Table 2
Effect of cashew nut shell liquid and monensin supplementation under different dietary conditions on in vitro gas production

Gases mL/culture	Forage to concentrate ratio										P-value
	9:1		7:3		5:5		3:7		1:9		P-value
	Control	Treatment	Control	Treatment	Control	Treatment	Control	Treatment	Control	Treatment	Additive	Diet	A × D
Cashew nut shell liquid
Total gas	4.00^abc	3.58^bc	4.84^ab	4.27^abc	4.87^ab	3.32^c	5.08^a	3.56^bc	4.81^ab	3.69^abc	<0.001	0.173	0.213
CO₂	3.44^ab	2.96^ab	3.95^ab	3.72^ab	3.93^ab	2.81^b	4.08^a	3.01^ab	3.78^ab	3.18^ab	<0.001	0.200	0.349
CH₄	0.54^bc (100)	0.60^bc (111)	0.88^abc (100)	0.54^c (61)	0.93^ab (100)	0.50^c (54)	0.98^a (100)	0.53^c (54)	1.02^a (100)	0.50^c (49)	<0.001	0.103	0.008
H₂	0.01	0.02	0.01	0.02	0.01	0.01	0.01	0.01	0.01	0.01	0.744	0.466	0.428
Monensin
Total gas	4.62	4.44	5.75	4.80	5.47	4.82	5.17	4.68	5.31	4.39	0.009	0.442	0.742
CO₂	3.61	3.30	4.47	3.71	4.03	3.69	3.79	3.66	3.96	3.50	0.059	0.535	0.875
CH₄	1.13^ab (100)	1.14^ab (101)	1.27^a (100)	1.08^ab (85)	1.43^a (100)	1.12^ab (85)	1.36^a (100)	1.01^ab (78)	1.35^a (100)	0.73^b (54)	<0.001	0.295	0.092
H₂	0.01	0.01	0.02	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.001	0.642	0.949