脆化专用饲料对罗非鱼生长和肌肉品质的影响

为考察脆化饲料对罗非鱼(Tilapia)生长和肌肉品质的影响,实验分别以配合饲料(对照组)、脆化饲料(试验组)喂养体质量为(115.30±23.69)g的罗非鱼99 d。结果显示:配合饲料组和脆化饲料组罗非鱼的增重率分别为185.25%、94.96%;饲料系数为1.87、2.94;肥满度为15.23、12.50;肌肉粗蛋白含量为19.40%、18.26%;粗脂肪含量为0.75%、1.32%;胶原蛋白为2.03、2.91;肌原纤维耐折力为33.93μm、64.84μm;滴水损失为2.59%、1.82%。与对照组相比,在生长方面,脆化饲料组罗非鱼增重率、肥满度显著降低,饲料系数显著增加(P<0.05);在肌肉品质方面,肌肉的粗蛋白含量和滴水损失显著降低,而粗脂肪含量、胶原蛋白含量和肌原纤维耐折力显著提高(P<0.05)。结果表明,脆化饲料在一定程度上改善了罗非鱼的肌肉品质。

Effects of feeding embrittlement feed on growth and flesh quality of Tilapia

A study was conducted to investigate the effect of feeding embrittlement feed on growth performance and flesh quality of tilapia.Tilapias with body weight of(115.3±23.69) g were fed with formula feed and embrittlement feed for 99 days.The feeding trial shows that the growth rate of tilapia fed with formula feed and embrittlement feed were 185.25% and 94.96%;feed conversion ratios were 1.87 and 2.94,condition factors were 15.23 and 12.50,separately.The analysis of flesh quality showed that the muscle’s crude protein contents were 19.40% and 18.26%;crude fat contents were 0.75% and 1.32%,collagen content were 2.03 and 2.91,length of myofibril were 33.93 μm,64.84 μm,drip loss were 2.59% and 1.82%for tilapia fed with formula feed and embrittlement feed.Compared with control group,the growth rate and condition factor decreased significantly(P<0.05),but feed conversion ratios increased obviously(P<0.05) in growth;crude protein content and drip loss decreased significantly(P<0.05),but muscle’s crude lipid content,collagen content and myofibfil length increased obviously(P<0.05) in the muscle quality.The results above showed that embrittlement feed improved flesh quality of tilapia to acertain degree.