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Dairy Waste Management Systems

Department of Agricultural Engineering, University of Minnesota, St. Paul 55101

ABSTRACT

Controlling odor of stored animal waste and its satisfactory disposition are two of the most difficult problems facing dairymen. Waste handling systems may range from a gutter cleaner and daily hauling with manure spreader to extended storage in concrete tanks whose contents are pumped and spread periodically. Daily hauling requires the lowest investment in equipment but has the disadvantage of higher labor costs and the hazard of unfavorable weather, soil, or crop conditions. Slat floors in warm free-stall barns with under-the-building manure storage offer a suitable system for manure handling with a minimum of labor. Carefully planned ventilation systems of high capacity must be provided for all confined units. Research shows that manure containing little bedding deposited in the end of a 9.1 x 27.4 x 2.4-m external flat-bottom tank will distribute itself under its own weight. Waste heat from the dairy barn ventilation system will prevent freezing.