With revenues amounting to over three billion Canadian dollars (see Table 3), the pork sector accounts for 30% of total livestock shipments and for 10% of all farm cash receipts. Hog production is a vital component of Canada’s agricultural economy. Each province shares in this production in quality and in volume (see Table 1). Canada is favoured with adequate grain production allowing for selective, controlled feeding and with reasonable feed costs. Virtually all commercial hog production in Canada takes place in a controlled environment which implies that, at all times of the year, animals are kept in buildings specialized to the farrowing, growing and finishing stages of raising market hogs. The most common hog production unit today is a specialized farrow-to-finish operation of 200 to 250 sows, which can be managed efficiently by a single family.