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B-Vitamin Studies in Calves. I. The Relation between Age of Calf and Levels of Thiamine, Riboflavin and Nicotinic Acid found in the Digestive Tract^1,2

The Pennsylvania Agricultural Experiment Station, State College

ABSTRACT

Chemical assays of thiamine, riboflavin and nicotinic acid were performed on the contents of the digestive tracts of calves slaughtered at various ages from 2 to 14 wk. Levels of all three vitamins generally were higher in all parts of the tract than in the feed the animals had received. Riboflavin and niacin were found in greater concentrations in the small intestine than in other regions of the tract. Thiamine was found in highest amounts in the rumen and omasum. Under the conditions of this experiment, no relationship could be noted between the age of the calf and levels of B-vitamins in the digestive tract.

¹¹ Taken from data presented in a thesis to the graduate faculty of The Pennsylvania State College by E. M. Kesler in partial fulfillment of the requirements for the degree of Doctor of Philosophy.

² Authorized for publication as paper no. 1614 in the Journal series of the Pennsylvania Agricultural Experiment Station, on August 9, 1950.