Abstract
An experiment was conducted with 312 day-old male broiler chicks in grower phase(8-28d) to estimate the biological availability of four sources Zinc (Zn), Zinc sulfate(ZnSO4.H2O), two sources of Zinc oxide(ZnO FG1 and ZnO FG2) and Bioplex Zn. Zinc sulfate (ZnSO4.H2O) was used as the standard in the bioavailability assay. Chicks were allotted randomly to 13 dietary treatments with 6 birds per replicate and 4 replicates per treatment, that included an unsupplemented corn-soybean meal basal diet (25.50 mg of Zn/kg of DM), or the basal diet supplemented with 100, 150 or 200 mg/kg of DM as either ZnSO4.H2O (33 % Zn), Zinc oxide FG1(72%Zn), Zinc oxide FG2 (75%Zn) or Bioplex Zn (15% Zn). Dietary Zn level and source had no effect (P>0.05) of feed intake or body weight gain of chicks during first and second weeks of experimental periods, but feed conversion ratio in the first and second week and feed intake, body weight gain or feed conversion ratio in third week and total experimental periods were significant difference between treatments (P<0.05). The relative biological availability values using body weight gain were estimated to be 59, 99 or 45 for three levels of Zinc oxide FG1, 64, 78 or 31 for three levels of Zinc oxide FG2 and 151, 200 or 147 for three levels of Bioplex Zn, respectively. From the standpoint of bioavailability, Bioplex Zn was more available to broiler chicks than Zn from other sources and can be used by the feed industry as sources of supplemental Zn for broiler chickens.
Highlights
Zinc is an essential trace element that is required for growth, bone development, feathering, enzyme structure and function, and appetite for all avian species, Zinc is commonly added as a supplement to all formulated poultry diets.Because many natural feed ingredients are marginally deficient in Zn (Falchuk and Vallee, 1985; Kaim and Schwederski, 1994)
In the first week of trials, the best FCR was observed in the 100 ppm levels of Bioplex Zn, 200 ppm levels of Zn oxide FG1 and 150 ppm levels of Zinc sulfate
All of zinc sources in different levels had significant effects on FCR, but the lowest FCR was observed in 150 ppm levels of Bioplex Zn in diet
Summary
Zinc is an essential trace element that is required for growth, bone development, feathering, enzyme structure and function, and appetite for all avian species, Zinc is commonly added as a supplement to all formulated poultry diets. Wedekind and Baker (1990) reported relative bioavailability (RBV) values for chicks fed feed-grade (FG) Waelz-processed ZnO of 61% (weight gain) and 44% (total tibia Zn) compared with FG ZnSO4.H2O (100%). Using weight gain as a response variable, Edwards (1959) reported that Zn from analytical grade and technical grade ZnO as well as Zn metal powder was 100% bioavailable for young chicks relative to analytical grade ZnSO4.7H2O. Attention because of The data reported by Wedekind et al (1992) indicated that, for chicks fed corn-soybean meal diets, Zn from a Zn methionine complex was 206% bioavailable relative to a ZnSO4.H2O standard (i.e. 100%), where ZnO provided only 61% bioavailable Zn. There are conflicting data reported regarding the relative efficacy of different organic versus inorganic Zn sources in enhancing broiler performance. The research presented aimed to compare bio-efficacy of various inorganic and organic Zn compounds in the light of their effects on the performance of broiler chicks fed corn-soybean meal diets
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