But when the cow's diet was switched to hay, the bacteria became acid-sensitive, so they would die if eaten by a person. Antibiotic additives are recommended, particularly for creep, starter and growing rations. Research indicates a response to antibiotics through the entire feeding. Lower levels can be used in finishing rations to reduce cost. Research on antibiotic value in sow rations has not been conclusive.
Antibiotics are particularly effective when sanitation is below normal and stress is above normal.
This research was mainly focussed to develop comprehensive feeding strategies to minimize nutrient excretion and odours in swine manure. Lea White, Animal Science, North Carolina State University - M.Sc.