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Further Observations on the Relationship of Bloat in Cattle to Respiratory Inhibition in vitro by Alfalfa Saponins^1,2,

Purdue University Agricultural Experiment Station, Lafayette, Indiana

Abstract

Twenty-two Hereford cattle, which showed some signs of bloat in a 2-day preliminary grazing period, were divided into three herds. Herds A and B (eight animals each) alternately grazed the Culver and Vernal pastures, while Herd C (six animals) grazed only the Vernal pasture during the six 4-day experimental periods. Samples of the forages were collected each afternoon for the first four experimental periods.

The inhibitory effect of forage fractions on tissue respiratory in vitro was compared with the bloat index of the forage and data show no evidence of a correlation between the two.

Biological and chemical properties of the purified respiratory inhibitor(s) from Culver and Vernal alfalfa differed somewhat from those of Ranger alfalfa and of Ladino clover.

¹ Contribution from the Department of Biochemistry and the Department of Veterinary Physiology and Pharmacology, Purdue University as Journal Paper No. 1940. Taken in part from a thesis presented by S. A. McNairy, Jr. to the Graduate School in partial fulfillment of the M.S. degree in June, 1962.

² We wish to thank R. L. Morter and S. L. Nelson for treating a number of the cases of bloat observed.