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Rumen Constituents Affecting Salivary Secretion

U. S. Department of Agriculture^{,3, 4,}

Abstract

Seven steers and two sheep equipped with esophageal and ruminal fistulas were used to study the effect of short-term ruminal infusion of several normal intraruminal constituents such as VFA, VFA sodium salts and water. Within and between animal variation of total mixed salivary secretion was highly significant. Salivary secretion rate showed a tendency to increase during infusion of VFA sodium salts. The infusion of VFA, water, CO₂, saline or pseudo-infusion appeared to have very little effect on salivary secretion rate during the infusion interval. If receptors for a salivary reflex arc are present in the rumen, they are relatively insensitive to the materials infused in these trials.

¹ Present address: Animal Medical Center, 62nd Street and East River Drive, New York, New York.

² Animal Science Department, University of Maryland College Park, Md.

³ The authors express their appreciation to G. E. Whitmore and M. A. Norcross for performing the experimental surgery and for the statistical assistance of R. P. Lehman, Biometrician, Biometrical Services.

⁴ Beef Cattle Research Branch, Animal Husbandry Research Division, ARS, U.S.D.A., Beltsville, Md.