水貂不同赖氨酸、蛋氨酸水平颗粒饲料对营养物质消化代谢的影响

Effects of Pellet Diets with Different Lysine and Methionine LLevel on Nutrient Digestion and Metabolism of Mink

为确定水貂适宜氨基酸组成、降低饲料成本,试验选取成年健康公母水貂各60只,随机分成6组,采用2×3因子试验设计,即赖氨酸2个水平,分别为1.85%和1.7%,蛋氨酸3个水平分别为0.81%、0.99%和1.24%,对采食正常试验组水貂进行了消化代谢试验。结果表明:①日粮赖氨酸水平的变化对公母貂干物质摄入、排出及消化率影响不显著(P>0.05);蛋氨酸水平的变化对母貂干物质摄入、排出及消化率影响不显著(P>0.05),公貂粪干物质排出量蛋氨酸水平为0.99%组显著低于蛋氨酸水平为1.24%组(P<0.05),公貂干物质消化率蛋氨酸水平为0.99%组极显著地高于蛋氨酸水平为0.81%组和1.24%组(P<0.01)。②日粮赖氨酸水平的变化对公母貂有机物摄入、排出及消化率影响不显著(P>0.05);蛋氨酸水平的变化对公母貂有机物摄入、排出及母貂消化率影响不显著(P>0.05),公貂蛋氨酸水平为0.99%组有机物消化率显著高于蛋氨酸水平为0.81%组(P<0.05),与蛋氨酸水平为1.24%组差异不显著(P>0.05)。③公母貂蛋白质消化代谢受赖氨酸水平变化的影响不显著(P>0.05);公母貂蛋白质摄入及粪蛋白的排出受蛋氨酸水平变化影响不显著(P>0.05),蛋氨酸为1.24%时公貂尿蛋白排出显著高于0.99%水平组(P<0.05),与0.81%水平组尿蛋白排出差异不显著(P>0.05);公貂蛋白存留0.99%水平组极显著高于1.24%水平组(P<0.01);公貂蛋白质消化率0.99%水平组显著高于1.24%水平组(P<0.05),与0.81%水平组差异不显著(P>0.05);母貂蛋氨酸水平变化对各消化代谢率指标影响不显著(P>0.05)。④1.85%赖氨酸水平组公貂赖氨酸摄入、尿排出及消化代谢率均显著高于1.7%赖氨酸水平组(P<0.05),母貂间差异不显著(P>0.05),赖氨酸水平对公母貂蛋氨酸摄入、粪尿排出及消化代谢率无显著影响(P>0.05);蛋氨酸水平对公母貂赖氨酸摄入、粪尿排出无显著影响(P>0.05),蛋氨酸0.99%水平公貂赖氨酸消化代谢率均极显著高于蛋氨酸1.24%水平和0.81%水平公貂(P<0.01),蛋氨酸水平对母貂间赖氨酸消化代谢率无显著影响(P>0.05);蛋氨酸水平对公母貂蛋氨酸摄入、粪尿排出及消化代谢率均有显著影响(P<0.05),随着蛋氨酸水平的降低,蛋氨酸的摄入逐渐降低,而尿排出蛋氨酸1.24%组显著高于0.99%和0.81%水平组(P<0.05);蛋氨酸0.99%和1.24%水平组公母貂蛋氨酸的消化代谢率均极显著高于0.81%水平组(P<0.01),蛋氨酸0.99%和1.24%水平组公母貂蛋氨酸的消化代谢率无显著差异(P>0.05)。

In order to explore the feasible amino acid composition of mink diets and reduce the feed cost, 60 adult male and female minks in the period of growing - furring were selected respectively, and randomly allocated to 6 groups which were fed with the pellet diets consisted of different lysine（ 1.85 % and 1.7 % ） and methionine （0.81%, 0.99 % and 1.24 % respectively） level in a 2 x 3 factors experiment design. The feeding and balance trails were carried out. The trails results were as follows：①The dry matter （DM） intake, DM excretion and digestibility of male and female mink fed with different lysine（LYS） level diets and those of female mink fed with different methionine（MET） level diets had no difference（ P 〉 0.05）. The feces DM excretion of male minks fed with 0.99 % MET diets was lower than those fed with 1.24% MET diets（ P 〈 0.05）. The DM digestibility of the male minks fed with 0.99% MET diets were higher significantly than those fed with 0.81% and 1.24% MET diets（ P 〈 0.01 ）. ②The organic matter （OM） intake, OM excretion and digestibility of male and female minks fed with different LYS level diets had no difference （ P 〉 0.05） . The OM intake, OM excretion of male and female mink and OM digestibility of female minks fed with different MET level diets had no difference（ P 〉 0.05）. The OM digestibility of the male minks fed with 0.99% MET diets were higher significantly than those fed with 0.81% MET diets （ P 〈 0.05）, and had no difference with 1.24 % MET diets （ P 〉 0.05 ）. ③The digestion and metabolism of male and female minks fed with different LYS level diets had no difference （ P 〉 0.05）. The crude protein（CP） intake and CP excretion had no significant influence when diet MET level of the male mink changed （ P 〉 0.05）. The urine CP excretion of male mink fed with fed with 1.24 % MET diets were higher significantly than those fed with 0.99% MET diets（ P 〈 0.05）, and had no dif- ference with 0.81% MET diets （ P 〉 0.05 ）. The CP deposit of male mink fed with 0.99 % MET diets were higher significantly than those fed with 1.24% MET diets（ P 〈 0.01）. The CP digestibility of male mink fed with 0.99 % MET diets were higher significantly than those fed with 1.24 % MET diets （ P 〈 0.05）, and had no difference with 0.81% MET diets（ P 〉 0.05）. The digestion and metabolism of female mink fed with different MET level diets had no difference（ P 〉 0.05）.④The LYS intake, urine excretion and digestibility and metabolic rate of male minks fed with 1.85 % LYS level diet were higher significantly than those fed with 1.85 % LYS level diet （ P 〈 0.05 ）, and had no difference among female mink（ P 〉 0.05）. The MET intake, feces and urine excretion and digestibility and metabolic rate of male and female minks fed with different LYS level diet had no significant difference（ P 〉 0.05）. The LYS intake, feces and urine excretion of male and female minks fed with different MET level diet had no significant difference（ P 〉 0.05）. The digestibility and metabolic rate of male minks fed with 0.99% MET level diet were higher than those fed with 1.24 % and 0.81% MET level diet（ P 〈 0.01 ）, and had no difference among female mink （ P 〉 0.05）. The different diet MET level influenced the MET intake, feces and urine excretion and digestibility and metabolic rate in male and female minks（ P 〈 0.05）, and with the MET level decreased the MET intake decreased gradually. The MET urine excretion of the male and female minks fed with the 1.24 % MET level diet was higher than those fed with the 0.99 % and 0.81% MET level diet （ P 〈 0.05）. The MET digestibility and metabolic rate was higher significantly in the 0.99% and 1.24% MET level groups than that in the 0.81% MET level groups（ P 〈 0.05）. The MET digestibility and metabolic rate between the 0.99% MET level groups and the 1.24% MET level groups had no significant difference（P 〉 0.05）.