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

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... Full description

Journal Title: Poultry Science 2012, Vol. 91(6), pp.1371-1378
Main Author: Walk, C. L
Other Authors: Bedford, M. R , Mcelroy, A. P
Format: Electronic Article Electronic Article
Language:
Subjects:
ID: ISSN: 0032-5791 ; E-ISSN: 1525-3171 ; DOI: 10.3382/ps.2011-01928
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recordid: oxford10.3382/ps.2011-01928
title: Influence of limestone and phytase on broiler performance, gastrointestinal pH, and apparent ileal nutrient digestibility
format: Article
creator:
  • Walk, C. L
  • Bedford, M. R
  • Mcelroy, A. P
subjects:
  • Broiler
  • Calcium
  • Phosphorus
  • Phytase
ispartof: Poultry Science, 2012, Vol. 91(6), pp.1371-1378
description: 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 < 0.05) in broilers fed 1.03% Ca compared with broilers fed 0.64% Ca (0.67 vs. 0.53, respectively). Phytase improved AID of CP in broilers fed 1.0% Ca but did not have an effect on AID of CP in broilers fed 0.64% Ca, which resulted in a Ca × phytase interaction ( P < 0.05). In conclusion, high dietary Ca increased pH in gizzard and ileum and interfered with the AID of P and CP. The interactions between Ca and phytase in the gastrointestinal tract are complex, and feeding phytase at doses above industry recommendations may allow for reduced-Ca diets while maintaining broiler performance, bone ash, and improving amino acid digestibility.
language:
source:
identifier: ISSN: 0032-5791 ; E-ISSN: 1525-3171 ; DOI: 10.3382/ps.2011-01928
fulltext: fulltext
issn:
  • 0032-5791
  • 00325791
  • 1525-3171
  • 15253171
url: Link


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