Effects of 1,25-dihydroxycholecalciferol and phytase on zinc utilization in broiler chicks

Studies were conducted with corn-soybean meal diets to evaluate the effects of phytate phosphorus utilization on zinc absorption and retention in broiler chicks. In the first two experiments, zinc-65 was used to determine zinc absorption. Experiment 1 was a 2 X 2 factorial with 0 or 5 microgram/kg d...

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Bibliographic Details
Published in:Poultry science 1994-08, Vol.73 (8), p.1312-1326
Main Authors: Roberson, K.D, Edwards, H.M. Jr
Format: Article
Language:English
Subjects:
6-Phytase - administration & dosage
ABSORCION
ABSORPTION
ACIDE PHYTIQUE
ACIDO FITICO
ACTIVIDAD ENZIMATICA
ACTIVITE ENZYMATIQUE
Animals
Body Weight - drug effects
Bone Density - drug effects
CALCIO
Calcitriol - administration & dosage
CALCIUM
Chickens - metabolism
CINC
ENFERMEDADES OSEAS
FITASA
Food, Fortified
FOSFATASA ALCALINA
FOSFORO
HUESOS DE LOS MIEMBROS
Incidence
Male
METABOLISME DES MINERAUX
METABOLISMO DE MINERALES
OS DES MEMBRES
Osteochondrodysplasias - epidemiology
Osteochondrodysplasias - veterinary
OSTEOPATHIE
PESO
PHOSPHATASE ALCALINE
PHOSPHORE
Phosphorus - metabolism
PHYTASE
POIDS
POLLITO
POLLO DE ENGORDE
POULET DE CHAIR
Poultry Diseases - epidemiology
POUSSIN
SERUM SANGUIN
SUERO SANGUINEO
Tibia
VITAMINA D
VITAMINE D
ZINC
Zinc - administration & dosage
Zinc - metabolism
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Summary:Studies were conducted with corn-soybean meal diets to evaluate the effects of phytate phosphorus utilization on zinc absorption and retention in broiler chicks. In the first two experiments, zinc-65 was used to determine zinc absorption. Experiment 1 was a 2 X 2 factorial with 0 or 5 microgram/kg dihydroxycholecalciferol and 0 or 40 ppm supplemental zinc. In Experiment 2, 5 microgram/kg 1,25-dihydroxycholecalciferol [1,25-(OH)2D3] or 750 units/kg phytase or both were added to a diet containing 35 ppm zinc. The diets in Experiment 3 were similar to Experiment 2 except that 600 units/kg phytase was fed. Experiment 4 was similar to Experiment 3 except that dietary phosphorus was decreased by 0.15%. There were no treatment effects on body weight in Experiments 1 and 2. Zinc absorption was higher in zinc-deficient birds in Experiment 1, but there were no other effects on zinc-65 absorption or retention. Body weight was increased by 1,25-(OH)2D3 in Experiments 3 and 4 and by phytase in Experiment 4. Phytate phosphorus retention was increased by phytase and 1,25-(OH)2D3 and was increased additively when both sources were fed. Dietary 1,25-(OH)2D3 increased zinc retention at times during Experiments 3 and 4, but this response was inconsistent. Phytase did not affect zinc retention. Phytase plus 1,25-(OH)2D3 increased zinc retention synergistically in Experiment 3. Bone zinc was increased by 1,25-(OH)2D3 and phytase, and there was an additive effect in Experiment 3. Plasma zinc and alkaline phosphatase were not affected. The results suggest that supplemental zinc may be decreased in a corn-soybean meal diet when phytate phosphorus utilization is enhanced
ISSN:0032-5791
1525-3171
DOI:10.3382/ps.0731312