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Evaluation of Methods for Introducing Materials Directly into the Abomasum of Yearling Cattle¹

Agricultural Research Laboratory of the University of Tennessee,³ Oak Ridge 37830

ABSTRACT

Procedures for introducing a nonabsorbed marker directly into the abomasum were evaluated with 10- to 22-month-old cattle. Excretions of ¹⁴¹Ce surgically placed into the abomasum and ¹⁴¹Ce placed by gelatin capsule into the rumen of the same animals were compared in eight animal trials. Cerium-144, which began its passage from the abomasum, was almost entirely voided within 30 hr, whereas some ¹⁴¹Ce excretion still occurred after 100 hr. Times required for 5, 50, and 90% excretions averaged 15, 18, and 23 hr for abomasal ¹⁴⁴Ce doses and 26, 43, and 90 hr for rumen ¹⁴¹Ce doses. Comparison of excretion patterns in other experiments with those described above showed whether a dose entered the abomasum or the rumen. Swabbing the animal's throat with dilute copper sulfate before dosing by syringe diverted very little of the dose to the abomasum. When radiocerium in milk or water at 37 or 18 C was suckled from nipple pails, it entered the abomasum. Gelatin capsules also entered the abomasum when administered immediately after suckling and followed by additional suckling.

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

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

³ Operated by the Tennessee Agricultural Experiment Station for the U.S. Atomic Energy Commission under Contract no. AT-40-1-GEN-242.