Figure 1.
Figure 1.

Feedlot pen showing side-by-side placement of GrowSafe feed bins and GreenFeed emission monitors for recording individual animal feed intake and enteric methane production, respectively.

 


Figure 2.
Figure 2.

Methane production rate (MPR) vs. feed DMI by Angus cattle measured first on ad libitum access to feedlot grain ration (MPR = 4.1 [93.3; SE] × DMI + 93.3; R2 = 0.08; N = 41: red circles), then restricted access to grain ration (MPR = 8.4 [45.6] × DMI + 45.5; R2 = 0.30; N = 59: blue squares), and then restricted allocation of roughage ration (MPR = 16.4 [19.2] × DMI + 19.2; R2 = 0.37; N = 57: yellow triangles).