Further Evaluation of the Available Phosphorus Requirement of Laying Hens and Methods for Improving the Availability of Phosphorus in Feedstuffs for Poultry

Snow, Janet Lynn

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Description

Title

Further Evaluation of the Available Phosphorus Requirement of Laying Hens and Methods for Improving the Availability of Phosphorus in Feedstuffs for Poultry

Author(s)

Snow, Janet Lynn

Issue Date

2002

Doctoral Committee Chair(s)

Parsons, Carl M.

Department of Study

Animal Sciences

Discipline

Animal Sciences

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

Ph.D.

Degree Level

Dissertation

Keyword(s)

Agriculture, Animal Culture and Nutrition

Language

eng

Abstract

A final laying hen experiment was conducted to evaluate the efficacy of phytase for increasing amino acid utilization of three different laying hen diets. The results indicated that 300 units phytase/kg did not improve amino acid digestibility in laying hen diets containing corn, soybean meal, meat and bone meal and wheat middlings. Chicks were utilized to evaluate the effects of combinations of citric acid (3--4%), phytase (300 units/kg), and 1alpha-hydroxycholecalciferol (5--15 mug/kg) on phytate P utilization in corn-soybean meal P-deficient diets. All compounds improved phytate-P utilization and the effects were generally additive, with some possible synergism between citric acid and 1alpha-hydroxycholecalciferol. Bioavailable P release for citric acid, phytase and 1alpha-hydroxycholecalciferol was calculated to be 0.03, 0.02, and 0.04% P, respectively, and 0.12% P for the combination of all three compounds.

Graduation Semester

2002

Type of Resource

text

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