RESEARCH PAPER

Effects of Different Forms of Zinc Oxide on Growth Performance, Serum Biochemical Indexes and Antioxidant Capacity of Meat Rabbits

  • CAI Jingyi ,
  • WU Shuang ,
  • KUANG Yinggu ,
  • LIU Guangmang ,
  • ZHAO Hua ,
  • JIA Gang ,
  • TIAN Gang
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  • 1. Key Laboratory for Animal Disease-Resistance Nutrition of Ministry of Education, Animal Nutrition Institute, Sichuan Agricultural University, Chengdu 611130, China;
    2. Animal Disease-Resistance Nutrition, Key Laboratory of Sichuan Province, Chengdu 611130, China;
    3. Fujiang Syno Biotech Co., Ltd., Fuzhou 350700, China

Received date: 2022-05-11

  Online published: 2022-11-14

Abstract

The aim of this study is to investigate the effects of different forms of zinc oxide on growth performance, serum biochemical indexes and antioxidant capacity of meat rabbits. A total of 162 healthy New Zealand white rabbits[(689.74±34.58) g] aged 35 days were randomly divided into three groups with 27 replicates in each group and 2 rabbits in each replicate. Rabbits were fed a basal diet supplemented with feed grade zinc oxide (F-ZnO), nano zinc oxide (N-ZnO) or coated zinc oxide (C-ZnO), at doses of 120 mg/kg (calculated as zinc). The experiment lasted for 42 days and was divided into two stages as early stage (days 1 to 21) and late stage (days 22 to 42). The results showed as follows:1) compared with F-ZnO, N-ZnO and C-ZnO supplementation had no significant effects on the average daily feed intake in early, late and whole period (P>0.05), but significantly increased the average daily gain (P<0.05), and significantly decreased the ratio of feed to gain (P<0.05) at late stage of the experiment. Dietary C-ZnO supplementation significantly decreased the feed to gain ratio during the whole period (P<0.05). Dietary N-ZnO and C-ZnO could decrease diarrhea rate and health risk index of meat rabbits. 2) Compared with F-ZnO, dietary N-ZnO and C-ZnO had no significant effects on the contents of total protein, albumin, globulin, glucose, total cholesterol and triglyceride and the activities of aspartate aminotransferase and alanine aminotransferase in serum of meat rabbits (P>0.05); serum zinc and copper contents were not significantly affected (P>0.05), but serum iron content was significantly increased in the early stage of the experiment (P<0.05), and decreased in the late stage of the experiment (P<0.05). Dietary N-ZnO supplementation significantly increased serum alkaline phosphatase activity at day 42 of the experiment (P<0.05). 3) Compared with F-ZnO, C-ZnO supplementation significantly increased serum glutathione peroxidase (GSH-Px) activity at day 21 of the experiment (P<0.05). Dietary N-ZnO and C-ZnO significantly decreased liver malondialdehyde (MDA) content at day 42 of the experiment (P<0.05). In conclusion, dietary supplemented with N-ZnO and C-ZnO can improve the activity of serum antioxidant enzymes, reduce liver oxidative stress, reduce the health risk and improve growth performance of meat rabbits; and C-ZnO has a better effect than N-ZnO.

Cite this article

CAI Jingyi , WU Shuang , KUANG Yinggu , LIU Guangmang , ZHAO Hua , JIA Gang , TIAN Gang . Effects of Different Forms of Zinc Oxide on Growth Performance, Serum Biochemical Indexes and Antioxidant Capacity of Meat Rabbits[J]. Chinese Journal of Animal Nutrition, 2022 , 34(11) : 7342 -7349 . DOI: 10.3969/j.issn.1006-267x.2022.11.051

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