Performance of Finishing Pigs as Affected by Prior Performance and the Addition of an Antibiotic during the Finishing Period

In a study reported last year (SWINE 84-12), we reported that pigs which had grown slowly from 50 to 115 lb continued to grow slower to market weight than their medium or fast growing counterparts. It was also found that the addition of a growth promoting level of an antibiotic failed to increase performance of the slow growing pigs. The study reported herein is a repeat of the previous study to verify the results