Table 5.

Correlations between ruminal microbial population and gas production parameters, VFA

Item	VF	FRD0	t0.5	Acetate (% of tVFA)	Propionate (% of tVFA)	Isobutyrate (% of tVFA)	Butyrate (% of tVFA)	Isovalerate (% of tVFA)	Valerate (% of tVFA)	tVFA	A/P
F. succinogenes	0.826	−0.878	0.905*	0.131	−0.200	−0.489	−0.333	−0.210	0.352	0.567	0.162
R. albus	−0.078	−0.153	−0.037	0.801**	−0.837**	−0.552	−0.479	0.326	0.631	0.732*	0.845**
B. fibrisolvens	0.820	−0.749	0.783	0.427	−0.509	−0.426	−0.254	0.122	0.591	0.842**	0.462
R. flavefaciens	0.390	−0.323	0.293	0.228	−0.072	−0.488	−0.341	−0.399	0.468	0.529	0.157
Fungus	0.814	−0.729	0.750	−0.081	0.249	−0.367	0.223	−0.849	0.172	−0.271	−0.271
Methanogen	0.456	−0.372	0.411	0.590	−0.590	−0.497	−0.374	0.126	0.558	0.742*	0.597
Protozoa	0.942*	−0.901*	0.832	−0.177	0.379	−0.077	0.073	−0.688*	−0.628	−0.314*	−0.358

F. succinogenes, Fibrobacter succinogenes; R. albus, Ruminococcus albus; B. fibrisolvens, Butyrivibrio fibrisolvens; R. flavefaciens, Ruminococcus flavefaciens; VFA, volatile fatty acid; V_F, the theoretical maximum of gas production; FRD₀, the initial fractional rate of degradation; t_0.5, the time at which half of the final gas production; tVFA, total VFA; A/P, acetate to propionate ratio.

^*p<0.05;

^**p<0.01.