A rapid expansion of swine production in prairie provinces increased the public awareness of the
possible environmental risks of swine manure. The odours and water quality deterioration being
the main concerns, and an excess nitrogen (N) and phosphorus (P) excreted in manure are
responsible for adverse effect on water quality. Some of the large swine production units do not
have sufficient land base for an effective utilization of manure as fertilizer resulting in manure
storage and disposal problems. The new provincial environmental regulations require nutrient
management plans from the farms when the swine production exceeds certain number of animal
units. Some feeding strategies were developed for an amendment of the N and P content of
swine manure to minimize the adverse effects on environment.