Lean hog futures also fell on demand concerns even as producers are expected to turn out a steadily climbing number of slaughter-ready hogs in coming weeks.
CME October hog contracts fell 0.7 cent, or 0.8% to 86.4 cents a pound. December hogs fell 0.9 cent, or 1.1%, to 83.67 cents a pound.
Prices fell in part because the hurricane aftermath could temper demand for pork even as supplies of animals are expected to keep rising through October. Hog producers are said to have little flexibility to hold onto animals they need to sell because a backlog could disrupt production routines, which means a crowd of motivated sellers could push down cash prices.
Cash hog prices were reported weak to as much as $2 per hundred pounds lower on slow buying interest and sufficient supplies.
Many of the pork processing plants have enough hogs booked through midweek or later and some only need a few more loads to complete this week's slaughter schedules.
The terminal markets traded steady to $2 lower on a live basis with top prices from $62 to $68 per hundredweight.
The USDA's pork carcass composite value, a measure of wholesale prices, on Friday was down 32 cents at $101.79 a hundred pounds.