TABLE 3.

Effect of heat stress and L-citrulline supplementation on organ index of broiler chicken.

Experimental groups	Final BW (g)	Heart (%)	Bursa (%)	Thymus (%)	Liver (%)	Kidney (%)	Spleen (%)
TNZ + control	444.54 ± 9.92	0.66 ± 0.02	0.35 ± 0.04	0.45 ± 0.03	2.60 ± 0.06	0.56 ± 0.05	0.19 ± 0.02
TNZ + L-Cit	455.04 ± 16.54	0.61 ± 0.03	0.29 ± 0.04	0.49 ± 0.04	2.80 ± 0.10	0.48 ± 0.04	0.12 ± 0.02
HS + control	451.29 ± 21.78	0.67 ± 0.02	0.35 ± 0.04	0.39 ± 0.03	2.79 ± 0.07	0.52 ± 0.05	0.17 ± 0.02
HS + L-Cit	451.50 ± 10.77	0.66 ± 0.02	0.39 ± 0.03	0.46 ± 0.03	2.71 ± 0.07	0.57 ± 0.05	0.14 ± 0.01
Main effect
Environment
TNZ	449.79	0.63	0.32	0.47	2.70	0.52	0.15
HS	451.39	0.66	0.37	0.43	2.75	0.55	0.15
Diets
Control	447.91	0.66	0.35	0.42	2.70	0.54	0.17
L-Cit	453.27	0.63	0.34	0.48	2.76	0.52	0.13
P-Value
Environment	0.918	0.242	0.852	0.217	0.426	0.763	0.844
Diet	0.732	0.237	0.174	0.084	0.524	0.524	0.011
Interaction	0.743	0.389	0.178	0.755	0.069	0.187	0.347

TNZ + control, thermoneutral + control diet; TNZ + L-Cit, thermoneutral + 1% L-citrulline diet; HS + control, heat stress + control diet; HS + L-Cit, heat stress + 1% L-citrulline diet; BW, body weight.