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Effects of Niacin Source on Epinephrine Stimulation of Plasma Nonesterified Fatty Acid and Glucose Concentrations, on Diet Digestibility and on Rumen Protozoal Numbers in Lactating Dairy Cows¹

Department of Animal Sciences, University of Illinois, Urbana, IL 61801

Effects of niacin (nicotinic acid or nicotinamide) supplementation of dairy cow diets on apparent total tract nutrient digestibility, milk yield and milk composition were determined using six mid-lactation Holstein cows in a replicated 3 x 3 Latin square design arranged to test for residual treatment effects. Treatments were control, 12 g/d of nicotinic acid or 12 g/d of nicotinamide. Periods were 14 d long; d 1 to 4 served as an adaptation period before treatment administration commenced (d 5 to 14). Effects of supplemental niacin on plasma nonesterified fatty acid (NEFA) concentrations and plasma glucose concentrations were tested following saline injection on d 10. Blood was then sampled for 5.5 h at 15-min intervals. On d 13, cows were treated similarly except that epinephrine replaced saline. The area below d-10 curves was subtracted from the area below d-13 curves to serve as an indicator of niacin's effect on plasma NEFA and glucose concentration responses to epinephrine injection. Niacin treatments did not change the area differences for plasma glucose compared to the control treatment; however, there was a trend for niacin to reduce the area difference compared to the control treatment for plasma NEFA. Niacin treatments did not alter dry matter intake, nutrient digestibility, milk yield or composition. Niacin supplementation increased the number of entodinia protozoa in rumen fluid.

KEY WORDS: • niacin • cows • epinephrine • protozoa

¹ Supported by Illinois Agricultural Experiment Station, Hatch 35-0371 and a gift from Rhone-Poulenc Inc., Feed Additives Division, Atlanta, GA.

² Present address: Ralston Products, Inc., Suite 101, 6780 Northern Blvd., East Syracuse, NY 13057.

³ To whom reprint requests should be addressed.

Manuscript received 15 September 1989. Revision accepted 31 May 1990.

This article has been cited by other articles:

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