摘要
为探讨獭兔育肥后期饲粮中适宜的赖氨酸和含硫氨基酸比例,选择3月龄白色獭兔300只,随机分成6组,每组50只;对照组饲喂赖氨酸(0.80%)与含硫氨基酸(0.56%)比例为1∶0.7的基础日粮,试验Ⅰ组~试验Ⅴ组通过添加蛋氨酸调整赖氨酸与含硫氨基酸比例分别至1∶0.8、1∶0.9、1∶1.0、1∶1.1、1∶1.2;试验期为50 d,试验期间观察并记录各组獭兔的发病和死亡情况,试验结束时,测定并比较各组獭兔的被毛密度和被毛长度,分析皮张等级及市场比价,计算各组獭兔成活率。结果表明,试验Ⅱ组的被毛密度极显著高于对照组、试验Ⅲ组、试验Ⅴ组(P<0.01),显著高于试验Ⅳ组(P<0.05),试验Ⅰ组的被毛密度显著高于对照组、试验Ⅲ组、试验Ⅴ组(P<0.05);不同赖氨酸和含硫氨基酸比例对獭兔被毛长度无显著影响(P>0.05);一级皮张以试验Ⅰ组和试验Ⅱ组最多,均为25张,试验Ⅱ组的优级皮比例最高,达到73.33%;与试验Ⅱ组相比,对照组、试验Ⅲ组、试验Ⅳ组和试验Ⅴ组分别少收入4.75%、8.29%、5.70%和13.62%;试验Ⅰ组成活率最高,为100%,试验Ⅴ组成活率最低,为88.00%。综上表明,在该试验条件下(赖氨酸含量为0.80%),獭兔育肥后期饲粮中的赖氨酸与含硫氨基酸比例以(1∶0.8)~(1∶0.9)效果最好。
In order to determine the appropriate dietary lysine and sulfur amino acid ratio for Rex Rabbit in late fattening period, a total of 300 3-month-old white Rex Rabbit were randomly and averagely divided into six groups. The lysine(0.80%) and sulfur amino acid(0.56%) ratio in basal diet of control group was 1∶0.7 and that of experimental Ⅰ to Ⅴ group was adjust to 1∶0.8, 1∶0.9,1∶1.0, 1∶1.1, 1∶1.2 by supplementing methionine. The experimental period lasted for 50 days; the disease incidence and mortality of Rex Rabbits in each group during the whole experiment period were observed and recorded, and the survival rate was calculated; at the end of the experiment, the hair density and hair length of Rex Rabbits in different groups were determined and statistically compared; the fur quality and market price of Rex Rabbits in different groups were evaluated and compared. The results revealed that the hair density of experimental Ⅱ group was very significantly higher than that of control group,experimental Ⅲ group and experimental Ⅴ group(P<0.01), and was significantly higher than that of experimental Ⅳ group(P<0.05); the hair density of experimental Ⅰ group was significantly higher than that of control group, experimental Ⅲ group and experimental Ⅴ group(P<0.05); different dietary lysine and sulfur amino acid ratio had no significant impact on hair length of Rex Rabbit(P>0.05); there were 25 pieces of first-grade fur in both experimental Ⅰ group and experimental Ⅱ group which were more than that in the other groups; the highest proportion(73.33%) of superior-grade fur was obtained in experimental Ⅱgroup; the income from fur selling of control group, experimental Ⅲ group, experimental Ⅳ group and experimental Ⅴ group was4.75%, 8.29%, 5.70%, 13.62% less than that of experimental Ⅱ group; the highest(100%) and the lowest survival rate(88.00%) were observed in experimental Ⅰ group and experimental Ⅴ group, respectively. Under the experimental condition(basal diet containing 0.80% of lysine) of this study, the recommended dietary lysine and sulfur amino acid ratio for Rex Rabbit in late fattening period was(1∶0.8)-(1∶0.9).
引文
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