. 2015 May 15;6:465. doi: 10.3389/fmicb.2015.00465

Table 1.

Efficiency of rumen microbial growth.

Organism	Efficiency
	g microbial DM (mol ATP)⁻¹^a	% of theoretical maximum^b
Mixed rumen microbes, in vivo	11–21	34–66
Mixed rumen bacteria, in vitro	7.5–16.7	23–52
Pure cultures, in vitro	10–25	31–78

Summarized from Russell and Wallace (1997).

31.9 g (g microbial DM mol ATP)⁻¹; value from Stouthamer (1973) for growth with glucose, amino acids, and nucleic acid bases.