共查询到20条相似文献,搜索用时 46 毫秒
1.
2.
北京油鸡和矮脚鸡心脏型、脂肪型脂肪酸结合蛋白基因多态性的研究 总被引:18,自引:1,他引:18
根据不同物种间同一基因核苷酸序列的保守性及相似性,设计特异性引物,利用聚合酶链式反应技术(PCR),扩增鸡心脏型脂肪酸结合蛋白(H—FABP)基因第二内含子序列;根据已经发表的鸡脂肪型脂肪酸结合蛋白(A-FABP)基因mRNA序列,设计特异性引物,扩增鸡A-FABP基因第三内含子序列。选用Hha Ⅰ、Hae Ⅲ、Hinf Ⅰ、BamH Ⅰ、EcoR Ⅰ、Pst Ⅰ、Xmn Ⅰ和Hind Ⅲ8种限制性内切酶对扩增产物分别进行单酶切,发现H—FABP基因第二内含子Hha Ⅰ PCR—RFLP及A-FABP基因第三内含子Hinf Ⅰ PCR—RFLP。 相似文献
3.
为了检测MyoG基因和A-FABP基因单核苷酸多态性(SNP)与鹅肉品质性状的相关性,以太湖鹅为研究对象,测定肌内脂肪含量和相关组织学指标特性,利用PCR—SSCP和测序技术研究MyoG基因外显子1和A—FABP基因内含子2SNPs,并进行相关分析。研究结果表明:(1)MyoG基因外显子1扩增序列大小为420bp,共有1个突变,突变位点在64bp处,为C—T突变,不同基因型之间肌纤维密度、直径差异显著(P〈0.05);(2)A—FABP基因扩增序列大小为482bp,共发现3个突变位点,在第187bp处发生C—T突变,在第235bp处发生C—A突变,在第372bp处发生A—C突变;(3)A—FABP基因内含子2扩增产物经SSCP分析后发现两种基因型,不同基因型之间脂肪含量有一定差异。比对发现其与家鸭同源性达91%,与家鸡的同源性为85%。本研究结果为进一步分析MyoG和A—FABP基因的遗传变异及其与肉质性状的相关性以及将该分子标记应用于育种计划奠定一定的理论基础。 相似文献
4.
对藏绵羊生长激素释放激素(GHRH)基因内含子Ⅱ部分序列进行了PCR扩增和测序,用Genbank中的Blastn方法与普通牛相应基因序列进行了比对分析。结果表明,藏绵羊与普通牛GHRH基因内含子Ⅱ部分序列间同源性为92%;2个物种该基因内含子Ⅱ部分序列间的碱基变异类型主要表现为碱基转换和颠换,亦存在碱基插入和缺失。 相似文献
5.
6.
7.
采用PCR技术从藏系绵羊皮肤组织细胞中扩增出了血管内皮细胞生长因子(VEGF)基因,长度为573 bp,共编码190个氨基酸;序列比对发现,VEGF基因在所选择的多个物种之间具有高度同源性,相似性在100%~74.5%之间,其中藏系绵羊与普通绵羊的VEGF基因序列完全相同,其次为牛和猪,相似性分别为99.1%和96.2%,而与鸡的同源性最低,相似性为74.5%。采用实时荧光定量PCR SYBR Green I荧光染料法,对藏系绵羊皮肤组织细胞中VEGF基因的表达水平进行了相对定量分析,建立了快速检测VEGF基因表达量的方法。检测结果表明:给妊娠后期藏系母羊补饲自制的营养舔砖和颗粒饲料后,所产羔羊体内VEGF基因的表达水平分别为对照组的11.5倍和0.85倍。为提高羔羊皮肤组织中VEGF基因mRNA的表达水平,对妊娠后期藏系母羊补饲自制的营养舔砖,效果优于补饲颗粒饲料。 相似文献
8.
9.
10.
从雌性绵羊输卵管、子宫体、子宫颈、阴道组织中提取总RNA,根据已获得的绵羊ghrelin基因cDNA序列设计特异性引物,采用RT—PCR方法扩增出了绵羊ghrelin基因;将扩增产物克隆于pMD19-T载体后进行测序。以β-肌动蛋白(β-actin)基因作为内参,采用半定量RT—PCR法扩增ghrelin基因,经琼脂糖凝胶电泳后,应用凝胶成像分析系统计算雌性绵羊不同生殖道组织中ghrelin基因的表达量。结果显示,从雌性绵羊生殖道各组织均扩增出了233bp的ghrelin基因片段;ghrelin基因在子宫体的表达量最高,输卵管内次之,子宫颈和阴道内最低。表明,ghrelin对雌性绵羊生殖系统的调节及生殖激素的分泌等具有重要作用。 相似文献
11.
12.
魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
13.
14.
本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
15.
REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献
16.
17.
18.
Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF
Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo. 相似文献
19.
乳酸杆菌作为益生菌广泛用于人和动物.本文综述了乳酸杆菌改善宿主健康的机制.乳酸杆菌可通过产生抗菌物质如乳酸、过氧化氢、细菌素,或者通过竞争营养或肠道黏附位点来抑制致病菌;通过诱导黏附素的分泌或阻止细胞凋亡而增强肠道的屏障功能,从而保护肠道.文章重点讨论了乳酸杆菌表面成分(表面蛋白、脂磷壁酸和肽聚糖)与肠道受体(C型凝集素受体、Toll样受体和Nod样受体),阐述了他们结合后启动免疫调节信号,调控肠道免疫功能以发挥改善健康作用的机制. 相似文献