. 2015 Sep 3;29(2):211–218. doi: 10.5713/ajas.15.0166

Table 6.

Least squares mean (±SE) of methane production during in vitro oat straw rumen fermentation

Item	Treatment			SEM	Trend²		Treatment effect

	Time (h)	Control	Yeast		L	Q
Methane (mL)	4	45.00^a	28.78^a	11.53	NS	NS	NS
	8	66.00^a	15.06^b	11.53			**
	12	33.05^a	15.91^a	11.53			NS
	24	29.93^a	13.12^a	11.53			NS
	36	34.50^a	24.94^a	11.53			NS

SEM, standard error of the mean; L, linear trend across fermentation times; q, quadratic trend across fermentation times; NS, non significant.

Different letters in the same row indicate significant differences (* p 0.05; ** p 0.01; *** p 0.001) between treatments.

Means (n = 40) in rows with the same superscript are not significantly different (ns) due to treatment effect.