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Journal of Integrative Agriculture  2024, Vol. 23 Issue (04): 1329-1337    DOI: 10.1016/j.jia.2023.04.041
Animal Science · Veterinary Medicine Advanced Online Publication | Current Issue | Archive | Adv Search |

Responses of growth performance, antioxidant function, small intestinal morphology and mRNA expression of jejunal tight junction protein to dietary iron in yellow-feathered broilers

Kaiwen Lei1, 2, Hao Wu1, 2, Jerry W Spears3, Xi Lin3, Xi Wang1, 2, Xue Bai1, 2, Yanling Huang1, 2#

1 Key Laboratory of Animal Science of State Ethnic Affairs Commission, Southwest Minzu University, Chengdu 610041, China

2 Key Laboratory of Qinghai–Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Southwest Minzu University, Chengdu 610041, China

3 Department of Animal Science, North Carolina State University, Raleigh, NC 27695-7621, USA

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摘要  

本试验旨在研究饲粮不同铁水平添加1-21日龄黄羽肉鸡生长性能、抗氧化功能、肠道形态和空肠紧密连接蛋白基因表达的影响,探讨饲粮铁添加水平与以上各指标间的剂量效应7201日龄黄羽肉公雏按照体重随机分成9个组,每组8个重复,每个重复10只鸡。对照组饲喂不额外添加铁的基础饲粮(实测铁含量为79.6 mg kg-1),铁添加组分别饲喂以七水硫酸亚铁(FeSO4·7H2O)形式添加204060801603206401280 mg kg-1铁的试验饲粮。试验期21 d。各组试鸡于21日龄屠宰分析血浆、肝脏、十二指肠和空肠黏膜抗氧化指标(T-SOD, GSH-Px, MDA)、十二指肠及空肠肠道形态(绒毛高度、隐窝深度、绒隐比)以及十二指肠及空肠紧密链接蛋白(Claudin-1, Occludin, ZO-1mRNA表达水平结果表明与对照组相比,添加20 mg kg-1铁提高了黄羽肉鸡的平均日增重(ADG)(P<0.0001),而与添加20 mg kg-1铁组相比,添加6401280 mg kg-1铁降低了黄羽肉鸡的ADG(P<0.0001)和平均日采食量(ADFI)(P<0.0001。黄羽肉鸡血浆和十二指肠中丙二醛(MDA浓度粮铁添加量的升高直线上升(P<0.0001),肝脏和空肠MDA浓度线性P<0.05二次曲线上升P<0.05)。与添加20 mg kg-1铁相比,添加640 mg Fe kg-11280 mg kg-1铁提高了血浆、肝脏和十二指肠中的MDA浓度十二指肠和空肠绒毛高度(VH以及十二指肠绒毛高度/隐窝深度(V/C)随饲粮铁添加量的增加线性降低(P˂0.05)。与添加20 mg kg-1铁相比,添加640 mg Fe kg-11280 mg kg-1铁降低了十二指肠和空肠中的VHP<0.05随着饲粮铁添加量的增加,空肠中闭合蛋白1Claudin-1)的mRNA表达水平线性降低(P=0.001),咬合蛋白(Occludin闭合小环蛋白1ZO-1)的mRNA表达水平线性P<0.05二次曲线降低(P<0.05)。与添加20 mg kg-1铁相比,饲粮320mg kg-1铁添加降低了空肠Occludin mRNA表达水平P<0.05),饲粮1280 mg kg-1铁添加降低了Claudin-1 ZO-1 mRNA表达水平P<0.05)。综上所述,黄羽肉鸡饲粮中添加640 mg kg-1及以上的铁会导致黄羽肉鸡生长性能下降、抗氧化性能降低、肠道形态受损,饲粮1280 mg kg-1铁添加同时会降低空肠紧密连接蛋白的基因表达



Abstract  This study aimed to investigate the dose-effect of iron on growth performance, antioxidant function, intestinal morphology, and mRNA expression of jejunal tight junction protein in 1- to 21-d-old yellow-feathered broilers.  A total of 720 1-d-old yellow-feathered male broilers were allocated to 9 treatments with 8 replicate cages of 10 birds per cage.  The dietary treatments were consisted of a basal diet (contained 79.6 mg Fe kg–1) supplemented with 0, 20, 40, 60, 80, 160, 320, 640, and 1,280 mg Fe kg–1 in the form of FeSO4·7H2O.  Compared with the birds in the control group, birds supplemented with 20 mg Fe kg–1 had higher average daily gain (ADG) (P<0.0001).  Adding 640 and 1,280 mg Fe kg–1 significantly decreased ADG (P<0.0001) and average daily feed intake (ADFI) (P<0.0001) compared with supplementation of 20 mg Fe kg–1.  Malondialdehyde (MDA) concentration in plasma and duodenum increased linearly (P<0.0001), but MDA concentration in liver and jejunum increased linearly (P<0.05) or quadratically (P<0.05) with increased dietary Fe concentration.  The villus height (VH) in duodenum and jejunum, and the ratio of villus height to crypt depth (V/C) in duodenum decreased linearly (P˂0.05) as dietary Fe increased.  As dietary Fe increased, the jejunal relative mRNA abundance of claudin-1 decreased linearly (P=0.001), but the jejunal relative mRNA abundance of zona occludens-1 (ZO-1) and occludin decreased linearly (P˂0.05) or quadratically (P˂0.05).   Compared with the supplementation of 20 mg Fe kg–1, the supplementation of 640 mg Fe kg–1 or higher increased (P˂0.05) MDA concentrations in plasma, duodenum, and jejunum, decreased VH in the duodenum and jejunum, and the addition of 1,280 mg Fe kg–1 reduced (P˂0.05) the jejunal tight junction protein (claudin-1, ZO-1, occludin) mRNA abundance.  In summary, 640 mg of supplemental Fe kg–1 or greater was associated with decreased growth performance, increased oxidative stress, disrupted intestinal morphology, and reduced mRNA expression of jejunal tight junction protein.
Keywords:  iron        yellow-feathered broiler        antioxidant function        intestinal morphology        tight junction protein   
Received: 30 December 2022   Accepted: 22 March 2023
Fund: This work was supported by the National Natural Science Foundation of China (31501977), the Sichuan Provincial Key R&D Project, China (22ZDYF0194), and the Double World-Class Project of Southwest Minzu University, China (XM2023010).

About author:  Kaiwen Lei, E-mail: lkw19960813@163.com; #Correspondence Yanling Huang, Tel: +86-28-85522310, E-mail: swunylh@163.com

Cite this article: 

Kaiwen Lei, Hao Wu, Jerry W Spears, Xi Lin, Xi Wang, Xue Bai, Yanling Huang. 2024.

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