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Blood and Rumen Changes Following the Intra-Ruminal Administration of Glycogenic Materials¹

Department of Animal Husbandry, Cornell University, Ithaca, New York

ABSTRACT

An over-all study was made of blood and rumen changes taking place in fistulated steers following intraruminal administration of propylene glycol, sodium propionate, sodium lactate, calcium lactate, mixed lactates, and sucrose. Additional specific studies were made on the relative proportions of administered sodium lactate that were fermented and absorbed, and on the glycogenic effect of various propionate-butyrate mixtures.

Propylene glycol gave the greatest response in blood glucose. Propionate increased blood glucose more than any of the lactate treatments. Sucrose did not escape fermentation and rumen intermediates were not favorable for increasing blood glucose.

Lactate absorption increased while lactate fermentation decreased with increasing solubility of the lactate administered. Lactate fermentation resulted in the greatest increase, based on molar ratios, in propionic acid followed by butyric acid and lastly by acetic acid. Higher rumen concentration of lactate increased the percentage loss by absorption and decreased the percentage loss by fermentation. The loss by fermentation remained nearly constant when rumen concentrations ranged from 200 to 1,000 mg.%, with little absorption occurring below 200 mg.%

Intraruminal dripping of propionate-butyrate mixtures showed gradual increases of blood glucose and decreases of blood ketones as the proportion of propionate increased.

¹ The data published in this paper are from a thesis presented by the senior author to the graduate school, Cornell University, in partial fulfillment of the requirements for the degree of Doctor of Philosophy, September, 1957.

² Present address: Dairy Cattle Research Branch, USDA, Beltsville, Md.

³ Present address: Department of Dairy Husbandry, University of Wisconsin, Madison 6, Wisconsin.

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