title: The effect of phytase and fructooligosaccharide supplementation on growth performance, bone quality, and phosphorus utilization in broiler chickens.
abstract: An experiment was conducted to investigate the effects of phytase and 2 levels of fructooligosaccharide (FOS) supplementation on growth performance, bone mineralization, and P utilization of broiler chickens. A total of 210 day-old male broiler chickens (Ross) were randomly placed into 7 dietary treatments consisting of 6 replicates with 5 birds per pen. The experiment was designed as an augmented 2 × 3 factorial arrangement with 0 or 500 U/kg of phytase and 0, 0.5% or 1% of FOS added to a reduced Ca (0.8%) and available P (0.25%) negative control diet (NC). A positive control diet (PC) that contained 1% Ca and 0.45% available P was also included. During the entire experimental period, phytase supplementation significantly improved (P < 0.05) the feed conversion ratio (FCR), BW gain (BWG), and feed intake. Birds fed the PC diet showed significantly higher bone mineral density (BMD) and bone mineral content (BMC) in both femur and tibia bones (P < 0.0001) than those fed the NC diet. Phytase supplementation increased femur BMD (P < 0.05), whereas FOS decreased femur BMD and BMC (P < 0.05). Phosphorus utilization was significantly higher for the NC diet (P < 0.0001). Phytase alone and in combination with 0.5% FOS increased P utilization significantly when compared with other treatments (P < 0.05). Fructooligosaccharides, especially at the level of 0.5%, increased P retention. In conclusion, phytase supplementation in low Ca and P diets improved growth performance, bone quality, and P utilization. However, supplementing NC diets with phytase and FOS did not result in bone mineralization values comparable with that of the PC diet. The application of dietary FOS alone had a negative effect on broiler bone quality.
authors.affiliation: Department of Animal Science, University of Manitoba, Winnipeg R3T 2N2, Canada.
authors.forename: Y
authors.initials: Y
authors.lastname: Shang
authors.affiliation: Department of Animal Science, University of Manitoba, Winnipeg R3T 2N2, Canada.
authors.forename: A
authors.initials: A
authors.lastname: Rogiewicz
authors.affiliation: Canadian Bio-Systems Inc., Calgary, Alberta T2C 0J7.
authors.forename: R
authors.initials: R
authors.lastname: Patterson
authors.affiliation: Department of Animal Science, University of Manitoba, Winnipeg R3T 2N2, Canada.
authors.forename: B A
authors.initials: BA
authors.lastname: Slominski
authors.affiliation: Department of Poultry Science, University of Georgia, Athens 30602-2772 wkkim@uga.edu.
authors.forename: W K
authors.initials: WK
authors.lastname: Kim
mesh_terms: D010832:6-Phytase / Q000008:administration & dosage / Q000494:pharmacology*; D000821:Animal Feed / Q000032:analysis; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D015519:Bone Density / Q000187:drug effects*; D002645:Chickens / Q000254:growth & development* / Q000378:metabolism*; D004032:Diet / Q000662:veterinary; D019587:Dietary Supplements; D004359:Drug Therapy, Combination; D008297:Male; D009844:Oligosaccharides / Q000008:administration & dosage / Q000494:pharmacology*; D010758:Phosphorus / Q000378:metabolism*
chemical_list: D009844:Oligosaccharides; C116580:fructooligosaccharide; D010758:Phosphorus; D010832:6-Phytase
keywords: bone quality; broiler chicken; fructooligosaccharide; phosphorus utilization; phytase