Fig 2. Descriptive data for diurnal patterns of trough use.

The mean ± SEM amounts of time heifers spent using the (A) gated or (B) open feed trough are shown by hour of the day. At 0800 h, all heifers were fed Sudan grass hay behind a weighted gate that must be pushed open to gain access. The primary diet treatments were delivered to the open trough at 0800 and 1400 h, and consisted of either a total mixed ration with 12% forage (as fed, low roughage, n = 6) or 100% Sudan grass hay (high roughage, n = 6).