共查询到8条相似文献，搜索用时 15 毫秒
1.
Study on pig growth hormone gene polymorphisms in western meat-type breeds and Chinese local breeds 总被引：1，自引：0，他引：1
INTRODUCTIONGrowthhormone (GH)isapeptidehormonewhichregulatesgrowthandvariousmetabolicac tivities (Sterle,1 995;Yuan ,1 996) .InjectionsofGHintogrowingpigsincreasedgrowthrateoftheanimalsandthepercentageofmuscle ,andwhilefataccretionwasdecreased (Bonneau ,… 相似文献
2.
三个引进品种母猪泌乳力的比较 总被引：3，自引：0，他引：3
试验选择了大约克、长白、杜洛克三个品种母猪各10头，从泌乳时间、泌乳次数、泌乳量、初生窝重、20日龄窝重等指标来综合分析不同品种的泌乳力。试验结果表明：大约克母猪和长白母猪的泌乳力显著高于杜洛克母猪（P〈0．01），而前二者之间的泌乳力差异不显著（P〉0．05）。 相似文献
3.
微生物发酵床对育肥猪生产性能及猪肉品质的影响 总被引：2，自引：0，他引：2
为研究发酵床养猪对猪肉品质的影响,试验选择28d断奶的杜长大三元杂交仔猪60头,随机分成试验组和对照组,试验组以发酵床饲养,对照组采用常规水泥地面饲养,试验期为125d,试验结束时,每组随机抽样6头猪进行屠宰测定。试验结果:与对照组相比,试验猪日增重和饲料转化效率分别提高了8.49%和6.27%,背膘厚降低6.8%,脂率降低5.37%,腿臀比例增加6.98%,差异均为显著(P<0.05),而眼肌面积,瘦肉率,屠宰率、板油率、骨率及皮率等指标无明显差异(P>0.05),在肉品质方面,试验组猪肉的颜色、pH值、失水率、滴水损失、熟肉率等肉品质指标均有明显的改善(P<0.05)。表明了相对于水泥面饲养,发酵床养猪有明显提高猪的生长性能和猪肉品质的作用。 相似文献
4.
Objective: To determine whether polymorphisms in the genes for coagulation factor. II, V, VII could predispose an individual
to increase risk for coronary artery disease (CAD) and/or myocardial infarction (MI) in Chinese. Methods: We screened coagulation
factor II(G20210A), V(G1691A), VII (R353Q and HVR4) genotype in 374 patients undergoing coronary angiography by polymerase
chain reaction and restriction fragment length polymorphism (PCR-RFLP) assay. Results: The R353Q and HVR4 gemotype of the
factor VII distribution was in accordance with Hardy-Weinberg equilibrium. The frequencies of FVII genotype or allele did
not show statistically significant differences between CAD group and controls or between male and female. The frequencies
of the Q allele and (RQ+QQ) genotype were significantly higher among the CAD patients without myocardial infarction (MI) history
than among those with MI history (P<0.05). However, HVR4 polymorphism was not significantly different within groups. We only find one normal control of factorII
(G20210A) mutation. No coagulation factor V(G1691A) mutation was found in the CAD patients and controls. Conclusion: The factor
II(G20210A), V(G1691A) mutation is absent and may not be a major genetic factor for CAD and/or MI; the Q allele of the R353
Q polymorphism of the factor VII gene may be a protective genetic factor against myocardial infarction in Chinese.
Project (No. 021103166) supported by a grant from the Key Project of Science and Technology Commission of Zhejiang Province,
China 相似文献
5.
研究血管内皮生长因子(VEGF)936*T/C基因多态性与胃癌之间的关系,了解该基因多态性对胃癌生成及发展的影响。采用聚合酶链反应-限制性片段长度多态性(PCR-RFLP)方法检测胃癌患者和健康者外周血的VEGF936*T/C基因型。结果,胃癌患者外周血中VEGF936*T/C基因型或等位基因与健康者相比无差异(精确概率法计算基因型P=0.226;卡方检验等位基因x2=2.934,P=0.087)。Ⅲ、Ⅳ期病理分期患者C/C基因型和C等位基因比例(66.7%和82.0%)明显大于Ⅰ、Ⅱ期(12.9%和1.2%),两者差异有统计学意义(基因型:x2=14.215,P=0.000;等位基因:x2=28.430,P=0.000)。结果表明,VEGF936*C/C基因多态性与胃癌的生成无关,而与胃癌的进展相关。 相似文献
6.
养兔具有投资少、效益高、见效快等优点.本地区的养兔业已初具规模,其品种主要以长毛兔、中国白兔为主.中国白兔具有生长速度缓慢的缺点[1],严重影响养兔业的发展.通过日喂生物饲料占精料百分比不同的饲养试验,得出添加生物饲料之后,家兔生长速度明显加快(p<0.05),当生物饲料占精料2%时效果非常显著(p<0.01),能显著加快家兔生长速度,降低饲料成本,经济效益显著;当大于或小于这一值时效果无明显差异(p>0.05);生物饲料能减轻畜禽异味和粪尿恶臭;对保持畜禽业的持续发展,缓解人畜争粮,生产绿色食品,减少环境污染具有重要意义. 相似文献
7.
肝素治疗胎儿生长受限临床应用探讨 总被引：1，自引：0，他引：1
目的:探讨肝素用于治疗胎儿生长受限(FGR)的临床疗效及安全性。方法:将74例胎儿生长受限患者随机分为3组,分别使用低分子右旋糖酐加复方丹参(对照组)、普通肝素(UFH)、低分子肝素(LMWH)治疗。治疗前、治疗后1周及终止妊娠前,行彩色超声检查,监测胎儿生长情况和脐血流变化,同时监测各项凝血指标,记录新生儿情况并进行随访。结果:(1)UFH组、LMWH组治疗后宫高、胎儿股骨长、头围、腹围增长值均高于对照组,差异有显著性(P<0.05),LMWH组胎儿双顶径增长显著高于对照组(P=0.031)。(2)两肝素组治疗后脐动脉收缩期最大血流速度(S)与舒张末期血流速度(D)的比值(S/D比值)、搏动指数(PI)、阻力指数(RI)与对照组比较均明显降低,差异有统计学意义(P<0.05),而两肝素组间比较无统计学差异(P>0.05)。(3)UFH组、LMWH组治疗后新生儿胎龄、出生体重、身长、胎盘重量均较对照组明显增加(P<0.05),而两肝素组间无显著差异(P>0.05);新生儿窒息、胎死宫内、新生儿死亡发生率、早产发生率和新生儿畸形发生情况各组间无统计学差异(P>0.05);对照组足月小样儿发生率明显高于两肝素组(P=0.005),而肝素组之间则无显著差异(P>0.05)。对照组与LMWH相比,新生儿转重症监护病房(NICU)几率明显升高(P=0.003)。(4)各组孕妇治疗前后各项凝血功能检测值比较,差异均无显著性(P>0.05),产后出血量及产后出血发生率相比差异亦无统计学意义。结论:肝素可改善胎盘血流,使胎儿体重增加,减少足月小样儿的发生率,且不增加产后出血发生机会,对母亲及胎儿都较安全。LWMH治疗FGR,新生儿转NICU几率明显低于对照组,效果优于普通肝素,且使用方便,产妇易于接受,更适于推广。 相似文献
8.
Objective： To detect the infection frequencies of different genotypes of Epstein-Barr virus （EBV） in subgingival samples from chronic periodontitis （CP） patients, and to discuss the correlation between infection with EBV and clinical parameters. Methods： Nested-PCR assay was used to detect EBV-1 and EBV-2 in subgingival samples from 65 CP patients, 65 gingivitis patients and 24 periodontally healthy individuals. The amplicons were further identified by restriction fragment length polymorphism analysis （RFLP） with endonucleases Afa I and Stu I. Clinical parameters mainly included bleeding on probing （BOP）, probing depth （PD）, attachment loss （AL） in six sites of the dentition. Results： In CP patients, gingivitis and periodontally healthy individuals, the infection frequencies were 47.7%, 24.6% and 16.7% for EBV-1, and 15.4%, 7.7% and 0% for EBV-2, respectively. In 2 out of the 65 CP patients co-infection of EBV-1 and EBV-2 was found. The positive rate of EBV-1 in chronic periodontitis patients was higher than that in gingivitis patients （P=-0.01） and periodontally healthy individuals （P=-0.01）. But no significant difference was shown in EBV-1 frequency between gingivitis patients and healthy individuals （P〉0.05） or in EBV-2 frequency among the three groups （P〉0.05）. In CP patients, higher mean BOP value was found in EBV-1 or EBV-2 positive patients than that in EBV negative ones （P〈0.01）, but with no statistical difference in the mean PD or AL value between EBV positive and negative patients （P〉0.05）. After initial periodontal treatment, 12 out of the 21 EBV-1 positive CP patients did not show detectable EBV-1 in subgingival samples. Conclusion： nPCR plus RFLP analysis is a sensitive, specific and stable method to detect EBV-1 and EBV-2 in subgingival samples. Subgingival infection with EBV-1 is closely associated with chronic periodontitis. Infection of EBV in subgingival samples was correlated with BOP. 相似文献