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Rumen Development in Lambs. III. Microbial B-Vitamin Synthesis¹

University of Kentucky, Lexington 40506

Abstract

Thirty-two lambs were randomly allotted into four groups of eight each at birth. Rumen samples were taken at 3, 6, 10, 14 and 21 days of age. These samples were analyzed for riboflavin, thiamine, pantothenic acid, niacin, biotin and folic acid. For the B-vitamins reported in this experiment, the initial level at 3 days of age appeared stable due to colostrum intake. Following the initial levels reported, there was a decline in pantothenic acid, niacin and biotin concentrations to 21 days of age. Riboflavin concentration in the rumen was significantly increased by creep feeding lambs maintained in confinement. Differences in ruminal concentrations of other B-vitamins between non-creep and creep-fed lambs could be largely accounted for by the vitamin content of the creep feed consumed.

¹ The investigation reported in this paper (No. 71-5-73) is in connection with a project of the Kentucky Agricultural Experiment Station and is published with the approval of the Director.

² Present address: Indiana Farm Bureau, Indianapolis, Indiana.