Chemically Preserved High-Moisture Corns in Diets for Growing-Finishing Swine

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Abstract
Five trials were conducted to evaluate high-moisture corns treated with chemical preservatives in diets for growing and finishing swine. Propionic: acetic acid mixtures (80:20 or 60:40), propionic acid, isobutyric acid, methylene bis propionate and ammonia were applied to high-moisture corn at time of harvest, and were stored in concrete-floor wooden bins or concrete silos. Nontreated high-moisture corn was stored in sealed silos and portions of the corn were dried at harvest time and stored in grain bins. Propionic acid (.82 or 1.2% by weight), mixtures of propionic-acetic (1.2%), isobutyric acid (1.5%) and methylene bis propionate (.80%) were effective preservatives during the periods studied (October to May). Ammonium hydroxide, applied at a level of .45% ammonia equivalent, was not as effective as the other compounds. However, all corns, whether in mixed diets or fed free-choice with a supplement, were readily consumed by the pigs. Rates of gain and gain/feed (dry matter basis) were similar on all high-moisture diets, which were equal to or better than dry corn diets. Carotene and vitamin E levels of high-moisture corn treated with 1.2% propionic:acetic acids mixture (60:40) were markedly lower after 20 weeks' storage than non-treated samples. Copyright © 1975. American Society of Animal Science . Copyright 1975 by American Society of Animal Science.

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