Volatile Compounds in Blood, Milk, and Urine of Cows Fed Silage-Grain, Bromegrass Pasture, and Hay-Grain Test Meals

Abstract

Two to four cows per treatment were fasted after test meals, their fluids were sampled for 28 to 54 hr, and analyzed by gas liquid chromatography. Methyl sulfide, acetone and butanone occurred and increased during the 1st hr after silage was fed and reached maximal concentrations at about 4.5 hr. Ethanol, however, reached an early maximum during the first hr and a secondary maximum at 4.5 hr.