This experiment was conducted to investigate the effects of dietary vitamin B6 supplemental level on growth performance, fur quality, muscle quality and vitamin B6 metabolism of growing Rex rabbits. Two hun-dred 3-month-old healthy Rex rabbits with similar body weight were randomly divided into 5 groups with 40 replicates in each group and each replicate contained 1 rabbit. Rabbits in 5 groups were fed experimental diets containing 0 (control), 5, 10, 20 and 40 mg/kg vitamin B6, respectively. The trial lasted for 7 days for ad-aptation, and 53 days for test. The results showed that dietary vitamin B6 supplemental level had significant in-fluence on average daily gain (ADG) and average daily feed intake (ADFI) (P=0.017 8 and P=0.000 4, respectively) , and the highest values of ADG and ADFI were found when vitamin B6 supplemental level was 20 mg/kg. With the vitamin B6 supplemental level increasing, the feed/gain ( F/G) was firstly decreased and then increased, and it had the lowest value when vitamin B6 supplemental level was 20 mg/kg. Dietary vitamin B6 supplemental level had significant influences on fur weight and fur area ( P=0.040 0 and P=0.001 6, re-spectively) , but had no significant influences on fur thickness and wool length ( P=0.478 0 and P=0.756 2, respectively) . The fur weight and fur area in 20 mg/kg group were significantly higher than those in control group (P<0.05 or P<0.01). Dietary vitamin B6 supplemental level had significant influences on pH (P=0.039 4) , red value ( a?) ( P=0.013 1) , yellow value ( b?) ( P=0.023 9) and light value ( L?) of muscle ( P=0.002 5) . The muscle b? and L? were significantly lower than those in control group ( P<0. 05 or P<0.01) , while the muscle a?was significantly higher than that in control group ( P<0.05) . Dietary vitamin B6 supplemental level had no significant influences on muscle water loss rate and shear force ( P=0.216 1 and P=0.825 9, respectively) . Dietary vitamin B6 supplemental level had no significant influences on vitamin B6 con-tent in muscle, liver and urine ( P=0.028 3, P=0.000 1 and P=0.008 1, respectively) , but had no signifi-cant influence on vitamin B6 content in serum (P=0.112 9). The muscle and liver vitamin B6 contents in 20 mg/kg group were significantly higher than those in control group (P<0.05 or P<0.01). Considering all indexes of this experiment, the appropriate vitamin B6 supplemental level is 20 mg/kg for 3 to 5-month-old growing Rex rabbits.%本试验旨在研究饲粮维生素B6 添加水平对生长獭兔生长性能、皮张质量、肌肉品质以及维生素B6 代谢的影响. 试验选用200只体重相近、健康状况良好的3月龄獭兔,随机分成5组,每组40 个重复,每个重复 1 只,分别饲喂在基础饲粮基础上添加 0 (对照)、5、10、20 和40 mg/kg维生素B6 的试验饲粮. 预试期7 d,正试期53 d. 结果表明:饲粮维生素B6 添加水平对平均日增重有显著影响( P=0.017 8) ,对平均日采食量有极显著影响( P=0.000 4) ,二者均在维生素B6 添加水平为 20 mg/kg 时达到最高值. 随着维生素 B6 添加水平的升高,料重比( F/G)有先降低后升高趋势,并在维生素B6 添加水平为20 mg/kg时达到最低值. 饲粮维生素B6 添加水平对獭兔皮张重量有显著影响( P=0. 040 0 ) ,对皮张面积有极显著影响( P=0.001 6) ,对皮张厚度和被毛长度无显著影响( P=0.478 0和P=0.756 2). 20 mg/kg添加组的皮张重量、皮张面积显著或极显著高于对照组( P<0.05或P<0.01). 饲粮维生素B6 添加水平显著或极显著影响肌肉 pH(P=0.039 4)、红度值(a?) (P=0.013 1)、黄度值(b?) (P=0.023 9)、亮度值( L?) ( P=0. 002 5 ) ,其中 20 mg/kg 添加组的 L?极显著低于对照组( P<0.01),b?显著低于对照组(P<0.05),a?显著高于对照组(P<0.05). 饲粮维生素B6 添加水平对肌肉失水率和剪切力无显著影响( P=0.216 1和P=0.825 9). 饲粮维生素B6 添加水平对肌肉中维生素B6 含量有显著影响(P=0.028 3),对肝脏和尿液中维生素B6 含量有极显著影响( P=0.000 1和P=0.008 1) ,对血清中维生素B6 含量无显著影响( P=0.112 9). 20 mg/kg添加组肌肉和肝脏中维生素B6 含量显著或极显著高于对照组( P<0.05或 P<0.01). 综合本试验测定指标,3~5月龄生长獭兔饲粮适宜的维生素B6 添加水平为20 mg/kg.
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