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益生素对皖南黄鸡生产性能和肉品质量影响的研究
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摘要
本试验选用1日龄皖南黄肉用仔鸡400只,随机分成5组,每组80
    只,分别以0、0.2%、0.4%、0.6%、0.8%水平的益生素添加于基础日粮
    中,本试验用益生素由地衣芽孢杆菌和枯草芽孢杆菌两菌株组成。每组鸡分
    别饲喂一种日粮,饲喂6周。通过对皖南黄鸡生长性能、屠宰性能、肉样化
    学组成和肉品质量指标的分析,研究益生素对皖南黄鸡生产性能和肉品质量
    的影响,并对不同水平的益生素组进行比较。
     试验结果表明,0-3周龄,饲喂益生素的各组鸡的平均体重、平均日
    增重比对照组有所提高(P>0.05);平均日采食量均低于对照组,料重比分
    别比对照组低1.30%、4.65%、3.85%、2.55%,其中以0.4%和0.6%两水平的
    益生素组饲料转化率较好。4周龄末,饲喂益生素的各组鸡的平均体重分别
    比对照组增加3.35%、5.71%、5.79%、2.50%;料重比分别比对照组低
    3.38%、9.89%、11.03%,3.30%。0.4%和0.6%水平的益生素组的平均体重
    显著高于对照组(P<0.05);0.2%、0.8%水平的益生素组的平均体重与对照
    组差异不显著;各益生素组之间平均体重差异不显著。5周龄末,各益生素
    组鸡的平均体重分别比对照组增加4.47%、6.29%、11.00%、2.57%;0.4%和
    0.6%水平的益生素组平均体重显著提高(P<0.05);0.6%水平益生素组平均
    体重显著高于0.2%和0.8%水平的益生素组(P<0.05),其余各组无明显差
    异;0.8%益生素组的饲料转化率较差,其余各水平的益生素组的饲料转化率
    均优于对照组。6周龄末,各组鸡的平均体重差异不显著,饲料转化率均低
    于对照组。从整个饲养期来看,以0.4%和0.6%两个水平益生素组的平均日
    增重较高,平均日采食量较低,料重比较优;0.2%和0.8%水平益生素组的
    平均日增重和料重比差于对照组差。
     0.2%水平益生素组的全净膛率显著低于对照组(P<0.05);0.6%水平益
    生素组的胸肌率显著高于0.8%组(P<0.05),益生素对皖南黄鸡的其它屠
    宰性能指标无显著影响。添加益生素对肉样的化学组成、氨基酸组成无显著
    影响(P>0.05),0.8%水平益生素组的某些氨基酸含量有所增加。
    
     益生素对胸肌肉样的肌纤维直径无显著影响(P>0.05)。各益生素组肉
    样的滴水损失与对照组无明显差异,益生素组的拿破率均略低于对照组
     (P>0.05)。益生素组的水浴损失分别比对照组高 31.07%、38.28%、
    16.22见41.17兄 除0.6%水平的益生素组外,其它水平的益生素组的水浴
    损失均与对照组间差异显著(P<0.05),这表明对照组肌肉的系水力较高。
    系水力的这三项指标综合表明益生素使肉的系水力有降低趋势,其中0.8%
    水平的益生素组的系水力最差。
     益生素组的L”值均略高于对照组(P>0‘05)。益生素组的d值与对照
    组差异不显著,但益生素组之间存在差异。0.8%水平益生素组的d值显著
    高于 0.4%水平的益生素组叩m.05)。0.6兄 0.8%水平的益生素组 b”值显
    著高于对照组(P<O.05);o.2%、0.4%水平的益生素组的r值高于对照组
    但差异不显著,0.8%水平益生素组的b”值显著高于02%益生素组
     (P<0.05)。
     益生素组PH;值均高于对照组,0.2%水平的益生素组的PH;值显著高于对
    照组u们.05),其余水平的益生素组之间差异不显著。益生素组肉样的
    PHU值与对照组无明显差异。0.2%水平益生素组出 值显著高于0.4%、0.8%
    水平的益生素组(P<0.05)。
Four hundred Wan Nan Huang broilers of 1-day-old were allotted to five groups randomly, 80 broilers for each group. The probiotics composed of Bacillus Licheniformis and Bacillus Subtilis were added to the diet at the level of 0, 0.2%, 0.4%, 0.6%, 0.8% respectively. Each group was fed with an assigned diet for 6 weeks. Growth performances, slaughter performances, chemical components of the breast muscle, meat quality parameters were measured to evaluate the effects of different levels of probiotics on Wan Nan Huang broilers.
    The results showed that during 0-3 weeks Wan Nan Huang broilers fed with probiotics had a slightly higher average body weight (P>0.05), higher daily gain and less daily feed intake than the control. Feed conversion rates of probiotic groups were higher by 1.30%. 4.65%, 3.85%, 2.55% than the control respectively. The groups at 0.4% and at 0.6% had more efficient feed conversion rates. By the end of week 4, the average body weights of probiotic groups increased by 3.35%, 5.71%, 5.79%, 2.50% and the feed conversion rates improved by 3.38%, 9.89%, 11.03%, 3.30% than the control respectively. The average body weights of the groups at 0.4%, 0.6% were significantly higher than that of the control (p<0.05), and those of the groups at 0.2% and 0.8% did not significantly defer from that of the control. The average body weights were not significant among probiotic
    
    
    
    groups. By the end of week 5, the average body weight of each probiotic group increased by 4.47%, 6.29%, 11.00%, 2.57% respectively. The average body weights of the groups at 0.4% and at 0.6% were significantly higher than that of the control (p<0.05). The average body weight of the group at 0.6% was significantly higher than those of the groups at 0.2% and 0.8% (p<0.05). All probiotic groups except the group at 0.8% had high feed conversion rates. By the end of week 6, probiotic groups had worse feed conversion rates than the control; the average body weights of all groups were not significantly different (p>0.05). During the whole feeding period, the groups at 0.4% and at 0.6% increased average body weight, reduced average daily intake, improved feed conversion rate; on the contrary, the average daily gams and feed conversion rates of the groups at 0.2% and 0.8% were worse even than those of the control.
    Net carcass percentage of the group at 0.2% was significantly lower than that of the control (p<0.05) and the breast muscle rate of the group at 0.6% was higher than that of the group at 0.8%(p<0.05), but the other slaughter performance parameters of the probiotic groups were not significantly different from those of the control. Probiotics had no effects on the chemical components of the breast muscle, neither on amino acids contents, however, the group at 0.8% had a tendency to increase the contents of some ammo acids.
    Muscle fiber diameter was not influenced by the probotic treatments. Probiotics did not improve drip loss and Napole yield of the breast muscle. The Napole yields of the probiotic groups were lower than that of the control. The cooking losses of the probiotic groups were higher than that of the control by 31.07%, 38.28%, 16.22%, 41.17% respectively, so the cooking losses of all probiotic groups except for the group at 0.6% were significantly different from that of the control (p<0.05). This showed that the probiotics did not improve water- holding capacity of breast muscle, but could reduce it, with water- holding capacity of the group at 0.8% at the lowest level.
    L* values of the probiotic groups were slightly higher than that of the control (p>0.05). There were no significant differences of a* values between the probotic groups and the control, however, a* values were significantly different among
    
    
    
    probotic groups. The a* value of the group at 0.8% was higher than that of the group at 0.4% (p<0.05). Both the group at 0.6% and at 0.8% had higher b* values than the control (p<0.05); the groups at 0.2% and at 0.4% had higher b* values than the control, but not significantly. The group at 0.8% had highe
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