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Distribution of Cerium in the Digestive Tract of the Calf According to Time After Dosing¹

University of Tennessee Agricultural Research Laboratory, Oak Ridge 37830³

ABSTRACT

Radiocerium was used as a marker to follow movement of undigested residues in 120 kg calves fed hay and grain. A different calf was dosed orally at each of the 4-hour intervals from 4 to 72 hours before slaughter with either ¹⁴¹Ce or ¹⁴⁴Ce. All calves received the opposite radiocerium isotope orally 24 hours before slaughter. The 24-hour dose distribution was a standard for adjusting individual distributions at the various time intervals to a common basis. Cerium in the rumen decreased progressively from 80% of the total recovered from the entire digestive tract plus feces at 4 hours to 6% at 72 hours after dosing. Changes in cerium in the omasum were not related to time after dosing. Abomasal cerium decreased from 2% at 4 hours to 0.2% at 72 hours. Cerium in the small intestine peaked above 6% between 8 and 12 hours, plateaued above 4% until 28 hours, then decreased to 0.7% by 72 hours. Cecal cerium contents were similar except the peak occurred 4 hours later. Measurable cerium did not reach the large intestine until 8 hours, peaked at 20% by 20 hours, and decreased to 2% by 72 hours. Cerium recovered in feces increased from 0 at 4 hours to 90% by 72 hours.

¹ This manuscript is published with the permission of the Dean of the University of Tennessee Agricultural Experiment Station, Knoxville.

² Present address: Animal and Range Sciences Department, Montana State University, Bozeman 59715.

³ Operated by the Tennessee Agricultural Experiment Station for the U.S. Atomic Energy Commission under Contract AT-40-1-GEN 242.