Hog factories have nurseries, sow farms, and adult
hog houses. Hog houses are the huge barns where hogs
spend their entire adult lives. Hog houses can be
as big as football fields, and can hold 800 to 1,000
pigs packed together. Every single hog in the hog
house dumps over 10 pounds of urine and feces per
day, or almost 2 tons per hog per year. This hog waste
falls through steel grates underneath the hogs' cages
and sits on a concrete slab underneath the hog house.
Here, odor and nitrogen ammonia are carried by wind
to nearby land, water, and noses.
Adult Hog House