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Relation between Age of Calf, Blood Glucose, Blood and Rumen Levels of Volatile Fatty Acids, and in Vitro Cellulose Digestion^{1, 2,}

Department of Dairy Science, Pennsylvania State University, University Park

ABSTRACT

Blood and rumen juice were collected from 18 male Holstein calves at 1 week of age and every week thereafter until 15 weeks of age. Results of the analyses show a lowering of blood glucose levels concurrent with increasing levels of blood volatile fatty acids. At the same time, rumen juice volatile fatty acids and per cent in vitro cellulose digestion increased as the calves advanced in age. The significance of these findings and the possible relationship between these factors are discussed.

¹ Authorized for publication as Paper No. 2019 in the Journal Series of the Pennsylvania Agricultural Experiment Station.

² Taken from a thesis presented by R. D. McCarthy to the Graduate School of the Pennsylvania State University in partial fulfillment of the requirements for a Master of Science degree.

³ Present address: Dairy Department, University of Maryland, College Park.