chromium, alkaline peroxide lignin, markers, grazing, mature forages
Twenty Hampshire ram lambs used in a digestibility trial were administered controlled release chromic oxide intraruminal boluses to evaluate chromic oxide and alkaline peroxide lignin in combination as potential markers for determining intake of ruminants grazing dormant winter range. Lambs were fed ad libitum mature prairie grass hay and provided .1 Ib crude protein from one of four supplements. The ability to predict fecal output using chromic oxide boluses and diet digestibility using alkaline peroxide lignin were not affected by supplemental treatments. Chromic oxide concentration in the feces was not affected by the time of sampling. The amount of chromium oxide excreted averaged 224 mg/day and was not affected by treatment. The amount of lignin consumed that was recovered in the feces was 97.8 + 11.6%. Predicted fecal output was closely related to actual values (R2 = 33, C.V. = 8.4%). Predicted digestibility and dry matter intake were similar to actual values (P = .77 and .90, respectively). Controlled release chromic oxide boluses and alkaline peroxide lignin procedures may be used to predict dry matter intake of ruminants grazing mature forages.
Number of Pages
South Dakota State University
Copyright © 1989 South Dakota State University
Momont, P.A.; Pruitt, R. J.; and Pritchard, R. H., "Evaluation of Controlled Release Chromic Oxide Boluses and Alkaline Peroxide Lignin as Marker Methods to Determine Forage Intake of Grazing Ruminants" (1989). South Dakota Beef Report, 1989. 12.