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Influence of Dose Level and Method of Administration on the Use of Polyethylene Glycol for Determining Fecal Output of Cattle¹

Oklahoma State University, Stillwater 74074

Abstract

FOUR levels (50, 100, 150, and 200 g/day) of polyethylene glycol, MW 3000 to 3700, were administered as a drench, either as a single daily dose or in split doses to yearling steers fed bermudagrass (Cynadon dactylon) hay in metabolism stalls. A 4 x 2 factorial arrangement of treatments was employed. Percent recovery of PEG was highest (99.1%) at the 50 g level given in split doses, and tended to decrease as dose level increased. Method of administration had no significant (P>.01) effect on percent recovery; however, standard deviations tended to be lower for twice-daily dosing. Diurnal variation in PEG concentration tended to be lower for twice daily dosing.

Accuracy and precision of calculated values in estimating measured fecal dry matter output tended to favor the 100 g level in split doses. Twice-daily dosing resulted in less variation at all levels of PEG from 100 to 200 g/day.

¹ Journal Article J2471 of the Agriculture Experiment Station, Oklahoma State University, Stillwater.

² Present Address: Arkansas Agriculture Extension Service, P.O. Box 278, Ashdown, Arkansas 71822.

³ Department of Animal Sciences and Industry, Oklahoma State University.