Post-weaning lag in nursery pigs is still a problem in the swine industry. It
causes detrimental effects in the nursery pig. The abrupt change in diet, sow
milk to dry feed, produces a decrease in gastrointestinal enzyme activity,
intestinal damage to the villi, low voluntary intake, and many more negative
impacts on the newly-weaned pig. When subtherapeutic antibiotics are
supplemented to a high nutrient dense diet, post-weaning lag is reduced.
Subtherapeutic antibiotics improve growth performance, and decrease mortality
and diarrhea in nursery pigs. However, there is a growing concern of antibiotic