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Effect of Intraruminal Infusion of Volatile Fatty Acids and Lactic Acid on Voluntary Hay Intake^{1, 2, 3,}

Department of Dairy Science, University of Wisconsin, Madison

ABSTRACT

Four rumen-fistulated cows were used to determine the effect of intraruminal infusion of certain rumen metabolites on voluntary hay consumption by dairy cows.

The infusion of acetic acid significantly decreased daily hay consumption. When the acetic acid was supplied as the sodium salt or when partially neutralized to pH 5.0 with sodium hydroxide, there was only a small reduction in hay intake. There was no change in the blood sugar, ketones, CO₂, or pH. There was a slight decrease in blood urea, suggesting that the acid absorbed into the blood stream was being neutralized by the urea, which would prevent a drop in blood pH.

Propionic acid infusion did not result in a significant decrease in hay consumption, although the results were quite variable. Butyric acid caused only moderate decreases in voluntary hay intake with very little, if any, carry-over effect.

Infusion of lactic acid caused a slight decrease in the intake of hay and an increase in the per cent butyric acid in the rumen.

Results of in vitro rate of cellulose digestion suggest that there is very little difference in the ability of the microorganisms, taken from the rumen of cows of varying hay intake, to digest cellulose.

¹ Published with the approval of the Director of the Wisconsin Agricultural Experiment Station.

² Data presented are taken, in part, from the thesis presented by M. J. Montgomery to the Graduate School, University of Wisconsin, in partial fulfillment of the requirements for the Master of Science degree.

³ Conducted as part of a contributing project to NC-63, Biochemistry of Forage Utilization by Cattle and Sheep.

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