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Phytate utilization and phosphorus excretion by broiler chickens fed diets containing cereal grains varying in phytate and phytase content

Leytem, A.B. and Willing, B.P. and Thacker, P.A. (2008) Phytate utilization and phosphorus excretion by broiler chickens fed diets containing cereal grains varying in phytate and phytase content. Animal Feed Science and Technology. 146:160-168.

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Abstract

Eighty, 12-day-old, male broiler chicks, were fed one of four diets to determine the effects of
feeding grains varying in phytate phosphorus (P) and intrinsic phytase activity on ileal and excreta
P digestibility and composition. The diets contained approximately 970.7 g grain kg?1 (maize, high
fat–low lignin oat, normal barley or low-phytate barley) with the cereal supplying the sole source of
dietary P. The diets were fed for a 7-day acclimation period followed by a 2 day excreta collection
while ileal digesta was collected at slaughter on day 21. The coefficients of ileal apparent digestibility
(CIAD) for P and phytate P ranged from 0.79 (normal barley) to 0.86 (maize and low-phytate barley)
and 0.76 (low-phytate barley) to 0.89 (maize), respectively. The CIAD for phytate P was significantly
greater in the maize and high fat–low lignin oat diets, while the low-phytate barley diet had the lowest
coefficient (P>0.002). The coefficients of total tract apparent digestibility (CTTAD) for P and phytate
P ranged from 0.25 (maize) to 0.35 (low-phytate barley) and 0.90 (maize and low-phytate barley) to
0.96 (high fat–low lignin oat), respectively, with no significant differences between diets. There was
very little phytate P in excreta regardless of the type of grain fed (<0.13 of total P) with no significant
differences between diets. Phytate P degradation was not related to the level of intrinsic phytase in
the diet. In summary, current results indicate that, regardless of the type of grain fed, dietary phytate
P is highly digestible when large amounts of calcium and P are not added into poultry diets and little
phytate P is excreted.

Item Type: Article
NWISRL Publication Number: 1300
Subjects: Soil
Animal
Soil > Chemistry
Depositing User: Users 6 not found.
Date Deposited: 30 Nov 2009 20:51
Last Modified: 17 Oct 2016 16:35
Item ID: 1323
URI: https://eprints.nwisrl.ars.usda.gov/id/eprint/1323