Growth performance, carcass quality, fresh belly characteristics, and commercial bacon slicing yields of growing-finishing pigs fed a subtherapeutic dose of an antibiotic, a natural antimicrobial, or not fed an antibiotic or antimicrobial

Abstract The objective was to compare growth performance, belly characteristics, and bacon slicing yields of growing-finishing pigs fed a subtherapeutic dose of an antibiotic, a natural antimicrobial, or a diet containing no antibiotics or antimicrobials. Barrows and gilts (96 each, initial BW: 27.52 ± 3.98 kg) were housed in 48 pens (8 replications per treatment) in a 2 × 3 factorial randomized complete block design. Pens were assigned 1 of 3 diets: antibiotic free, oregano or tylosin phosphate. Pigs were slaughtered at an average BW of 127.31 ± 10.18 kg. There were no differences among dietary treatments for growth performance ( P ≥  0.06), carcass cutability ( P  ≥ 0.42), loin quality ( P  ≥ 0.28), fresh belly dimensional characteristics ( P  ≥ 0.11), IV ( P  ≥ 0.87) or bacon processing characteristics ( P ≥  0.07). Given the lack of differences in meat quality from pigs fed diets without antibiotics, the implementation of VFD in the United States should not result in changes in pork quality.