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Acceptability and Digestibility of Swine Diets Containing Corn Stored under Different Conditions

Coastal Plain Experimental Station, Tifton, GA 31794

Abstract

Two 121-liter plastic containers were filled with about 70 kg of freshly harvested uninoculated U.S. No. 2 corn with 18.8% moisture and no detectable aflatoxins. The containers were purged with gas containing 14.3% CO₂, .5% O₂ and 85.2% N₂, sealed and stored under modified atmosphere for either 36 or 109 days at 25C. Aspergillusflavus and Fusarium moniliforme survived but the aflatoxin contamination was below 15 µg/kg after 109 days storage. Similar corn was treated with .9% propionic acid w/w and stored in a plastic lined box. A third batch of U.S. No. 2 corn was dried to a moisture content of about 10% and stored in a covered bin until used. Three groups of four, 6-week-old pigs per group, were given access to diets which contained corn stored under modified atmosphere, treated with propionic acid or dried to 10% moisture. The pigs were offered the three diets under a cafeteria arrangement. Pigs consumed more (P<.05) feed from diets containing either modified atmosphere stored corn or dried corn than the diet containing corn treated with propionic acid. These three diets also were fed to six, 6-week-old, barrow pigs (initial weight 12.9 kg) in a replicated 3 x 3 latin square design digestion trial. Apparent digestibilities of dry matter, ether extract, crude fiber, ash and NFE were similar (P<.05) for all three diets, however, apparent digestibility of crude protein in the diets containing modified atmosphere stored corn and propionic acid treated corn was greater (P<.05) than that in the dried corn diet.

¹ Departments of Animal Science and Plant Pathology, respectively.

² Stored-Product Insects Research and Development Laboratory, Agricultural Research Service, USDA, Savannah, GA 31403.

³ Reference to a company or product name does not imply approval or recommendation of the product by the U.S. Department of Agriculture to the exclusion of others that may be suitable.