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Journal of Dairy Science Vol. 60 No. 3 416-423
© 1977 by American Dairy Science Association ®
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Microbial Population Changes and Fermentation Characteristics of Ensiled Bovine Manure-Blended Rations

E. F. Knight1, T. A. McCaskey, W. B. Anthony and J. L. Walters

Department of Animal and Dairy Sciences, Agricultural Experiment Station, Auburn University, Auburn, AL 36830

ABSTRACT

Manure from beef steers confined on concrete was blended with a basal ration at 20, 40, and 60% and ensiled at 25 C. The moisture content of the rations increased with manure added. The rations with higher moisture developed a lower pH and higher lactic acid during the 10-day ensiling. Coliform bacteria were not detected in rations with 40% and 60% manure after 5 days ensiling and after 10 days in the 20% manure-blended ration. Coliform count of the basal ration (no manure) remained constant at about 104/g. When pH dropped to 4.4 to 4.7, coliforms died in all manure-blended rations. Salmonellae were isolated twice from 66 samples of the manure-blended rations and ration constituents (basal ration and manure) prior to ensiling. Salmonellae were not recovered from the salmonellae positive manure-blended rations after 3-days ensiling. The total bacterial count, numbers of acid-producing bacteria, and numbers of yeasts and molds decreased in the manure-blended rations after 10 days ensiling. Sporeform-ing bacteria survived but did not proliferate in the ensiled rations. The predominant acid-producing bacterium in the manure-blended rations prior to ensiling was Streptococcus faecalis. After 10 days ensiling Lactobacillus plantarum was the predominant type.

FOOTNOTES

1 National Sales, Inc., P. O. Box 1019, Jackson, MS 39205.






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Copyright © 1977 by the American Dairy Science Association ®.