ORIGINAL PAPER
The bioavailability of zinc from inorganic and
organic sources in broiler chickens as affected by
addition of phytase
1,
1,
2
| 1 | Department of Animal Nutrition, Research Institute of Animal Production,
32-083 Balice, Poland |
| 2 | Hu Nan Institute of Animal and Veterinary Science,
ChangSha, HuNan Province, P.R. China |
Publication date: 2001-04-20
J. Anim. Feed Sci. 2001;10(2):317–328
KEYWORDS
ABSTRACT
The effect of adding phytase to the diet on the bioavailability of zinc from organic and inorganic
sources was studied in an experiment carried out on 560 broiler chickens aged from 4 to 28 days.
Phytase was either added (750 FTU/kg) or not to a low-Zn wheat-soyabean diet. Simultaneously,
gradient levels of zinc (0, 10, 20 or 40 mg kg-1) from fodder ZnSO4∙H2O or an organic complex of Zn (Zn chelated with amino acids, ZnAA) were added to the diets without and with phytase.
The bioavailability of zinc from ZnAA, calculated using multiple linear regression, was generally higher than from ZnSO4, especially when the diet was not supplemented with phytase. The relative
bioavailability of Zn from ZnAA (Zn from ZnSO4 - 100%) in phytase-supplemented diets was: 103
(for body weight gain), 104 (for feed conversion), 114 (for Zn content in dried tibiae bones), 114 (for
Zn content in tibiae ash), and 109% (for total amount of Zn in tibiae bone). In the diets that were not
phytase-supplemented, the corresponding values were: 121, 116, 139, 142 and 117%, respectively.
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