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Fate of Coliform Bacteria in Composted Beef Cattle Feedlot Manure

Agriculture and Agri-Food Canada, Research Centre, 5403 1st Ave. S., Lethbridge, Alberta, Canada T1J 4B1

View larger version (29K): [in a new window]   Fig. 1. Effect of bedding type on total coliforms (mean across locations ± SE, n = 6) in (a) 1998 and (b) 1999. Bedding type (1998, 1999) and bedding x location interaction (1999) effects were nonsignificant on all sampling dates.

View larger version (31K): [in a new window]   Fig. 2. Effect of vertical windrow location on total coliforms (mean across bedding types ± SE, n = 4) in 1999. Bedding type and bedding x location interaction effects were nonsignificant on all sampling dates.

View larger version (27K): [in a new window]   Fig. 3. Effect of bedding type on E. coli (mean across locations ± SE, n = 6) in (a) 1998 and (b) 1999. Bedding type (1998, 1999) and bedding x location interaction (1999) effects were nonsignificant on all sampling dates.

View larger version (29K): [in a new window]   Fig. 4. Effect of vertical windrow location on E. coli (mean across bedding types ± SE, n = 4) in 1999. The symbol * indicates significance at the 0.05 probability level. Bedding x location interaction effect was nonsignificant on all sampling dates.

View larger version (43K): [in a new window]   Fig. 5. Effect of bedding type on total aerobic heterotroph populations incubated at 39°C (mean ± SE, n = 6) in (a) 1998 and (b) 1999. The symbols * and ** indicate bedding effect significance at the 0.05 and 0.01 probability levels, respectively.

View larger version (40K): [in a new window]   Fig. 6. Effect of year on windrow temperature (mean ± SE, n = 9) during composting of (a) straw-bedded and (b) wood chip–bedded manure.