Abstract
ABSTRACT MACHINE productivity, energy consumption and cost of feedlot manure collection were determined by time-motion analysis at four Texas cattle feedlots. Truck loading, hauling, and spreading time require-ments were also determined, as was the performance of wheel loader operators. The wheel loader/chisel plow combination produced the highest manure col-lection rate of 160 t (metric tons)/h (at 100 percent operating efficiency), followed in order by the ele-vating scraper, wheel loader, and wheel loader/roto-tiller. The most energy efficient collection system was the elevating scraper (0.88 kWh/t). Plowing of the manure pack before the wheel loader collection reduced overall energy consumption by 30 percent and increased the collection rate by 46 percent. The average rate of manure loading into spreader trucks was 186 t/h or 3.0 min per truck. Performance of wheel loader oper-ators varied by 85 percent. A prediction equation for spreader truck turn-around time versus haul distance was developed.
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