Phosphorus requirements of broiler chicks three to six weeks of age as influenced by phytase supplementation

Two studies of identical design were conducted in battery brooders utilizing male chicks of a commercial strain. The birds were grown to 3 wk on diets with adequate P and from 3 to 6 wk were fed diets ranging from 0.10 to 0.45% nonphytate P (nPP) in increments of 0.05%, with or without supplementati...

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Bibliographic Details
Published in:Poultry science 2001-04, Vol.80 (4), p.455-459
Main Authors: Yan, F, Kersey, J H, Waldroup, P W
Format: Article
Language:English
Subjects:
6-Phytase - administration & dosage
Animal Nutritional Physiological Phenomena
Animals
Body Weight
Chickens - growth & development
Dietary Supplements
Feces - chemistry
Male
Nutritional Requirements
Phosphorus - analysis
Phosphorus, Dietary - administration & dosage
Tibia - chemistry
Weight Gain
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Summary:Two studies of identical design were conducted in battery brooders utilizing male chicks of a commercial strain. The birds were grown to 3 wk on diets with adequate P and from 3 to 6 wk were fed diets ranging from 0.10 to 0.45% nonphytate P (nPP) in increments of 0.05%, with or without supplementation with 800 units of phytase per kilogram of diet. Measurements included BW gain, feed conversion ratio (FCR), mortality, tibia ash, and fecal P content. Nonlinear regression was used to estimate nPP needs for optimizing BW gain, feed conversion, and tibia ash. In the absence of phytase, nPP levels of 0.33, 0.186, and 0.163% were required to optimize tibia ash, BW gain, and FCR, respectively. The estimated level for optimum tibia ash is in close agreement with current NRC (1994) recommendations. In the presence of 800 units of phytase per kilogram, nPP levels of 0.24, 0.151, and 0.109% were needed to optimize tibia ash, BW gain, and FCR, respectively. Fecal phosphorus levels were markedly reduced at the lower P levels. Further studies are needed to determine whether maximum tibia ash values are needed to sustain optimum production of market broilers.
ISSN:0032-5791
DOI:10.1093/ps/80.4.455