Summary
Aerobic culture with solid substrates of fresh swine waste combined with corn resulted in lactic acid fermentation with odor control. Heterofermentative lactic acid bacteria produced lactic and homologous tatty acids from acetic through valeric acid (0.1 meq/dry g) to reduce pH 2 units to 4.2 to 4.6. During the fermentation, lactic acid organisms increased from 107 to 109/dry g. Coliform organisms remained steady in number at 106 organisms/dry g. Pilot-plant scale fermentation produced a product with 21 to 39% more methionine than corn but was still limiting for this amino acid as well as lysine for young pigs. Fermentation product from fresh waste-corn cultures was fed as the major dietary component to young pigs, hens, and sheep. Pigs showed gain and gain/feed diminished by one-third in 13-day trials. Laying hens performed comparably to controls in a 21-day test, and sheep did not discriminate against fermentation product.
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Weiner, B.A. Fermentation of swine waste-corn mixtures for animal feed: Pilot-plant studies. European J. Appl Microbiol. 4, 59–65 (1977). https://doi.org/10.1007/BF01390671
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DOI: https://doi.org/10.1007/BF01390671