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为研究牦牛胰岛素样生长因子1受体基因(IGF-IR)的结构和功能,采用同源克隆和RT-PCR方法分段扩增牦牛IGF-IR,拼接获得全长序列,利用生物学软件进行分析。结果表明,牦牛IGF-IR基因ORF长约4 104 bp,编码1 367个氨基酸;理论分子量约154. 95 ku,等电点p I值约5. 71。与黄牛IGF-IR比较,牦牛IGF-IR基因序列有20处碱基改变,其中G到T碱基颠换2次,G到A碱基转换2次,C到T碱基转换7次,A到G碱基转换3次,T到C碱基转换6次,以及3个位点氨基酸改变(G6R、T29I和S30I)。系统进化分析表明,牦牛与黄牛、猪、人、狗、小鼠、猩猩等物种IGF-IR氨基酸相似性均大于92%,处于同一进化分支,具有高度同源性。蛋白结构预测表明,牦牛IGF-IR包含半胱氨酸富集区(FU)、纤连蛋白Ⅲ型结构域(FN3)、跨膜结构域(TM)及酪氨酸蛋白激酶区(Tyr Kc),具有该受体家族的特征结构域。同源建模表明,其成熟区段氨基酸序列与人的IGF-IR有98. 68%的相似性。为后续牦牛IGF-IR基因的功能研究奠定了基础。 相似文献
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以3岁的盘羊与欧拉羊杂交一代、欧拉羊为对象,研究杂交效果的优劣并进行评价。选择10只羊进行屠宰试验,检测其屠宰性能和肉品质;使用仪器测定其氨基酸、脂肪酸及风味成分。结果表明,盘羊×欧拉型杂交F1宰前活质量与欧拉型藏羊差异显著,胴体质量、屠宰率、眼肌面积差异不显著;盘羊×欧拉型杂交F1的GR值、失水率和熟肉率略优于欧拉型藏羊;组氨酸和半胱氨酸含量差异显著,其余氨基酸含量差异不显著;盘羊×欧拉型杂交F1的单不饱和脂肪酸及多不饱和脂肪酸含量均高于欧拉型藏羊;两者检测均发现34种风味物质,含量差异不大。综上,盘羊×欧拉型杂交F1在屠宰性能、肉品质、脂肪酸成分及构成比例等方面都表现出良好的肉品品质。 相似文献
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一、标准现状 (一)皮毛绒资源 我国动物毛皮资源丰富,分布广泛,种类繁多。毛纤维主要有绵羊毛、山羊毛、山羊绒、牦牛毛、牦牛绒、骆驼毛、骆驼绒、兔毛、马海毛及特种用途毛等。皮主要有绵羊皮、山羊皮、牛皮、猪皮、马皮、驴皮、鹿皮及羔、裘皮等。据统计:1999年我国绵羊 相似文献
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[Objective] This study was to clone Lfcin gene from Datong yak, so as to provide reference for applying this gene in feed industry and breeding industry. [Method] Using PCR technology, the lactoferricin(Lfcin)-encoding gene was obtained from genome of Datong yak; then it was cloned into pGEM-T easy vector, and then sequenced; the sequencing results were subsequently aligned with the sequences of dairy cow accessed in GenBank. Moreover, amino acid sequences of Lfcin gene from various species including yak, dairy cow, human and mouse were used for sequence alignment and phylogenesis analysis. [Result] The second exon of lactoferrin(LF) from Datong yak, which is 778 bp in length, was obtained, within which the coding region of Lfcin gene is 75 bp (25 amino acid residues); sequence analysis showed that there is discrepancy of eleven bases between Datong yak and dairy cow; Lfcin proteins from various species shared high homeology, of which that from Datong yak and dairy cow were completely identical; phylogenesis analysis showed that cladogram based on Lfcin was consistent with species evolutionary law. [Conclusion] This study laid a foundation for the prokaryotic or eukaryotic expression of Lfcin gene and further understanding the activity of Lfcin protein. 相似文献
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青海大通牦牛肌间脂肪酸组成分析(英文) 总被引:1,自引:0,他引:1
[Objective] The study aimed to provide a theoretical basis for rational utilization of Datong yak resource. [Method] By qualitative and quantitative determination with gas chromatograph, the composition and content of intermuscular fatty acid of Datong yak were compared with those of Datong yellow cattle. [Result] Comparing with Datong yellow cattle, Datong yak had lower saturated fatty acid (SFA) content and higher polyunsaturated fatty acid (PUFA) content at extremely significant level (P<0.01), while the difference of monounsaturated fatty acid (MUFA) contents between them was not significant (P>0.05). The PUFA/SFA and n-6/n-3 PUFA of Datong yak were in accordance with the recommended proportions. [Conclusion] The intermuscular fatty acid composition of Datong yak is superior to that of local yellow cattle, which indicates that Datong yak meat has high nutritive value and wide development prospect. 相似文献
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3 2 与羊肉主要贸易国羊肉质量评价标准对比国外对羊肉质量评价标准 ,不同的国家和地区 ,标准差异较大。目前国内外羊肉质量评价标准主要是 :羊肉感官指标 (包括色泽、粘度、弹性、气味、肉汤状态等 ) ,理化指标 (挥发性盐基氮及汞等 ) ,卫生指标及胴体羊肉分级标准。在这些指标中 ,我国羊肉的感官指标、理化指标、卫生指标与国外相比 ,差异不大 ;而胴体羊肉分级标准则各国不同 ,差异比较见表 3 ,从表 3看出 ,澳大利亚和新西兰作为世界羊肉生产大国 ,其羊肉分级标准基本相同 ,均根据胴体重和脂肪含量进行分级 ;美国则分别规定了羔羊肉、周… 相似文献
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牦牛IGF2内含子的遗传多态性及其遗传效应分析 总被引:1,自引:0,他引:1
采用PCR-SSCP方法检测牦牛胰岛素样生长因子2(Insulin like growth factor2,IGF2)基因内含子2,7,8的多态性,并分析其对体重、体高、胸围和体斜长的遗传效应.用BioEdit软件对牛、羊、人、猪等相关序列同源性比对以后,主要依据牛(NW-001494548)DNA序列设计3对引物.结果在intron7和intron8引物扩增的片段上发现多态性,并对纯合子进行测序,发现intron7引物扩增片段91位存在C→T转换,intron8引物扩增片段存在330位G→C和358位A→G转换,且在该两对引物扩增产物均检测到3种基因型(AA、AB、BB).统计结果表明,intron7的3种基因型在大通牦牛、青海高原牦牛和新疆巴州牦牛群体中的分布处于平衡状态,而在甘南牦牛和天祝白牦牛群体中则处于极端不平衡状态.intron8的3种基因型仅在新疆牦牛群体中处于不平衡状态,最小二乘分析结果表明,AA和AB基因型同BB基因型相比有较大体重(P<0.01),但在体高、体长和胸围性状上AA与BB基因型均不显著,说明IGF2基因有不赖于骨骼增长而增加体重的作用机制. 相似文献