The need for differences in immune levels

Pig producers world-wide seem to me to be hazy about the need to recognise differences in immune levels for breeding stock and grower/finisher pigs. Pig producers world-wide seem to me to be hazy about the need to recognise differences in immune levels for breeding stock and grower/finisher pigs. First point Failure to establish the desired height of the protective immune barrier, which with correct farm management and planning is different for both categories, costs farmers a good deal of