Ileal amino acid and phosphorus digestibility responses of pigs to microbial phytase supplementation of high-phytin diets

J. S. Sands, R. N. Dilger, D. Ragland, O. Adeola

Research output: Contribution to journalArticlepeer-review

Abstract

The hypothesis that increase in dietary phytin amplifies phytin binding to protein thereby reducing protein digestion, which is alleviated by phytase, was tested. A 2 × 2 factorial arrangement of dietary treatments was used to investigate the response of growing pigs to supplemental phytase (0, or 1200 units/kg) in low- or high-phytin P diets (2.2 or 3.9 g/kg). Eight crossbred barrows (28-30 kg) were canulated and assigned to crates using a double, 4 × 4 Latin Square design. Pigs were fed each of the 4 diets at 3 times metabolic BW (0.09 * BW kg 0.75) for 7 d. Ileal digesta was collected for 12 h on d 6 and d 7 by attaching plastic bags to the cannula. Feed and ileal digesta were analyzed for N, energy and P. Phytase had no effect on apparent ileal digestibility (AID) of N or AAs. The AID of some AAs was higher in the high-phytin diet, which contradicts the hypothesis that higher phytin content would have a negative impact. In contrast, the AID of P was depressed by high dietary phytin (P < 0.01) and increased by phytase (P < 0.01) more so at the higher dietary phytin resulting in a phytin × phytase interaction (P < 0.01).

Original languageEnglish (US)
Pages (from-to)208-211
Number of pages4
JournalLivestock Science
Volume109
Issue number1-3
DOIs
StatePublished - May 15 2007
Externally publishedYes

Keywords

  • Amino acid utilization
  • Phosphorus
  • Phytase
  • Pigs

ASJC Scopus subject areas

  • Animal Science and Zoology
  • General Veterinary

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