Impact of antimicrobials with or without the addition of phytase on phosphorus digestibility and utilization in swine and broiler chickens

TL;DRAbstract

Three studies were conducted for this thesis. In study 1, effects of antimicrobials on nutrient digestibility and retention of 18 to 20-kg pigs was investigated. The study used a randomized complete block design (RCBD) with 4 treatments and 6 replicate pigs in individual metabolism crates per treatment. The four treatments consisted of, negative control (NC) devoid of antimicrobials with 0.41% total P and 0.71% Ca, NC with 55 mg/kg carbadox (Mecadox 10, Phibro Animal Health), 44 mg/kg tylosin (Tylan 40, Elanco Animal Health), and 11 mg/kg virginiamycin (Stafac 20, Phibro Animal Health). A 5-d total collection period with chromic oxide used as an initiation and termination marker for feces followed a 5-d adaptation period. Supplementation with carbadox increased (P < 0.05) energy (E) digestibility and retention relative to pigs fed the NC diet. Overall, supplementation of an antimicrobial did not significantly influence DM, P, and Ca utilization; however, specific antimicrobial suppleme

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