The effects of dietary Zinc on growth, immunity and reproductive performance of female Macrobrachium nipponense prawn
2021
Zhang, Meng | Huang, Youhui | Li, Yiming | Cai, Mingqi | Zhao, Yunlong
We accessed the effects of dietary Zn on growth, immunity and reproductive performance in female Macrobrachium nipponense. After feeding with a homemade diet containing 21, 50, 81, 136 and 203 mg kg⁻¹ Zn for 60 days, prawns showed a significant increase in weight gain, improved survival, higher hepatosomatic and gonadosomatic indices (p < 0.05) in group 50 and 81 mg kg⁻¹ Zn. Broken‐line analysis indicated that the optimal concentration of dietary zinc was 75.48 mg kg⁻¹. Dietary Zn had drastically increased crude lipid content in body composition (p < 0.05), while moisture, ash and crude protein had no significant difference among groups (p > 0.05). Zn content in hepatopancreas linearly increased along with increases in dietary Zn, while Zn content in muscle and haemolymph had no difference in Zn supplemented groups (p > 0.05). The highest activities of Cu/Zn‐SOD, T‐SOD and CAT in hepatopancreas were in 81 mg kg⁻¹ and 50 mg kg⁻¹ Zn diet, respectively. MDA had the lowest content in 21 to 81 mg kg⁻¹ Zn levels. The highest haemolymph AKP activity was in 81 mg kg⁻¹ Zn diet group, while the highest PO activity was in 136 mg kg⁻¹ Zn diet. Both levels of progesterone and estradiol and gene expression of VG and VGR were highest in 50 to 81 mg kg⁻¹ Zn levels. These results provided evidence that dietary Zn ranging from 50 to 81 mg kg⁻¹ has a positive impact on growth, immunity and reproductive performance of female prawn.
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