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

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.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Animal Sciences

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2015

Author dc:creator

• Snow, Janet Lynn

Contributors dc:contributor

• Parsons, Carl M.

• Agriculture, Animal Culture and Nutrition

Language dc:language

eng

Identifier

(MiAaPQ)AAI3070052

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/83545