水貂酪氨酸酶(TYR)基因克隆、SNPs筛查及其皮肤组织mRNA差异表达分析

旨在克隆和分析水貂酪氨酸酶(tyrosinase,TYR)基因编码区,揭示该基因编码区SNPs及其皮肤组织mRNA差异表达规律与水貂毛色表型的关系.本研究采集7月龄雄性金州黑水貂、名威银蓝水貂和红眼白水貂共计301个样本的血液,利用聚合酶链式反应(PCR)方法对水貂TYR基因5个外显子进行分段克隆,并拼接获得其完整编码...     

水貂生长激素基因多态性与体质量性状的关联分析

以水貂的生长激素基因(GH)作为候选基因,采用单链构象多态性和DNA测序的方法检测GH基因单核苷酸多态性(SNPs),并针对该群体特点建立合适的统计分析模型,探讨GH基因多态性与体质量性状的相关性。结果表明,C→A突变产生的3种基因型间的水貂个体体质量存在一定的差异(P0.05),BB基因型个体与AA基因型个体之间有一定的差异(P0.05)。T→A和C→G突变没有导致氨基酸的变化,DD基因型个体体质量平均值要高于CC基因型,但产生的3种基因型对水貂体质量的影响没有显著性差异(P0.05)。统计各基因型之间的组合给水貂体质量带来的影响时,发现不同基因型之间的组合对所检测水貂样本的体质量有影响(P0.05)。     

水貂ASIP基因单倍型检测及其皮肤组织mRNA差异表达分析

试验旨在探究鼠灰色（agouti signaling protein，ASIP）基因单核苷酸多态性（single nucleotide polymorphisms，SNPs）形成的单倍型及皮肤组织差异表达mRNA对水貂被毛色素沉积的影响。通过PCR扩增、Sanger测序技术对金州黑水貂、红眼白水貂和名威银蓝水貂ASIP基因进行SNPs单倍型检测分析，利用实时荧光定量PCR技术检测3种毛色皮肤组织ASIP基因的表达量，分析单倍型及mRNA差异表达与毛色表型的相关性。结果表明，301个样本中共检测到10个SNPs，内含子2中4个SNPs （G18A、A159G、G235T、C1189T）共形成10种单倍型（Hap1~Hap10），其中Hap1（GAGC）和Hap2（GAGT）是3种不同毛色水貂群体的共享单倍型；部分内含子3中6个SNPs （C252T、A290C、G298C、A340G、T343C、T379C）形成4种单倍型（Hap1~Hap4），且Hap2（CCCGCC）是名威银蓝水貂群体的主体单倍型。5个位点（A290C、G298C、A340G、T343C、T379C）均处于完全连锁不平衡状态。实时荧光定量PCR检测显示，金州黑水貂和名威银蓝水貂ASIP基因mRNA表达量分别是红眼白水貂的1.25和0.95倍，三者间差异不显著（P>0.05）。研究结果初步提示，ASIP基因调控水貂不同毛色表型形成的分子机制可能存在差异。     

水貂EGF基因SNPS与皮张长度的相关性试验

以水貂的表皮生长因子基因(EGF)作为候选基因,采用单链构象多态性和DNA测序的方法检测了EGF基因单核苷酸多态性(SNPs)。针对该群体的特点建立合适的统计分析模型,并进行了EGF基因多态性与皮长性状的关联分析。结果表明,EGF基因对水貂的皮张长度有一定影响。BB基因型个体与AA基因型个体之间有一定的差异(P<0.05)。CD基因型个体皮长平均要高于CC和DD基因型,且与CC型个体差异显著(P<0.05),与DD型差异不显著(P>0.05)。统计各基因型之间的组合给水貂皮长带来的影响时,发现多数组合基因型对所检测的水貂皮长有显著影响(P<0.05)。     

Relationship Analysis Between the Polymorphism of T138A Locus in TYR Gene and Hair Color in Mink (Neovison vison)

In order to detect the polymorphism of T138A locus in tyrosinase (TYR) gene in mink and analyze the relationship between the genetic polymorphisms and phenotypes of mink hair color, the blood samples of 430 minks with five kinds of different hair color were taken and their genomic DNA were extracted. The T138A locus of TYR gene in mink was detected using PCR-RFLP method. Allele frequency and genotype frequency were calculated. Furthermore, the relationship between the polymorphism of T138A locus and hair color trait were analyzed by the statistical method of Chi-square independence test. The results showed that the T138A locus polymorphism was found with two alleles T and A,and three genotypes of TT, TA and AA. AA genotype was dominant genotype in Jilin White mink (0.9069), TT genotype was dominant genotype in Jinzhou Black mink,Pearl mink,Coffee mink and Silverblue mink, and existed mainly in Jizhou Black mink (1.0000). The association analysis of T138A locus polymorphism with hair color trait indicated that there was extremely significant correlation between TYR gene polymorphism and hair color of mink (P < 0.0001). This results indicated that the T138A locus might affect hair color phenotype, or molecular marker linked with the major gene regulating the white hair phenotype of mink.     

水貂TYR基因T138A位点多态性及其与毛色性状的关联分析

试验旨在检测水貂酪氨酸酶（tyrosinase,TYR）基因T138A位点的多态性,并分析其与水貂毛色表型的相关性。提取5种被毛色型430只水貂血液基因组DNA,采用PCR-RFLP技术,对TYR基因T138A位点进行多态性检测,统计等位基因频率与基因型频率,通过卡方（χ²）独立性检验分析该位点多态性与水貂毛色性状的相关性。结果表明,T138A位点存在2个等位基因T和A,形成TT、TA和AA 3种基因型,AA基因型在吉林白水貂群体中为优势基因型（0.9069）,而TT基因型为金州黑水貂、珍珠水貂、咖啡水貂和银蓝水貂群体的优势基因型,其中在金州黑水貂群体中基因型频率最高（1.0000）。关联分析表明,TYR基因T138A位点的多态性与毛色性状呈极显著相关（P<0.0001）。表明TYR基因T138A位点可能是影响水貂毛色的主控位点或与调控白色被毛表型主控位点连锁的分子标记。     

贵州地方山羊促卵泡素受体基因部分外显子多态性研究

本试验以贵州白山羊、黔北麻羊和贵州黑山羊3个地方品种为研究对象,采用DNA池结合PCR直接测序法对促卵泡素受体(follicle stimulating hormone receptor, FSHR)基因进行单核苷酸多态性检测,同时结合在线软件预测不同基因型的mRNA的二级结构。结果表明,在3个山羊品种中共检测到3个SNPs位点:C126T、C1246A和A1412C,其中C126T和C1246A分别位于外显子1和外显子10中,且均为同义突变,A1412C位于内含子中。对外显子1和10中的2个SNPs位点进行生物信息学分析,结果显示均导致了mRNA二级结构发生改变。     

贵州地方黄牛GHR基因遗传变异、功能预测及其与生长性状的关联性分析

为探究黄牛生长激素受体（GHR）基因多态性，筛选出对贵州地方黄牛生长性状有显著影响的SNPs位点，本研究以150头贵州地方黄牛（关岭牛、思南牛、威宁牛各50头）为研究对象，以GHR为候选基因，根据GenBank收录的黄牛GHR基因外显子序列设计引物，提取贵州地方黄牛血液基因组DNA并构建混池；通过PCR扩增测序法验证GHR基因SNPs和分型，运用DNAStar、SPSS 19.0软件对GHR基因SNPs进行遗传学分析，并与贵州地方黄牛生长性状进行关联性分析，寻找各位点不同基因型间贵州地方黄牛生长性能差异，同时使用生物信息学分析GHR突变前后mRNA二级结构的变化，预测分析贵州地方黄牛GHR蛋白的结构与功能。结果显示，贵州地方黄牛GHR基因共检测出8个SNPs，分别为Exon9-C162T、Exon9-C201T、Exon9-G243C、Exon9-G383A、Exon9-A495T、Exon9-C622T、Exon9-C642T和Exon9-A650C，其中思南牛无Exon9-G243C。遗传学分析表明，除Exon9-G243C位点在威宁牛中偏离Hardy-Weinberg平衡外，其余SNPs均未偏离Hardy-Weinberg平衡。相关性分析发现，GHR基因突变位点在关岭牛和思南牛中均未检测到显著性差异，但在威宁牛中，Exon9-G243C基因型GC个体胸围显著低于GG和CC基因型（P<0.05），Exon9-A650C基因型AA个体的体斜长、坐骨端宽均显著高于CC基因型（P<0.05），而胸深显著低于AC和CC基因型（P<0.05），其余6个SNPs差异均不显著（P>0.05）。生物信息学分析发现突变前后，除Exon9-G383A mRNA二级结构未发生改变外，其余SNPs mRNA二级结构均发生了改变，Exon9-G243C、Exon9-A650C会影响蛋白质二级结构的变化，但突变不影响蛋白质三级结构的变化。此外，贵州地方黄牛GHR蛋白是一种分泌蛋白，具有信号肽剪切位点且具有6个N-糖基化位点，证实该基因变异程度高。本研究提示GHR基因Exon9-G243C、Exon9-A650C这2个SNPs对贵州地方黄牛生长性状具有显著影响，可作为贵州地方黄牛生长发育的候选分子标记。     

组合添加剂对水貂繁殖性能的影响

为研究组合添加剂对水貂精子活力、配种率、平均窝产仔数、断奶成活率、断奶平均体重等繁殖性能的影响。选择种母貂36只、公貂6只,随机分为对照组和试验组,每组3只公貂,18只母貂,母貂设2个重复。对照组貂饲喂基础日粮,试验组在基础日粮基础中添加组合添加剂3 g/(d·只)。试验期120 d,试验期内,测定精子活力、配种率、平均窝产仔数、断奶成活率、断奶平均体重。结果显示,组合添加剂对貂的繁殖性能具有明显的改善作用。与对照组相比,试验组公貂精子活力、母貂受胎率、平均窝产仔数、仔貂断奶成活率和45日龄断奶平均体重等繁殖性能指标分别提高了2.44%、3.93%、13.04%、2.49%、1.85%。     

母貂妊娠初期体况对其繁殖力的影响

本文利用目测方法将 780只母貂分成过肥、中等、过瘦 3种体况 ,采用统计学方法进行分析。结果表明 ,妊娠初期体况对母貂繁殖力有明显的影响 ,中等体况的母貂其受胎率和产仔数均明显高于另两种体况的母貂。     

南德温杂交肉牛生长分化因子10基因多态性与体尺性状的关联分析

以98头南德温杂交肉牛血样为材料,随机抽样构建混合DNA池,利用高分辨率熔解曲线分析技术和直接测序法检测生长分化因子10(growth differentiation factor 10,GDF10)基因的序列变异,研究分析GDF10基因的多态性.采用SHEsis和PHASE软件对GDF10基因多态位点进行配对连锁不平衡和单倍型分析,采用SPSS 17.0进行基因多态位点和单倍型组合与体尺性状关联性分析.结果显示,南德温杂交肉牛GDF10基因检测到3个多态位点1113(G/A)、9569(G/A)和9628(G/A);关联分析表明,南德温杂交肉牛GDF10基因不同突变位点的基因型与体斜长、体高、胸围和管围差异显著(P<0.05);单倍型分析后在群体中发现8种单倍型组合,其中AAA、GGA与南德温杂交肉牛的体高、体斜长、胸围和管围显著相关(P<0.05).由此推断,南德温杂交肉牛GDF10基因3个多态位点和2个单倍型组合与体斜长、体高、胸围和管围显著相关,可以作为肉牛生产性状的候选分子标记,为肉牛遗传资源开发与利用提供科学依据.     

水貂隐孢子虫病流行病学调查及虫种的初步鉴定

为初步了解水貂隐孢子虫病的流行情况,作者于2005年11月份用饱和蔗糖溶液漂浮法检查了河北省肃宁县某水貂养殖场的469份粪便样品。结果,8份粪便样品为隐孢子虫阳性,总感染率为1.71%(8/469)。其中,白貂感染率为2.15%(5/233)、灰貂感染率为2.08%(1/48)、黑貂感染率为1.06%(2/188)。所查的8份隐孢子虫阳性样品均来自5~6月龄的水貂,表明幼龄水貂容易感染隐孢子虫病而老龄水貂不易感染。另外,8份阳性样品多数来自雄性水貂,显示水貂的隐孢子虫感染可能存在性别的差异性。根据卵囊形态和大小将水貂隐孢子虫初步鉴定为小球隐孢子虫(Cryptosporidium parvum)。同时,利用所收集的隐孢子虫卵囊进行了小白鼠感染试验,结果表明水貂源隐孢子虫不感染免疫抑制状态下的昆明系小白鼠。     

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

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)。     

CpG ODN对水貂免疫增强效果的研究

为获得对水貂具有免疫刺激活性的CpG ODN序列,设计合成了45种含不同CpG基序的DNA序列,应用MTS比色法测定合成CpG ODNs刺激水貂PBMC增殖的能力,结果有11条CpG ODN对水貂PBMC有刺激活性（SI＞2）;应用SI值大于5的6种CpG ODN分别与水貂伪狂犬灭活疫苗联合免疫水貂,免疫后经水貂血清抗伪狂犬中和抗体效价测定和水貂PBMC非特异性增殖效应检测,结果有3个CpG ODN序列对水貂具有较好免疫增强作用,分别是CpG-21(ATCGATTTGTCGTTATCGAT)、CpG-23(ATCGATGAACGTTAACGTTTC)和CpG-24(AACGTTCATCGATATCGATGT)。本研究获得3条对水貂具有较好免疫刺激活性的CpG ODN序列,可为水貂新型CpG佐剂的研究提供参考。     

Effects of dietary protein levels on digestibility of nutrients and growth rate in young female mink (Mustela vison)

This study investigated digestibilities of nutrients and feed efficiency in female mink at the different dietary protein levels during the mink growth period. Effects of dietary protein on growth performance of minks were also measured. Sixty 45‐day‐old healthy female minks were randomly assigned to 6 treatment groups with 10 animals in each group. Animals were fed diets varying in protein levels: 28% (Group I), 30% (Group II), 32% (Group III), 34% (Group IV), 36% (Group V) and 38% (Group VI), respectively. The digestibilities of key nutrients were determined on Day 14 after initiating the experiment and the last 3 days. From the beginning of the study, body weight and feed intake were weighed and recorded every other week in order to calculate the average daily bodyweight gain and the feed efficiency. The trial had demonstrated that nitrogen intake was greatly significantly different, which was affected by dietary protein levels (p < 0.001). Growth performance of minks was impaired when dietary protein level was at 28%. When dietary protein level was at 34%, minks had the best daily gains, feed efficiency, and digestibilities of some key nutrients.     

The Dynamic of Maternal Antibody Against Enteritis Virus in Newborn Minks and Immune Efficacy of the Subunit Vaccine

The purpose of this study was to investigate the dynamic of mink enteritis virus (MEV) maternal antibody and the immune effects of subunit vaccines.The offspring of immunized female mink were studied,serum of 21,30,45 and 60 days old mink were collected to determine the HI titer of maternal antibody of MEV.25 healthy minks aged 47~52 days were selected to be inoculated with MEV genetic engineering subunit vaccine,and then blood samples were collected 14 d before and after immunization to determine MEV HI titer.The clinical symptoms and the titer of feces HA of mink enteritis virus were observed 14 d after immunization.Dying and surviving minks were euthanized 14 d after challenge,the duodenum,jejunum and ileum were collected for histopathological observation and immunohistochemical detection.The results showed that the MEV HI of the offspring of immunized female mink decreased gradually with the increase of day age,it was higher at 21 d of age,the MEV HI titer of some minks at 45 d was <1:32 and ≤ 1:4 at 60 d.The MEV HI titer of the control mink was not higher than 1:4 on 14 d after the preparation of qualified vaccine,while it was increased to 1:64~1:512 in immune group.Challenge protection tests showed that the immuned minks were 100% resistant to the attack of mink enteritis virus,and there was no abnormality in the mink's mental state,diet and feces,the HA titer of feces matter after challenge was 1:8~1:16.Histopathological and immunohisto-chemical tests showed that MEV genetic engineering subunit vaccine could well prevent the replication of virus in intestinal mucosal epithelial cells and the damage to intestinal epithelial cells.Therefore,the antibody titer was highest at 21 day-old after immunizing female mink,and the prepared vaccine could break through maternal antibody interference and produce high levels of antibodies when it immunized minks at about 50 d of age,and could resist the attack of mink enteritis virus virulent strain.     

红眼白水貂FSHβ和NCOA1基因多态性及其与繁殖性状的相关分析

本研究旨在检测红眼白水貂促卵泡激素β（follicle-stimulating hormone beta subunit,FSHβ）和核受体辅激活蛋白1（nuclear receptor coactivator 1,NCOA1）基因多态性与繁殖性状的关系。采用单链构象多态性（SSCP）和DNA测序相结合的方法检测了红眼白水貂215个个体的单核苷酸多态性,针对红眼白水貂群体的特点建立合适的统计分析模型,利用SAS 9.4统计软件对候选基因进行多态性分析,并采用最小二乘法分析了总产仔数和产活仔数的遗传效应。结果表明,在红眼白水貂FSHβ基因上存在2个多态位点,分别为内含子1处的g.1228G > A突变和外显子2处的g.1866T > C突变;在NCOA1基因上存在1个多态位点,为第6外显子处g.151536T > C突变。在红眼白水貂群体中,FSHβ基因的优势基因为B等位基因,NCOA1基因的优势基因为A等位基因;FSHβ基因g.1228G > A位点的AA和AB基因型个体在总产仔数、产活仔数上均极显著高于BB基因型（P < 0.01）,g.1866T > C位点在总产仔数和产活仔数上呈现BB > AB > AA的趋势;NCOA1基因的AB基因型个体的总产仔数和产活仔数均极显著高于AA基因型（P < 0.01）;g.151536T > C与g.1228G > A的合并基因型对繁殖性状有显著影响（P < 0.05）。因此,可以利用以上突变位点对红眼白水貂的繁殖性状进行标记辅助选择研究。     

抗菌肽对育成期母貂免疫功能及肠组织形态的影响

【目的】天蚕素抗菌肽是一种商品化的阳离子抗菌肽,在水貂体内的研究较少。试验旨在探究抗菌肽对育成期母貂脏器系数、血清及空肠免疫指标、肠组织形态的影响。【方法】选取65日龄体重相近的短毛黑母貂60只,随机分为6组,每组10个重复,每个重复1只,单笼饲养。各组饲粮中分别添加0(对照组)、100、200、300、400和500 mg/kg抗菌肽,预试期1周,正试期8周。饲养试验结束后,每组取6只水貂进行心脏采血,采集内脏器官、十二指肠及空肠样品,并测定血清及空肠免疫指标、肠道组织形态。【结果】与对照组相比,100、300和400 mg/kg抗菌肽组脾脏指数显著升高(P<0.05);各试验组补体C3(C3)、补体C4(C4)和免疫球蛋白M(IgM)含量均显著升高,除200 mg/kg抗菌肽组外的所有试验组免疫球蛋白A(IgA)和免疫球蛋白G(IgG)含量均显著升高(P<0.05);各试验组肿瘤坏死因子(TNF-α)含量均显著降低,100、200、300 mg/kg抗菌肽组分泌型免疫球蛋白(sIgA)、γ干扰素(IFN-γ)及白细胞介素-10(IL-10)含量均显著升高(P<0....     

Single and composite influence of growth-related candidate gene polymorphisms on additive genetic variation of birth weight in charolais beef cattle

The objective of the present experiment work was to evaluate the effect of the inclusion of genomic information on the additive genetic variance of birth weight (BW) of Charolais cattle in Mexico. Variance components and heritability were estimated using four linear models. The first model was the base model (BM) from which single and composite effects of selected single-nucleotide polymorphism (SNP) markers were evaluated (BM1, BM2, and a composite BM3). Genetic markers were included in a regression model and analyzed by stepwise regression against adjusted BW from a panel of growth-related traits candidate gene markers. After two regression rounds, two SNPs (R ²?>?0.02) were chosen to include into the animal models as fixed effects. Growth hormone receptor gene GHR 4.2 and GHR 6.1 SNPs were selected from a panel of 39 SNPs. GHR 4.2 had a negligible effect on BW, whilst GHR6.1, interestingly, explained ～9 % of genetic variance (p?=?0.0877) with an α_G>A?=?0.509. The inclusion of markers in M2 and M3 reduced 19 and 15 % of the additive genetic variance, respectively. Both adjusted significantly better the linear model (LRT?=?p?<?0.01). Results obtained suggest that the previous selection of markers in a candidate gene approach and subsequent inclusion of selected SNPs into animal model might provide a better fit, avoiding the overestimation of genetic variance components and breeding values for BW.     

饲粮粗蛋白质和粗脂肪水平对冬毛期雄性水貂生长性能、营养物质消化率及氮代谢的影响

本试验旨在研究饲粮粗蛋白质(CP)和粗脂肪(EE)水平对冬毛期雄性水貂生长性能、营养物质消化率及氮代谢的影响,以明确冬毛期水貂饲粮CP和EE的适宜水平。试验采用2×3因子试验设计,即2个CP水平(32%和36%)和3个EE水平(10%、20%和30%),共配制6种试验饲粮。选取84只(120±5)日龄健康雄性水貂,随机分成6组,每组14个重复,每个重复1只。预试期7 d,正试期85 d。结果表明:32%CP组水貂平均日增重(ADG)、蛋白质消化率、脂肪消化率、碳水化合物消化率及氮代谢各指标均显著或极显著低于36%CP组(P0.05或P0.01)。30%EE组水貂末重、ADG和氮沉积含量显著或极显著高于10%EE组(P0.05或P0.01);30%EE组水貂平均日采食量、料重比、干物质消化率、蛋白质消化率、碳水化合物消化率、食入氮含量和粪氮排出量显著或极显著低于10%EE组(P0.05或P0.01)。饲粮CP和EE水平对水貂脂肪消化率有显著交互作用(P0.05)。综合以上指标,在本试验条件下,饲粮CP水平为36%、EE水平为20%或30%时,冬毛期水貂可获得较佳的生长性能,且能够提高水貂对蛋白质的利用率。