枫泾和长白母猪对初情期前注射黄体素释放激素类似物(LRH-A_2)的反应     

王瑞祥  蔡正华  焦淑贤  赵尚吉  廖述人 《畜牧兽医学报》1991,(2)

进行两个试验,研究了初情期前不同日龄的枫泾和长白母猪LRH-A_2诱导的LH水平和不同剂量的LRH-A_2对LH水平的影响。结果表明,77日龄枫泾猪,85和202日龄长白猪在诱导前血清中LH含量分别为1.70±0.17、0.74±0.10和1.40±0.14ng/ml,前二者和后二者间的差异极为明显(P<0.001)。除枫泾猪的5μg和10μg剂量外,其余各剂量在注射5分钟后血清中LH含量均显著高于注射前的LH值(P<0.005～0.001)。枫泾猪诱导的LH峰值与LRH-A_2的剂量无关,而长白猪的峰值出现时间和峰值高低均因剂量而异。诱导的LH值随初情期前的小母猪日龄而变化。枫泾猪和长白猪诱导的LH峰值出现的日龄分别为30和60天,峰值分别为5.55±0.63和16.14±2.74ng/ml,差异极明显(P<0.005)。枫泾猪在30～60和75～90日龄时诱导的LH值分别显著低于长白猪在60和95日龄的诱导值,但接近初情期时,两猪种间的差异则变得不明显。可结论如下:甾体激素的负反馈机制,枫泾和长白猪分别在30和60日龄开始建立,并在初情期时达到完善。  相似文献   

利用HCG放射免疫测试药盒测定牛血浆LH含量     

杨利国  谢成侠 《南京农业大学学报》1987,(2)

利用人绒毛膜促性腺激素(HCG)双抗体放免药盒直接检测牛血浆促黄体素(bLH)含量,毋需制备受体,仅将说明书介绍的方法略加修改,就可经济、简便地进行测定。用该法测定无情黄牛血浆LH含量为2.3568±1.3570毫微克/毫升(n=11),发情周期第16—17天的母水牛血浆LH含量为3.3283±1.4963毫微克/毫升(n=8)。黄牛注射三合激素、孕马血清促性腺激素(PMSG)和PMSG与三合激素联用后第6小时,血浆LH含量均较处理前显著增高(P<0.05),分别达11.6800±8.6368(n=3),7.1481±5.5316(n=6)和5.4270±4.4053毫微克/毫升(n=4)。水牛注射PMSG后第24小时和48小时,血浆LH含量分别为6.1940±3.3377和5.5483±2.6501毫微克/毫升(n=4)。  相似文献   

Subclinical, chronic intramammary infection lowers steroid concentrations and gene expression in bovine preovulatory follicles   总被引：1，自引：0，他引：1  

Lavon Y  Leitner G  Klipper E  Moallem U  Meidan R  Wolfenson D 《Domestic animal endocrinology》2011,41(2):98-109

Various doses of estradiol-17β (E₂) were used in heifers to induce a pulse of 13,14-dihydro-15-keto-prostaglandin F_2α (PGFM). The effect of E₂ concentration on the prominence of PGFM pulses and the relationship between prominence and intrapulse concentration of progesterone (P₄), LH, and luteal blood flow were studied. A single dose of 0 (vehicle), 0.01, 0.05, or 0.1 mg of E₂ was given (n = six/group) 14 d after ovulation. Blood samples were collected, and luteal blood flow was evaluated hourly for 10 h after the treatment. The 0.05-mg dose increased and the 0.1-mg dose further increased the prominence of the induced PGFM pulse, compared with the 0.0-mg dose and the 0.01-mg dose. The PGFM pulses were subdivided into three different prominence categories (<50, 50 to 150, and >150 pg/mL at the peak). In the 50 to 150 category, P₄ concentration increased (P < 0.05) between −2 h and 0 h (0 h = peak of PGFM pulse). In the >150 category, P₄ decreased (P < 0.05) between −1 h and 0 h, LH increased (P < 0.05) at 1 h, and luteal blood flow apparently decreased (P < 0.05) at 2 h of the PGFM pulse. The novel results supported the following hypotheses: (1) an increase in E₂ concentration increases the prominence of a PGFM pulse, and (2) greater prominence of a PGFM pulse is associated with a greater transient intrapulse depression of P₄ at the peak of the PGFM pulse. In addition, the extent of the effect of prostaglandin F_2α on the increase in LH and changes in blood flow within the hours of a PGFM pulse was related positively to the prominence of the PGFM pulse.  相似文献   

Effect of luteinizing hormone oscillations on progesterone concentrations based on treatment with a gonadotropin-releasing hormone antagonist in heifers     

Ginther OJ  Fuenzalida MJ  Pugliesi G  Hannan MA  Beg MA 《Domestic animal endocrinology》2011,40(2):119-127

Close temporality has been reported between the episodic secretion of luteinizing hormone (LH) and progesterone (P4) during the midluteal phase and preceding the beginning of luteolysis in cattle. In the present studies, the relationship between LH and P4 was examined by blocking LH oscillations with the gonadotropin-releasing hormone (GnRH) antagonist, acyline. In a titration study, the minimal single acyline dose for blocking LH oscillations in heifers was 3 μg/kg. The main experiment compared LH and P4 concentrations and oscillations between a group treated with acyline on day 15 after ovulation (n = 8) and a control group (n = 4). Concentrations of P4 in blood samples collected every 8 h on days 13 to 18 indicated that acyline treatment did not alter the time that luteolysis began or the length of the luteolytic process. In blood samples collected every hour for 24 h beginning at the hour of treatment, acyline reduced the LH concentrations and blocked LH oscillations. The hourly LH means were 0.06 to 0.08 ng/mL, comparable to the mean concentration at the nadirs of LH oscillations in controls (0.07 ng/mL). During the hourly sampling, the GnRH antagonist produced the following P4 responses: (1) lower P4 concentrations, (2) fewer and reduced prominence of P4 oscillations, and (3) increased length and variability in the interval between the peaks of P4 oscillations. Results indicated that LH oscillations affect both the prominence and the rhythmicity of P4 oscillations during preluteolysis but not the onset and length of luteolysis.  相似文献   

GnRH脉冲对体外原代培养大鼠GTH细胞中FSHβ mRNA表达水平的影响   总被引：3，自引：0，他引：3  

王新  谭建华  赖小平  万忠海  韦旭斌 《动物医学进展》2011,32(4):55-58

为了从分子水平阐述不同脉冲频率促性腺激素释放激素(GnRH)对促性腺激素(GTH)分泌促卵泡素(FSH)的影响,采用细胞体外培养技术结合荧光定量PCR技术,研究体外培养大鼠原代垂体细胞在不同脉冲频率GnRH刺激下,细胞FSHβ mRNA的变化.在相同振幅条件下,低频刺激(120 min间隔)时,FSHβ mRNA表达水...  相似文献   

促性腺激素对猪卵母细胞体外成熟的影响   总被引：8，自引：0，他引：8  

卢晟盛  卢克焕 《西南大学学报(自然科学版)》2004,26(6):769-772

在成熟液中同时添加不同浓度(0.25～2.0μg/mL)FSH和不同浓度(0.25～2.0μg/mL)LH,探讨这2种促性腺激素结合使用对猪卵母细胞体外成熟的影响。结果显示,当FSH的添加浓度为0.25～2.0μg/mL及LH的添加浓度为0.25～2.0μg/mL时,猪卵母细胞的核成熟率极显著高于没有添加FSH和LH的对照组(P<0.01),而FSH和LH不同浓度组合之间对猪卵母细胞核成熟影响差异不显著(P>0.05)。结果表明,成熟液中同时添加0.25μg/mLFSH和0.25μg/mLLH便能极显著地促进猪卵母细胞的核成熟率,国产FSH和LH用于猪卵母细胞体外成熟研究是可行的。  相似文献   

重离子束辐照、激素FSH/LH及丙酮酸钠对绵羊卵母细胞体外成熟的影响     

常卫华  张勇  王燕玲  张红  徐鹏  吴海凤 《核农学报》2011,25(2):391-396

研究不同剂量重离子束辐照、FSH与LH的配比及添加不同浓度丙酮酸钠对绵羊卵母细胞体外成熟(in vitro maturation,IVM)的影响.结果显示1.0和1.5Gy辐照可以明显提高绵羊卵母细胞ⅣM;成熟液中添加10μg/ml FSH与10μg/ml LH(1:1,即Ⅱ组)时其IVM最高,显著高于Ⅰ组(1:2)、...  相似文献   

成年公兔血清FSH、LH和T水平的研究     

吴金节  章孝荣  凌英济  陶勇  李云 《安徽农业大学学报》2000,27(4):388-390

通过外科手术连续收集活体公兔外周血样 ,用放射免疫法测定血清促卵泡素 ( FSH)、促黄体生成素 ( LH)和睾酮 ( T)水平。 5只健康成年公兔分别安置颈静脉导管 ,以 2 0 min间隔连续采样 1 0次。结果表明 ,血清 FSH、LH和 T含量分别为 ( 2 4 4.95± 4 5.4 9) IU/ L、( 443.64± 1 88.4 4) IU/ L和 ( 1 32 .4 6± 99.2 4 ) nmol/L;LH和 T均呈波动式释放 ,而 FSH的波动性不明显  相似文献   

胰岛素对初情期前母猪垂体细胞促性腺激素释放及生长激素分泌的影响     

刘立文  刘海斌  李元军  王平  周虚 《安徽农业科学》2008,36(5):1882-1884

[目的]探讨胰岛素对猪垂体前叶细胞无血清单层培养细胞分泌促卵泡素(FSH)、促黄体素(LH)、生长激素(CH)的影响。[方法]24头140日龄、体重17 kg的母猪被分成高、中、低3个能量组,利用无血清单层培养垂体模型,并用放射免疫法测定细胞液促卵泡素、促黄体素和生长激素浓度。[结果]在不同能量水平上,胰岛素对单层无血清培养垂体细胞FSH、LH及GH释放能力的影响有显著差异(P<0.05),高能组较高,低能组较低。[结论]首次研究了在初情期前母猪体外培养垂体细胞中添加胰岛素对垂体细胞分泌激素的影响,证实代谢激素在初情期前母猪下丘脑-垂体-卵巢水平上调节生殖机能。  相似文献   

抑制素A对牦牛颗粒细胞FSH、LH及其受体表达的影响     

王立斌  王军乾  赵凌  黄振华  王萌  王靖雷  余四九  潘阳阳 《核农学报》2023,37(1):51-59

为了探明抑制素A(INHA)对牦牛卵泡颗粒细胞中促卵泡素(FSH)和促黄体素(LH)与其受体结合发挥的作用,通过体外培养牦牛卵泡颗粒细胞,采用免疫荧光技术(IF)检测促卵泡素受体(FSHR)和促黄体素受体(LHR)在颗粒细胞中的分布情况,用不同浓度外源性INHA(0、1.25、2.5、5、10、20 ng·mL^-1)作用12 h后,利用实时荧光定量PCR(qRT-PCR)技术检测颗粒细胞中FSHβ、LHβ、FSHR、LHR基因的表达情况,采用酶联免疫分析试验(ELISA)检测细胞内外FSH、LH的含量。结果显示,FSHR和LHR在颗粒细胞质与细胞核中均有表达。FSHβ和LHβ基因在颗粒细胞中的表达随INHA浓度的增大呈先降后升的趋势;INHA浓度接近5 ng·mL^-1时,FSHβ表达最低;INHA浓度接近10 ng·mL^-1时,LHβ表达最低;FSHR和LHR基因的表达与INHA浓度呈负相关。INHA浓度接近5 ng·mL^-1时,颗粒细胞内外FSH含量最低;INHA浓度接近10 ng·mL^...  相似文献