Phosphorus utilization response of pigs and broiler chickens to diets supplemented with antimicrobials and phytase

作     者：Katherine McCormick Carrie L.Walk Craig L.Wyatt Olayiwola Adeola 

作者机构：Department of Animal Sciences Purdue University JBS United AB Vista Feed Ingredients 

出 版 物：《Animal Nutrition》 (动物营养（英文版）)

年 卷 期：2017年第3卷第1期

页      面：77-84页

核心收录：

学科分类：090502[农学-动物营养与饲料科学] 0905[农学-畜牧学] 09[农学] 

主　　题：Antimicrobials Chickens Phosphorus Phytase Pigs 

摘      要：Three experiments were conducted to evaluate the phosphorus(P) utilization responses of pigs and broiler chickens to dietary supplementation with antimicrobials and phytase and to determine if P digestibility response to phytase is affected by supplementation with antimicrobials. Experiment 1 used 4 diets(a basal negative control formulated to contain 0.41% total P and 0.71% calcium [Ca] without added antimicrobials, basal negative control with added carbadox, basal negative control with added tylosin, or basal negative control with added virginiamycin) and six 18-kg barrows in individual metabolism crates per diet. There was no effect of antimicrobials on P and Ca digestibility or retention. Carbadox supplementation increased(P 0.05) digestibility and retention of gross energy(GE) and supplementation with tylosin increased(P 0.05) N retention relative to the basal negative control diet. Experiment 2 used eight 19-kg barrows in individual metabolism crates per treatment and 9 dietary treatments arranged in a 3×3 factorial of antimicrobials(none, tylosin, or virginiamycin) and phytase(0, 500, or 1,500 FTU/kg).Phytase addition to the diets linearly increased(P 0.05) apparent total tract digestibility or retention of P, Ca, nitrogen(N) and GE. Supplementation with antimicrobials did not affect apparent total tract digestibility or retention of P, Ca, N or GE. There were linear effects(P 0.01) of phytase on Ca utilization in diets that were not supplemented with antimicrobials but only tendencies(P 0,10) in diets supplemented with tylosin or virginiamycin. Phytase linearly improved(P 0.05) N utilization in diets supplemented with tylosin or virginiamycin but not in diets without added antimicrobials. Experiment 3 was a broiler chicken experiment with the same experimental design as Exp. 2 but feeding 8 birds per cage and 10 replicate cages per diet. Antimicrobial supplementation improved(P 0.05) feed efficiency and adding tylosin improved(P 0.05) tibia as