Inactivation ofGiardiaCysts andCryptosporidiumOocysts in Beef Feedlot Manure By Thermophilic Windrow Composting
| Autor: | Tim A. McAllister, F. H. Van Herk, C.L. Cockwill, N J Guselle, Jim J. Miller, Francis J. Larney, Merle E. Olson |
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| Rok vydání: | 2004 |
| Předmět: | |
| Zdroj: | Compost Science & Utilization. 12:235-241 |
| ISSN: | 2326-2397 1065-657X |
| Popis: | Effects of composting manure on viability of Giardia cysts (GC) and Cryptosporidium cysts (CO) were determined in a two-year study with manure from feedlot cattle bedded on barley straw or woodchips. Each year, manure was deposited in 8 m × 2.5 m × 2 m windrows (one per bedding type) on a sheltered concrete pad. On day 0, porous bags containing 100 g of feces from confirmed Giardia- and Cryptosporidium-positive cattle (9 bags per retrieval day in Year 1; 3 per day in Year 2) were implanted in the windrows. Replicate bags were placed on the concrete pads as uncomposted controls. Windrow temperature and water content were measured and compost was turned mechanically twice each week. Fecal bags were retrieved and subsampled for enumerations of total and viable cysts and cysts after 1, 2, 3, 7, 10, 17, 24 and 31 days in 1998 and after 1, 2, 3, 7, 9, 16, 23, 30, 42, 56, 70 and 98 days in 1999. Windrow temperatures (TEMP) exceeded 55°C during the fourth week of composting, and remained above 50°C for 4 wk there... |
| Databáze: | OpenAIRE |
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