本试验旨在研究饲粮中添加桑叶粉对育肥猪生长性能、肉品质和血清生化指标的影响。选用始重[(87.10±5.33) kg]基本一致的健康"杜×大×长"三元杂交育肥猪160头,随机分为4组(每组4个重复,每个重复10头):对照组饲喂基础饲粮,试验组分别饲喂含5%、10%、15%桑叶粉饲粮,试验期50 d。结果表明:与对照组相比,1)饲粮中添加5%和10%的桑叶粉对育肥猪平均日增重影响不显著(P>0.05);添加15%的桑叶粉显著降低育肥猪平均日增重和显著提高料重比(P<0.05)。2)添加5%和10%桑叶粉对屠宰后45 min、24 h肌肉剪切力和pH影响不显著(P>0.05),可提高肌肉的大理石纹评分,但差异不显著(P>0.05);当桑叶粉添加15%时,平均背膘厚和肌肉总胆固醇含量显著降低(P<0.05)。3)添加5%、10%、15%桑叶粉能显著提高肌肉中超氧化物歧化酶的活性(P<0.05),降低肌肉中丙二醛的含量(P>0.05),有效提高肌肉的抗氧化能力。4)添加5%、10%、15%桑叶粉血清尿素氮含量均显著提高(P<0.05),脂肪酶活性降低,但差异不显著(P>0.05),饲粮中添加15%桑叶粉能显著降低血清甘油三酯含量(P<0.05)。综合各项指标,饲粮中添加10%的桑叶粉对育肥猪生长速度影响较小,但可有效提高肉品质。

This study was aimed to investigate the effects of mulberry leaf powder on growth performance, meat quality and serum biochemical indexes in finishing pigs. One hundred and sixty ‘Duroc×Yorkshire×Landrace’ health finishing pigs with initial weight of (87.10±5.33) kg were randomly divided into four groups with four replicates in each group and ten pigs in each replicate. Pigs in the four groups were fed with a basal diet (control group, group Ⅰ), the basal diet containing 5% mulberry leaf powder (group Ⅱ), the basal diet containing 10% mulberry leaf powder (group Ⅲ),and the basal diet containing 15% mulberry leaf powder (group Ⅳ), respectively. The experiment lasted for 50 days. The results showed as follows:compared with the control group, 1) the average daily gain of finishing pigs fed diet containing 5% and 10% mulberry leaf powder was not significantly different (P>0.05), the average daily gain was significantly decreased and the ratio of feed to gain was significantly increased in pigs fed diet containing 15% mulberry leaf powder (P<0.05). 2) Shear force and pH of muscle at 45 min and 24 h post-slaughter were not significantly different in finishing pigs fed diet containing 5% and 10% mulberry leaf powder (P>0.05), but marbling score was increased with no significantly different (P>0.05). Backfat thickness and cholesterol content in muscle were significantly decreased in pigs fed diet containing 15% mulberry leaf powder (P<0.05). 3) As diet mulberry leaf powder level was 5%, 10% and 15%, the SOD activity was significantly increased (P<0.05) and malonaldehyde content was significantly decreased (P>0.05), and the antioxidant performance of muscle was improved. 4) Urea nitrogen content in serum was significantly increased in pigs fed diets containing 5%, 10% and 15% mulberry leaf powder (P<0.05), lipase activity was decreased with no significantly different (P>0.05), and triglyceride content was significantly decreased in pigs fed diet containing 15% mulberry leaf powder (P<0.05). In conclusion, diet containing 10% mulberry leaf powder has less effect on the growth rate of finishing pigs, while can improve meat quality.