Abstract
Orchard grass, alsike clover, and an alfalfa–brome mixture were field treated before baling with either formic acid, acetic acid, propionic acid, ChemStor, or HaySavor at levels between 0.05–0.11% on a fresh weight basis. The temperature of the untreated orchard grass hay was 137 F (58 C) and mold was visible after 3 days; formic acid-treated orchard grass hay was 102 F (39 C) and showed traces of mold; no mold was visible in the ChemStor-treated orchard grass bales and temperature was 91 F (33 C). Acetic acid treatment seemed to encourage mold growth in alsike clover hay over 30% moisture at the time of baling. Dry matter (DM) intake by sheep was significantly higher (P < 0.05) for the untreated hay compared with the propionic acid-treated alfalfa–brome hay. The lowest intake was with the formic acid-treated hay. Acid treatment did not significantly affect (P > 0.05) the DM digestibility of the alfalfa–brome hay, although the untreated hay had a higher DM digestibility than the acid-treated hay in the same treatment square.
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