Table 5. The effect of dietary yeast hydrolysate supplementation on gas emission of broilers

Items (ppm)	YH supplementation (%)			SEM	p-value
	0	0.1	0.2		Linear	Quadratic
Day 35
NH3	14.5	13.8	11.5	1.6	0.069	0.941
H2S	2.8	2.1	1.5	0.4	0.027	0.708
Methyl mercaptans	9.0	7.3	6.5	1.8	0.371	0.831
CO2	1,725	1,525	1,425	248	0.426	0.875
Acetic acid	4.5	3.3	2.5	0.9	0.164	0.827

YH, yeast hydrolysate.