Influence of limestone and phytase on broiler performance, gastrointestinal pH, and apparent ileal nutrient digestibility

Poultry Science
C L WalkAudrey McElroy

Abstract

An experiment was conducted to determine the influence of 2 levels of dietary Ca from limestone and 3 levels of phytase on broiler performance, bone ash, gastrointestinal pH, and apparent ileal digestibility (AID) of Ca, P, and amino acids. Cobb 500 broilers (n = 576) were allowed access to one of 6 corn-soy diets from 0 to 16 d. Experimental diets contained 1.03% or 0.64% Ca from limestone and 0.61% total P. Each diet was supplemented with 0, 500, or 5,000 FTU/kg of phytase to create a 2 × 3 factorial experiment. Broiler feed intake (FI) and BW gain were not affected by dietary Ca or phytase. Feed conversion ratio was improved (P < 0.05) as dietary phytase increased (1.36, 1.34, and 1.31, respectively). Tibia ash percent was reduced (P < 0.05) from 41.4 to 40.0% as dietary Ca decreased but increased with phytase addition (P < 0.05). Gizzard and ileal pH were reduced (P < 0.05) in broilers fed 0.64% Ca compared with broilers fed 1.03% Ca. Phytase at 5,000 FTU/kg increased (P < 0.05) pH in the gizzard, duodenum, jejunum, and ileum. Apparent ileal P digestibility was increased (P < 0.05) in broilers fed 0.64% Ca compared with broilers fed 1.03% Ca (0.68 vs. 0.73, respectively). Apparent ileal Ca digestibility was increased (P < 0...Continue Reading

Citations

Feb 12, 2014·Animal : an International Journal of Animal Bioscience·N K MorganE J Burton
Aug 19, 2014·Journal of Animal Physiology and Animal Nutrition·B Singh, T Satyanarayana
Nov 19, 2014·Journal of Animal Physiology and Animal Nutrition·E HumerK Schedle
Feb 13, 2018·British Poultry Science·S A LeeM R Bedford
Jul 31, 2018·Asian-Australasian Journal of Animal Sciences·Henrique Barbosa de FreitasPatrícia Rodrigues Berno
Jan 17, 2020·Animals : an Open Access Journal From MDPI·Zuzanna WiśniewskaSebastian A Kaczmarek
Nov 5, 2020·Avian Pathology : Journal of the W.V.P.A·Tommy Van LimbergenRichard Ducatelle

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