饲粮添加壳寡糖和干酪乳杆菌对肉鸡生长性能、肌肉品质及抗氧化性能的影响

Effects of Dietary Chitosan Oligosaccharide and Lactobacillus casei on Growth Performance,Meat Quality and Antioxidant Function of Broilers

本试验旨在研究饲粮中添加壳寡糖与干酪乳杆菌对肉鸡生长性能、肌肉品质及抗氧化性能的影响。选用1日龄爱拔益加(AA)健康肉公鸡240只,随机分为4组,每组6个重复,每个重复10只。对照组饲喂基础饲粮,试验组分别在基础饲粮中添加120 mg/kg壳寡糖、2×106CFU/g干酪乳杆菌、120 mg/kg壳寡糖+2×106CFU/g干酪乳杆菌。试验期为42 d。结果表明:1)与对照组相比,单独添加壳寡糖或壳寡糖与干酪乳杆菌共同添加可显著提高肉鸡平均日增重、胸肌和腿肌红度(a*)值,肌肉脂肪和肌苷酸含量以及胸肌单不饱和脂肪酸和多不饱和脂肪酸含量(P<0.05),显著降低胸肌饱和脂肪酸含量、腿肌黄度(b*)值(P<0.05)。2)饲粮中单独添加干酪乳杆菌显著提高腿肌脂肪及胸肌单不饱和脂肪酸含量(P<0.05),显著降低胸肌饱和脂肪酸含量(P<0.05)。3)饲粮中单独添加壳寡糖、干酪乳杆菌或二者共同添加均可显著降低血浆、胸肌和腿肌丙二醛含量(P<0.05),显著提高血浆、胸肌和腿肌总超氧化物歧化酶活性及总抗氧化能力(P<0.05),显著降低血浆肌酸激酶的活性(P<0.05)。综合分析表明,饲粮中添加壳寡糖、干酪乳杆菌或二者共同添加可提高肉鸡的生长性能和抗氧化性能,改善肌肉品质,而单独添加120 mg/kg壳寡糖效果最佳。

This study was conducted to investigate the effects of dietary chitosan oligosaccharide（COS） and Lactobacillus casei on growth performance,meat quality and antioxidant function of broilers.A total of 240 1-day-old healthy Arbor Acres male broilers were randomly allotted to 4 groups with 6 replicates per group and10 birds per replicate.The four diets included a basal diet and 3 experimental diets supplemented with120 mg/kg COS,2 × 10^6 CFU/g Lactobacillus casei,120 mg/kg COS ＋ 2 × 10^6 CFU/g Lactobacillus casei,respectively.The trial lasted for 42 d.The results showed as follows：1） compared with the control group,dietary supplementation with COS or COS and Lactobacillus casei significantly increased average daily gain,redness（a＊） value of breast and thigh muscle,contents of intramuscular fat and inosinic acid,and contents of monounsaturated fatty acid（M UFA） and polyunsaturated fatty acid（PUFA） in breast muscle of broilers（P〈0.05）,significantly decreased saturated fatty acid（SFA） content in breast muscle and yellowness（b＊） value of thigh muscle（P〈0.05）.2） Supplementation with Lactobacillus casei in diet significantly increased intramuscular fat content in thigh muscle and M UFA content in breast muscle while decreased SFA content in breast muscle（P〈0.05）.3） Dietary supplementation with COS,Lactobacillus casei or two together significantly decreased malondialdehyde（M DA） content in plasma,breast and thigh muscle（P〈0.05）,significantly increased the total superoxide dismutase（T-SOD） activity and total antioxidant capacity（T-AOC） in plasma,breast and thigh muscle（P〈0.05）,meanwhile decreased the creatine kinase（CK） activity in plasma（P〈0.05）.The results indicate that dietary supplementation with COS,Lactobacillus casei or both together can increase growth performance and antioxidant function and promote meat quality of broilers,and 120 mg/kg COS supplementation gets the best effect.