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Asian-Australas J Anim Sci > Volume 30(7); 2017 > Article
Asian-Australasian Journal of Animal Sciences 2017;30(7): 1006-1012. doi: https://doi.org/10.5713/ajas.16.0551
Effects of zinc bearing palygorskite supplementation on the growth performance, hepatic mineral content, and antioxidant status of broilers at early age
Weili Yang1, Yueping Chen1, Yefei Cheng1, Chao Wen1, Yanmin Zhou1,*
1College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
* Corresponding Author: Yanmin Zhou ,Tel: +86-25-84396067, Fax: +86-25-84395314, Email: zhouym6308@163.com
Received: July 20, 2016;  Revised: October 26, 2016.  Accepted: December 17, 2016.  Published online January 2, 2017.

ABSTRACT
Objective:
This study was conducted to investigate effects of zinc (Zn) bearing palygorskite (ZnPal) supplementation on growth performance, hepatic mineral content, and antioxidant status of broilers at early age.
Method:
A total of 240 1-day-old Arbor Acres broiler chicks were allocated into 5 treatments with 6 replicates of 8 chicks each. Birds in 5 treatments were fed a basal diet supplemented with 0 (Control group; Analyzed Zn content: 81 mg/kg), 20, 40, 60, and 80 mg/kg Zn as ZnPal for 21 days, respectively. Blood, liver and intestinal mucosa were collected at 21 days of age.
Results:
Treatments did not affect growth performance of broilers during the 21-day study (p> 0.05). The contents of hepatic Zn and magnesium (Mg) were linearly increased (p<0.001) by ZnPal supplementation. ZnPal inclusion linearly (p = 0.007) reduced malondialdehyde (MDA) concentration in serum. The activity of total superoxide dismutase (T-SOD) in liver increased linearly (p = 0.001) with concentration of ZnPal in diet. ZnPal inclusion linearly (p = 0.036) and quadratically (p = 0.005) increased T-SOD activity, and linearly (p = 0.012) increased copper/zinc superoxide dismutase (Cu/Zn SOD) activity in jejunal mucosa. The maximum responses of hepatic and jejunal antioxidant enzymes activities (T-SOD and Cu/Zn SOD) were found when supplementing the basal diet with 60 mg/kg Zn as ZnPal. Furthermore, ZnPal supplementation quadratically (p = 0.001) increased Cu/Zn SOD activity in ileal mucosa, and its maximum activity was observed in the diet supplemented with 20 mg/kg Zn as ZnPal.
Conclusion:
ZnPal supplementation did not alter growth performance of broilers. Dietary ZnPal inclusion could increase concentrations of hepatic trace minerals (Zn and Mg) and inhibit lipid peroxidation by reducing serum MDA accumulation, with the optimal dosage of Zn from ZnPal being 80 mg/kg diet (analyzed Zn content in the diet: 165 mg/kg), and 60 mg/kg Zn as ZnPal (analyzed Zn content in the diet: 148 mg/kg) was the optimum dosage for broilers to achieve maximum antioxidant enzyme activities.
Keywords: Zinc Bearing Palygorskite; Mineral Element; Superoxide Dismutase; Malondialdehyde; Broilers
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