Figure 1.

Concentration of plasma urea nitrogen (PUN) in finishing steers consuming a control (7% hay, 15% Sweet Bran, 67.25% rolled corn, 5% liquid supplement, 5% dry supplement, 0.75% urea) or cotton byproduct (7% cotton gin trash, 15% whole cottonseed, 72.25% rolled corn, 5% dry supplement, 0.75% urea) diet. A treatment × day interaction (P = 0.04), a treatment effect (P < 0.01), and a day effect (P < 0.001) were observed for PUN concentrations. An asterisk (*) represents a difference (P < 0.05) between treatments on that day. Cattle were harvested in 2 groups: day 140 (n = 4 pens per treatment) and day 168 (n = 4 pens per treatment). In this figure, 140 days on feed is representative of the final measurement, regardless of harvest date.