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Ovine Lactic Acidosis: Intraruminal and Systemic^{1, 2,}

University of Missouri^{,5, 6,}— Columbia, Columbia 65201

Abstract

Excessive grain consumption by ruminants causes a condition described as overingestion, acute indigestion, grain engorgement, and lactic acidosis, the term used in this study.

In 1863, Reiset, as cited by Hungate (1966), stated that ruminants not accustomed to a grain diet often suffer acute digestive disturbances, and in many cases death, within 24 hr. after consumption of large quantities of grain. Recent research has been concerned primarily with events taking place in the rumen and the gross symptoms of the syndrome.

Lactic acid is known to be increased in the rumen from 1 to 1,500 mg/100 ml (Uhart and Carrol, 1967; Walker, 1968) and in the blood from 4.5 to 90 mg/100 ml (Heuter, Shaw and Doetsch, 1956; Dunlop and Hammond, 1965) following the consumption of large amounts of grain. Furthermore, a large proportion of the lactic acid produced is D(—) lactate, which may not be metabolized systemically (Dunlop and Hammond, 1965: Ryan, 1963, 1964; Hinkson, Hoover and Poulton, 1967).

¹ Contribution from the Missouri Agricultural Experiment Station. Journal Series No. 6059. Approved by the Director.

² This research was presented by the senior author in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the University of Missouri, Columbia.

³ Present Address: 2318 Laporte Avenue, Fort Collins, Colorado 80521.

⁴ Present Address: Department of Animal Science, OARDC, Ohio State University, Wooster 44691.

⁵ Department of Animal Husbandry.

⁶ The assistance given by Wayne Reichert, Charles Devier, John Yeast and Orval Lewis is gratefully acknowledged.

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