Can faecal markers detect a short term reduction in forage intake by cattle?

Detection of a reduction in forage intake is particularly relevant in grazing animals due to its negative effect on animal performance. Estimations of intake reduction using faecal markers can be inaccurate due to the time delay between a change in forage intake and the subsequent change in faecal output. This delay may vary depending on forage quality and marker type. A pen study was conducted for 29 days to test the efficacy of liquid (PEG=polyethylene glycol) and solid (alkanes and CrCl=chromium chloride) phase faecal markers to detect a reduction in intake by steers of diets that varied in forage quality. Ten Brahman cross steers (296±16kg) were allocated equally to diets of leafy, high quality buffel grass (Cenchrus ciliaris) hay and stemmy, low quality buffel grass hay. Hay was offered ad libitum from day 1 to 7, at 90% of voluntary intake from day 8 to 14 and then reduced by 8% each day from day 15 to 24. On day 5 each steer was dosed with two slow release alkane capsules; also, steers received a single daily dose of PEG and CrCl at 09:00 on days 5-24. Actual and marker derived estimates of forage intake over days 10-22 were assessed by repeated-measures analysis of variance. Overall marker recovery rates were satisfactory (0.92-1.03) and there was a significant (