26 ± 0.02

0.9792

Adrenal, %

0.007 ± 0.002

0.008 ± 0.004

0.009 ± 0.005

0.009 ± 0.002

0.2062

Abdominal fat, %

1.26 ± 0.09

1.10 ± 0.17

1.18 ± 0.09

1.04 ± 0.03

0.5171

Cecum length, cm

25.20 ± 1.75

26.72 ± 1.58

26.10 ± 1.34

26.00 ± 1.27

0.7722

Cecum, %

0.80 ± 0.02^c

0.95 ± 0.06^b

1.04 ± 0.05^a

0.90 ± 0.04^b

0.0001

Intestine length, cm

185.2 ± 6.09^c

191.6 ± 6.95b^c

194.0 ± 7.40^a

192.40 ± 4.48^ab

0.0049

Intestine, %

5.34 ± 0.22^c

5.78 ± 0.19^b

6.12 ± 0.28^a

5.44 ± 0.10^c

0.0004

Immune organs

Spleen, %

0.10 ± 0.01

0.14 ± 0.02

0.13 ± 0.04

0.13 ± 0.01

0.0629

Thymus, %

0.231 ± 0.002

0.237 ± 0.005

0.338 ± 0.003

0.235 ± 0.002

0.0518

Bursa, %

0.08 ± 0.01

0.07 ± 0.01

0.10 ± 0.02

0.08 ± 0.01

0.0721

Tibia characteristics

Tibia, %

0.76 ± 0.03

0.78 ± 0.04

0.85 ± 0.04

0.77 ± 0.02

0.0785

Tibia length, cm

9.02 ± 0.05^b

9.27 ± 0.04^a

9.27 ± 0.12^a

9.12 ± 0.14^c

0.0401

Tibia width, cm

0.78 ± 0.03^b

0.82 ± 0.05^b

0.88 ± 0.08^a

0.83 ± 0.03^ab

0.0222