Table 1 Effect of atmospheric ammonia on the body weight gain, feed intake, feed-conversion ratio and immune organ indices of broilers

Body weight gain (g/day)

91 ± 3.6^a

77 ± 2.5^b

Feed intake (g/day)

150 ± 1.9^a

135 ± 2.8^b

Feed-conversion ratio^c

1.64 ± 0.09^b

1.75 ± 0.05^a

Index of bursal (%)^d

0.73 ± 0.06

0.61 ± 0.05

Index of spleen (%)^d

1.07 ± 0.04^a

0.75 ± 0.02^b

Index of thymus (%)^d

2.35 ± 0.50

2.19 ± 0.44

Index of intestine (%)^d

3.70 ± 0.15^a

2.67 ± 0.11^b