Rumino Reticular VFA Content of Pronghorn Antelope

Abstract

Molar concentrations and percentage distributions of short chain fatty acids obtained from various age-classes and sexes of pronghorn antelope (Antilocapra americana) were investigated. The concentrations of the acids and their percentage distribution seem to correspond to data obtained on domestic ruminants on somewhat comparable diets. Some statistically significant differences (P < 0.05) were obtained on the percentage distribution of the acids of adults and fawns. Volatile fatty acids (VFA) are metabolites produced by the microbial fermentation of forages in the rumino-reticulum of ruminant animals. Once thought to be of minor significance, these acids are known now to supply the major source of energy to the ruminant. A considerable amount of information is available on VFA production, concentration, and the ratios of individual acids in the rumen of domestic animals (Annison and Lewis 1959), but less is known concerning wild ruminants. Short et al. (1966) presented data on seasonal variations in VFA in the rumen of mule deer Odocoileus hemionus. The purpose of this paper, therefore, is to present some information on the concentration and ratios of VFA in different age classes of the pronghorn antelope. The authors wish to acknowledge the help of the Colorado Department of Game Fish and Parks personnel and the excellent cooperation of Colorado hunters.