The Efficacy of Organic Zinc Amino Acid Complex (AvailaZn®) On Growth Performance and Immunity of Pangasius Catfish (Pangasianodon hypophthalmus)
The efficacy of zinc amino acid complex (ZnAA; AvailaZn®) on growth performance and immunity of Pangasius catfish (Pangasianodon hypophthalmus) was assigned in CRD with 4 treatments and 5 replications per treatment. The treatments were control with supplemental inorganic zinc sulfate (ZnSO4;100 ppm Zn; T1), two treatments of 100 ppm zinc at different proportions of ZnSO4:ZnAA 70:30 (T2) and 40:60 (T3) and a treatment of only ZnAA at 50 ppm Zn (T4; 50% of control). Pangasius catfish with average weight of 209 g were stocked in 1,000 L fiber tanks at the density of 15 fish per tank and fed treatment diets 3% of body weight twice daily for three months. The results indicated that there were improved (P<0.05) growth performance in terms of body weight gain, average daily gain and specific growth rate of Pangasius catfish fed supplemental ZnAA at different levels compared to fish fed supplemental ZnSO4 (T1). The specific growth rates were 0.89, 1.20, 1.16 and 1.27 % in T1, T2, T3 and T4, respectively. Feed conversion ratio were not significantly different (P=0.08). Protein efficiency ratio in group of fish fed ZnAA(T2,T3,T4) were significantly better (P<0.05) than inorganicZnSO4(T1).White blood cell count, serum protein, immunoglobulin (IgM), hemoglobin, and super oxide anion in fish fed supplemental ZnAA were better (P<0.05) than fish fed inorganic ZnSO4 (T1). Therefore, using zinc amino acid complex (AvailaZn®) in Pangasius catfish diets can enhance catfish growth performance (P<0.05) and supplemental zinc amino acid complex (AvailaZn®) level in the catfish diet may be decreased by up to 50% of supplemental inorganic zinc levels. In conclusively, supplementation zinc amino acid complex (AvailaZn®) in Pangasius catfish diet is recommended at the level of 50 ppm for ZnAA as the sole supplemental Zn source or 100 ppm Zn in 70:30 proportion of ZnSO4:ZnAA.