Table 9.

Effect of glycine on the serum DAO, D-LA, and LPS of heat-stressed broilers.

								Effect of glycine under HT
	Treatments1						CON vs. HT	P Value
Items	CON	HT	0.5%Gly	1%Gly	2%Gly	SEM	P Value	Main effect	Linear	Quadratic
DAO (ng/mL)	2.87	3.06	3.23	3.19	2.55	0.137	0.675	0.263	0.189	0.142
D-LA (μmol/mL)	8.07	7.69	6.80	7.73	6.37	0.811	0.796	0.926	0.697	0.893
LPS (EU/L)	23.38	33.82	21.21	20.97	20.89	2.174	0.002	0.017	0.053	0.126

Abbreviations: DAO, diamine oxidase; D-LA, D-lactate; LPS, lipopolysaccharide.

¹CON: basal diet and raised under thermoneutral conditions; HT: basal diet and raised under cyclic high-temperature conditions; 0.5% Gly, 1.0% Gly, 2.0% Gly: basal diet supplemented with 0.5%, 1.0%, 2.0% glycine under cyclic high-temperature conditions (n = 6).