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Rate of Passage of Inert Materials through the Digestive Tract of the Bovine^*

Departments of Dairy and Chemistry, Michigan Agricultural Exp. Station, East Lansing

ABSTRACT

1. The rate of passage of iron oxide through the digestive tract wasstudied in three cows. The rate of passage of rubber rings was studied in six cows.
   
2. The iron oxide first appeared in the feces in from 9 hours and 55 minutes to 13 hours and 20 minutes. The rubber rings first appeared in from 10 hours and 45 minutes to 19 hours and 30 minutes.
   
3. The high point of excretion of the iron oxide was 33 hours and 10 minutes. The high point of excretion for the rubber rings was from 23 hours and 12 minutes to 60 hours and 30 minutes.
   
4. The lag varied from 114 hours and 35 minutes to 156 hours and 5 minutes for the iron oxide and from 141 hours and 52 minutes to approximately 215 hours for the rubber rings.
   
5. It appears that those animals under comparable conditions which first excrete the test material and first reach the high point of excretion show the fastest rate of excretion.
   
6. The feeding of a test material, collection and examination of the feces for 60 hours afterwards gives a comparable method for investigating the rate of passage of inert material.
   

^* Journal Article No. 161 (n.s.) from the Michigan Agricultural Experiment Station.