Transport of most inputs and outputs takes place by some type of heavy vehicle: semi-truck; large-scale, tractor-drawn spreader; or possum-belly truck. However, the transport of labor and management to the production site normally occurs via some type of passenger vehicle. These different vehicles have differential impacts on the roadway congestion and roadway wear-and-tear. Therefore, Table 17 lists total trips broken down into total annual passenger-vehicle trips and total annual heavy-vehicle trips by manure system. In all cases featuring heavy vehicles, however, it is assumed that the largest feasible vehicle was used. In the case of manure, it is assumed that poultry manure is handled in semi-trucks while for non-poultry manures it is assumed that manure is handled in large, tractor-drawn spreaders.
The number of passenger-vehicle trip totals ranges from 240 (beef feedlot) to 5,472 (layer operation). Generally, solid-manure systems require more trips. On a per-animal-unit basis, dairy and hog-farrowing operations typically have the highest heavy-vehicle requirement while broilers and layers (calculated in the tables at 10,000 animal units vs. 1,000 animal units for other enterprises) have the smallest requirement.
| Table 17. Heavy Vehicle and Passenger Vehicle Trips Generated by New Animal Confinement Operations. | |||||
| Enterprise | Passenger Vehicle Trips |
Heavy Vehicle Trips by Manure System | |||
| Liquid Manure System A |
Liquid Manure System B |
Slurry Manure System |
Solid Manure System |
||
| Hog Finishing (1,000 AU) | 280 | 1,932 | 125 | 928 | 2,534 |
| Hog Farrowing (1,000 AU) | 2,000 | 4,531 | 301 | 2181 | 5,940 |
| Hog Farrow-to-Finish (1,000 AU) | 425 | 1,928 | 100 | 913 | 2,537 |
| Steer Feedlot (1,000 AU) | 240 | 2,238 | 345 | 1,186 | 2,869 |
| Dairy (1,000 AU) | 2,643 | 3,861 | 890 | 2,211 | 4,851 |
| Broiler (10,000 AU) | 730 | NA* | NA* | NA* | 3,340 |
| Layer (10,000 AU) | 5,472 | NA* | NA* | NA* | 3,052 |
| * Because of the low liquid content of poultry manure, it is assumed the manure is handled only by solid-manure handling systems and only in semi-trucks; non-poultry livestock manure is assumed to move in large spreaders. | |||||
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