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同源GnRH对无血清培养鸡卵泡颗粒细胞孕酮分泌的作用 总被引：5，自引：1，他引：4
选用产蛋规律的鸡，在一个产蛋序列中，排卵前１～３ｈ剖腹收集各级卵泡，分离颗粒层建立卵泡颗粒细胞无血清单层贴壁培养模型。在此基础上，用不同剂量鸡促性腺激素释放激素（ＧｎＲＨ－Ⅱ）单独处理或与羊ＬＨ（ｏＬＨ）协同处理，并使用ＧｎＲＨ－Ａｎｔａｇｏｎｉｓｔ（ＧＡ），以观察ＧｎＲＨ－Ⅱ对颗粒细胞孕酮分泌的影响。研究获得了以下结果：（１）ＧｎＲＨ－Ⅱ对鸡不同卵抱（Ｆ１、Ｆ３、Ｆ５）颗粒细胞孕酮分泌均有促进作用，并呈现剂量－反应关系；（２）ＧｎＲＨ－对ｏＬＨ促鸡卵泡颗粒细胞孕酮的分泌有明显的协同作用；（３）ＧｎＲＨ拮抗物使ＧｎＲＨ－Ⅱ的促卵泡颗粒细胞孕酮分泌作用受到阻断。 相似文献
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采用肉眼观察法测定有关药物对日本血吸虫运动性的影响。结果表明：（１）１０－３,１０－４,１０－５ｍｏｌ／Ｌγ－氨基丁酸（ＧＡＢＡ）均有兴奋虫体的作用,其兴奋性随浓度递增而增强;（２）用１０－３、１０－４ｍｏｌ／Ｌ巴氯酚（ｂａｃｌｏｆｅｎ）、毕扣扣林（ｂｉｃｕｃｕｌｉｎｅ）和印防己毒素（ｐｉｃｒｏｔｏｘｉｎ）作用虫体后,巴氯酚、毕扣扣林在浓度为１０－３ｍｏｌ／Ｌ时对虫体有明显抑制作用,浓度为１０－４ｍｏｌ／Ｌ时抑制作用不明显;而１０－３、１０－４ｍｏｌ／Ｌ印防己毒素均表现一定的兴奋作用;（３）先用１０－３ｍｏｌ／ＬＧＡＢＡ兴奋虫体后,再加入上述药物,结果仍是相同。表明一定浓度的巴氯酚,毕扣扣林不仅对内源性的ＧＡＢＡ有拮抗作用,而且对外源性的ＧＡＢＡ有拮抗性;而印防己毒素不仅无拮抗性,还有协同ＧＡＢＡ的兴奋作用。初步判定,ＧＡＢＡ为日本血吸虫的一种兴奋性神经递质,有别于其它寄生虫（如曼氏血吸虫和鸡蛔虫）。 相似文献
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用三种不同鸡传染性法氏囊病强毒株,对ＢＷＥＬ－ＳＰＦ鸡群１－１０个家系３周龄鸡进行敏感性试验,观察比较鸡群各家系对不同敏感性,测定不同毒株的毒价。广西强毒株（ＩＢＤＶ－ＧＸ株）〈ＬＤ５０为１０＾５．０／０．２ｍｌ;湖南强毒株,ＬＤ５０为１０＾５．２／０．２ｍｌ;吉林强毒株（ＩＢＤＶ－ＪＬ株）,ＬＤ５０为１０＾５．５／０．２ｍｍｌ,以１００ＬＤ５０攻毒剂量,对ＢＷＥＬ－ＳＰＦ鸡１￣１０家系的致死率为 相似文献
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牦牛卵泡液LDH同工酶及外源性激素对其表达模式的影响 总被引：1，自引：0，他引：1
采用比色法和不连续缓冲系统的聚丙烯酰胺凝胶电泳（ＰＡＧＥ）技术对未孕和怀孕初期牦牛卵泡液乳酸脱氢酶（ＬＤＨ）活性及同工酶进行了测定，并分析了促卵泡素３号（ＬＲＨ－Ａ３）、人绒毛膜促性腺激素（ｈＣＧ）和孕马血清促性腺激素（ＰＭＳＧ）对其表达模式的影响。结果表明，未孕和怀孕初期牦牛卵泡液ＬＤＨ活性分别为２００．４±３１．１，２１５．３±８６．６μｍｏｌ·ｓ－１·Ｌ－１，同工酶有５条谱带。３种外源性激素均使牦牛卵泡液ＬＤＨ活性显著升高（Ｐ＜０．０１），ＬＤＨ同工酶带型分布发生变化，降低了ＬＤＨ２／ＬＤＨ１比值，改变了同工酶中Ａ和Ｂ亚基所占比例 相似文献
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鸡肝脏β—羟—β—甲戊二酸单酰辅酶A还原酶的提纯和性质 总被引：5，自引：0，他引：5
采用超速离心、热变性处理、硫酸铵沉淀和亲和层析方法，从鸡肝脏中分离提纯了β－羟－β－甲戊二酸单酰辅酶Ａ（ＨＭＧ－ＣｏＡ）还原酶。提纯倍数为２０９倍，比活力１８８．５Ｕ／ｍｇ，Ｋｍ值１．８×１０－４ｍｏｌ／Ｌ。ＳＤＳ－ＰＡＧＥ测得分子量为３．２×１０４。温度对该酶活性影响较大，３７℃时活性最高。最适反应ｐＨ为７．２。甘氨酸在１０ｍｍｏｌ／Ｌ浓度以上时对该酶呈现明显抑制作用，ｌ－组氨酸、ｌ－精氨酸则无明显抑制作用。Ｚｎ２＋、Ｍｇ２＋、Ｃｕ２＋离子对该酶有明显抑制作用，Ｚｎ２＋在１．５ｍｍｏｌ／Ｌ、Ｃｕ２＋和Ｍｇ２＋在２．０ｍｍｏｌ／Ｌ浓度以上时抑制作用明显。中药山楂（ＣＨＳ）和决明子（ＣＨＺ）的水煎液对酶的抑制作用明显 相似文献
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用含Ｆｅ＾３＋０．００、１．３４×１０＾－３、１．３４×１０＾－２ｍｏｌ／Ｌ的溶液处理卵泡细胞及垂体细胞的培养液，观察不同Ｆｅ＾３＋水平对离体卵泡细胞分泌雌二醇和孕酮的影响。结果表明，不同水平的Ｆｅ＾３＋显著抑制了离体卵泡细胞分泌雌二醇和孕酮（Ｐ〈０．０５）。 相似文献
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本研究从萆艹解中分离出一种白色针状结晶，经薄层层析和熔点测定鉴定为薯蓣皂甙。取３００ ｇ 萆解粉，８００ ｍ Ｌ／ Ｌ 乙醇回流３ 次，每次３ ｈ，过滤后滤液减压浓缩至干，按每克萆艹解 粉加７ ｍ Ｌ蒸馏水制成皂甙水剂，比色法测定薯蓣皂甙含量为４．７８５７ ｇ／ Ｌ，将 ３０ 只痛风鸡随机分成 ３组，第Ⅰ组１０ 只为对照；第Ⅱ组１０ 只每日用肾肿清按１０ ｇ／ｋｇ 的比例拌料饲喂；第Ⅲ组１０ 只每日饮水中添加５２．５ ｍ Ｌ 皂甙水剂。每间隔３ ｄ 颈静脉采血３～５ ｍ Ｌ／只，分别测定血液尿酸、血清钙、血清磷的含量。观察临床症状，在试验第３４ ｄ 扑杀所有鸡进行病理学检查。结果表明，第Ⅱ、Ⅲ组血液尿酸含量与第Ⅰ组相比明显降低，差异显著（ Ｐ＜ ０．０５）；第Ⅱ、Ⅲ组血清钙和血清磷含量与第Ⅰ组相比差异不显著（ Ｐ＞ ０．０５）；第Ⅱ组血液尿酸、血清钙和血清磷含量与第Ⅲ组相比差异不显著（ Ｐ＞ ０．０５）。第Ⅱ组、第Ⅲ组治愈率分别为６０％ 、８０％ ． 相似文献
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应用病毒蚀斑技术，将乙型脑炎病毒ＨＷ１株在鸡胚成纤维细胞（ＣＥＦ）单层培养上连续挑斑纯化３次，对纯化后的克隆株进行血清学，免疫生物学鉴定及外源性污染检定。毒株对ＢＨＤ－２１细胞感染滴度≥１０＾６．１５ＴＣＩＤ５０；对８－９ｇ小鼠脑内感染的毒力≥１０＾７．１０ＬＤ５０／０．０４ｍＬ；与ＪＥＶＰ３株阳性参考血清的中和指数≥２０００；克隆株对猪有较好的的性，无外源性污染。 相似文献
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先分离培养小鼠腹腔巨噬细胞,经差速贴壁法纯化后,随机分为6组：空白对照组、0.5mg/L脂多糖（LPS）组、10-6 mol/L孕酮（P4）组、LPS＋10-5 mol/L P4组、LPS＋10-6 mol/L P4组、LPS＋10-7 mol/L P4组。各组在处理12、24h分别提取上清液,ELISA法测TNF-α和IL-1β的含量;各组在处理24h分别提取细胞总RNA,用RT-PCR法测TLR4、CD14、MD2mRNA的表达。结果显示,处理12、24h,0.5mg/L LPS组TNF-α和IL-1β的含量均极显著高于对照组（P〈0.01）;10-6 mol/L P4组与对照组差异不显著（P〉0.05）;LPS＋10-5 mol/L P4组极显著低于对照组（P〈0.01）;LPS＋10-6 mol/L P4组显著低于对照组（P〈0.05）;而LPS＋10-7 mol/L P4组TNF-α的表达差异不显著（P〉0.05）,IL-1β的表达差异显著（P〈0.05）。说明P4可降低LPS刺激小鼠腹腔巨噬细胞TNF-α和IL-1β的分泌,且呈剂量依赖关系。LPS单独处理,TLR4和CD14mRNA的表达极显著高于对照组（P〈0.01）;10-6 mol/L P4单独处理与对照组无显著差异（P〉0.05）;分别添加1-5、10-6、10-7 mol/L P4组均极显著降低LPS诱导TLR4和CD14mRNA的表达（P〈0.01）,而MD2mRNA的表达差异不显著（P〉0.05）。说明P4可极显著降低LPS刺激小鼠腹腔巨噬细胞TLR4和CD14mRNA表达,但对MD2mRNA表达影响不显著。结果显示,P4能抑制LPS刺激的小鼠腹腔巨噬细胞TNF-α和IL-1β的分泌,此过程与细胞TLR4和CD14表达下降相关,而与MD2的表达无关。 相似文献
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Heterosis effects were evaluated in three composite populations in F1, F2, and F3 generations separately and combined in 1-yr-old and from 2- through greater than or equal to 7-yr-old beef cows. Traits included actual weight, weight adjusted to a common condition score, hip height, and condition score. Breed effects were evaluated in the nine parental breeds (Red Poll [R], Hereford [H], Angus [A], Limousin [L], Braunvieh [B], Pinzgauer [P], Gelbvieh [G], Simmental [S], and Charolais [C]) that contributed to the three composite populations (MARC I = 1/4 B, 1/4 C, 1/4 L, 1/8 H, 1/8 A; MARC II = 1/4 G, 1/4 S, 1/4 H, 1/4 A; and MARC III = 1/4 R, 1/4 P, 1/4 H, 1/4 A). Breed group (parental breed and composite) effects were significant for all traits analyzed. The effects of heterosis were generally important (P less than .05) for all traits in F1, F2, and F3 generations separately and combined in the three composite populations. Generally, the magnitude of heterosis observed at 1 yr of age did not differ from that observed in cows from 2 through greater than or equal to 7 yr old. Adjusting weight to a common condition score resulted in an average reduction of heterosis effects on actual weight by approximately one-fourth. Thus, approximately one-fourth of the effects of heterosis on weight result from heterosis effects on condition score. Generally, retained heterosis in the F3 generation of either 1-yr-old or from 2-through greater than or equal to 7-yr-old cows of the three composite populations did not differ (P greater than .05) from expectation based on retained heterozygosity for the traits analyzed. These results support the hypothesis that heterosis for weight, hip height, and condition score of cows of these age classes is the result of dominance effects of genes. 相似文献
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为了优化猪体外受精技术体系,本试验探索了甲基-β-环化糊精(methyl-beta-cyclic dextrin,MBCD)对猪体外受精以及早期胚胎发育的影响。在体外受精0和4 h向受精液(modified Tris-buffered medium,mTBM)中添加不同浓度(0,0.5,1,2,5,10,15,20μmol/mL)的MBCD,受精孵育结束后转至PZM-3培养液中进行胚胎培养。对各处理组卵母细胞的受精情况以及胚胎发育能力进行了系统的检测,并用金霉素(chlortetracycline,CTC)染色法评估了MBCD处理后精子获能状态。结果显示:1)体外受精0 h添加5μmol/mL MBCD组的卵裂率、囊胚率、囊胚细胞数显著高于(P<0.05)对照组和除10μmol/mL MBCD组之外的其他试验组。2)体外受精0 h添加5和10μmol/mL MBCD组、单精入卵率显著高于(P<0.05)对照组和其他试验组,而多精入卵率显著低于(P<0.05)对照组和其他试验组。3)添加5μmol/mL MBCD组,0～1 h,F型精子迅速减少(78.56～19.43),B型精子迅速增加(10.79～69.86);1～4 h,F型精子和B型精子基本保持不变(B型:69.86～78.78,F型:19.43～9.11)。上述结果表明在体外受精0 h向mTBM中加入5μmol/mL MBCD可以显著提高获能精子比例,减少多精受精发生,提高早期胚胎发育潜能。 相似文献
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试验旨在探讨硫化氢供体硫氢化钠改善疲劳状态下肌力减退的作用。采用脉冲式电流直接刺激腓肠肌作为疲劳模型,对比硫氢化钠和任氏液分别对蟾蜍腓肠肌疲劳的影响。结果表明,硫氢化钠在浓度为5×10-4、1×10-3、2×10-3 mol/L时,离体腓肠肌达到最大收缩幅度90%、50%和10%的时间极显著长于在任氏液作用下的离体腓肠肌(P<0.01);5.6 mg/kg硫氢化钠也极显著延长了在体腓肠肌达到最大收缩幅度90%、50%和10%的时间(P <0.01)。表明外源性硫化氢具有延缓肌肉疲劳的作用。 相似文献
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Crossbred weanling piglets (n = 1,920; mean initial BW, 5.3 +/- .7 kg) were used in two 9-wk trials employing a randomized block design in a 2 x 2 factorial arrangement of treatments to determine effects of group size (20 [Small = S] or 100 [Large = L] pigs/pen) and floor-space allowance (calculated requirement [CR] or calculated requirement less 50% of estimated "free space" [CR-50]) on growth performance. Free space was estimated for each group size. From wk 1 through 4 after weaning, S and L groups at CR were allowed a floor space of .17 m2/pig, and at CR-50, S and L groups were allowed .15 m2/pig and .13 m2/pig, respectively. From wk 5 through 9 after weaning, all CR treatment pigs were provided a floor space of .38 m2/pig, and for the CR-50 treatment, S and L pigs were allowed .32 m2/pig and .28 m2/pig, respectively. Piglets had free access to feed and water. Feeder-trough space per pig was the same for both group sizes. Feed-intake data were collected for only wk 1 through 4. Group size by floor-space allowance interactions (P < .05) were found for gain/feed ratio (G/F) for wk 1 and wk 2 through 4, but not for wk 1 through 4. Piglets in L groups were lighter (P < .001) at the end of wk 1, 4, and 9 by 2, 4, and 5%, respectively, and had lower ADG (6%; P < .001) throughout the trial than S piglets. During wk 1 through 4, feed intake was lower (7%, P < .001) in L piglets than in S piglets, but G/F was similar (P > .05). Piglets in CR groups had greater ADG (5%; P < .01) throughout the trial, with a greater G/F (P < .05) for wk 1 through 4, and were heavier (P < .01) than those in CR-50 groups at the end of wk 4 (3%) and 9 (4%). Pigs in L groups had a greater within-pen coefficient of variation in BW at the end of wk 9 than pigs in S groups. Large groups and reduced floor-space allowance reduced piglet growth performance in the nursery. 相似文献
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This study was aimed to explore the expression of BMP2 and BMP4 genes in skin stem cells of Mongolia Cashmere goat with the influence of different concentrations of neuropeptide P (SP).We set five different SP concentrations (0, 1×10-6, 1×10-7, 1×10-8 and 1×10-9 mol/L) to stimulate the skin stem cells, then identified the expression quantities of BMP2 and BMP4 at days of 0, 7, 14 and 21 by Real-time quantitative PCR with the purpose of determining the optimum SP concentration for the differentiation of skin stem cells.The results showed that SP with the concentrations of 1×10-6 and 1 ×10-8 mol/L promoted the expression of BMP2 and BMP4;The expression of BMP2 at 7 and 14 d in SP 1×10-8 mol/L group was significantly higher than that of the SP 1×10-6 mol/L group (P<0.05);The expression of BMP4 in SP 1×10-6 mol/L group had no significant difference with the SP 1×10-8 mol/L group (P>0.05);At 21 d, the expression of BMP2 and BMP4 significantly decreased in SP 1×10-8 and the SP 1×10-6 mol/L groups, and the expression of BMP2 in the SP 1×10-8 mol/L group was significantly higher than that of the 1×10-6 mol/L group (P<0.05), while the expression of BMP4 in the SP 1×10-6 mol/L group had no significant difference with that of SP 1×10-8 mol/L group (P>0.05).The results indicated that the concentrations of 1×10-6 and 1×10-8 mol/L not only might affect the expression of BMP2 and BMP4 of skin stem cells, but also provided a theoretical basis for the directional differentiation of skin stem cells. 相似文献
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本研究旨在探讨不同浓度的神经肽P物质(SP)刺激对内蒙古白绒山羊皮肤干细胞BMP2、BMP4基因表达的影响。本研究分别采用0(对照组)、1×10-6、1×10-7、1×10-8、1×10-9 mol/L 5个浓度梯度的SP对内蒙古白绒山羊皮肤干细胞进行刺激处理,并分别于第0、7、14及21天采用实时荧光定量PCR方法鉴定BMP2和BMP4基因的表达量。结果显示,1×10-6和1×10-8 mol/L的SP促进BMP2、BMP4的表达;在7和14 d时,SP 1×10-8 mol/L组BMP2的表达量显著高于SP 1×10-6 mol/L组(P<0.05),SP 1×10-6 mol/L组BMP4的表达量与SP 1×10-8 mol/L组差异不显著(P>0.05);在21 d时,SP 1×10-8 mol/L、SP 1×10-6 mol/L组BMP2、BMP4的表达量都明显降低,其中SP 1×10-8 mol/L组BMP2的表达量显著高于1×10-6 mol/L组(P<0.05),SP 1×10-6 mol/L组BMP4的表达量与SP 1×10-8 mol/L组差异不显著(P>0.05)。结果表明,SP 1×10-6和1×10-8 mol/L不仅对内蒙古白绒山羊皮肤干细胞BMP2、BMP4基因的表达量有影响,而且为皮肤干细胞的定向分化提供理论基础。 相似文献
18.
添加褪黑素对牛精液品质的影响 总被引：1，自引：1，他引：0
为探讨褪黑素(melatonin,MLT)在牛精液保存中的抗氧化作用,本研究利用目测法、低渗膨胀法和考马斯亮兰染色法分析了不同MLT浓度(0、10-3、10-4和10-5 mol/L)和不同孵育时间(1、4和8 h)对精子活力、质膜和顶体完整性的影响。结果发现,与对照组相比,在稀释液中分别添加10-3和10-4 mol/L MLT均可显著提高精子活力、质膜完整率和顶体完整率(P＜0.05),且10-3 mol/L MLT添加效果最佳;MLT(10-3 mol/L)组在27 ℃孵育1、4 h后,其精子的活力、质膜完整率和顶体完整率均显著高于对照组(P＜0.05)。因此,添加10-3 mol/L MLT可明显改善牛精液品质,提高牛精液的保存时间和保存质量。 相似文献
19.
在SD大鼠成骨细胞（Osteoblast,OB）体外培养体系中添加不同浓度1α,25-二羟维生素D3（0、10^-9、10^-8、10^-7mol／L）,作用24、48、72h,测定OB增殖率、碱性磷酸酶（ALP）活性,作用48h流式细胞仪测定0B周期。结果显示,10^-9mol／L 1α,25-二羟维生素D3作用24、48、72h均促进oB增殖（P〈0.05或P〈0.01）,抑制ALP活性（P〈0.01）;10^-8、10^-7mol／L作用24、48h,OB增殖率与对照组差异不显著（P〉0.05）,但24h时ALP活性均明显升高（P〈0.05或P〈0.01）,48h则抑制了ALP活性并使OB滞留在G2／M期（P〈0.05或P〈0.01）;72h时10^-7mol／L组OB增殖率极显著低于其余各组（P〈0.01）,并使ALP活性升高（P〈0.01）。表明低浓度1α,25-二羟维生素D3能促进OB增殖,抑制其分化;高浓度1α,25-二羟维生素D3能抑制OB增殖,促进其分化,并使细胞滞留在G2／M期。 相似文献
20.
Steidinger MU Goodband RD Tokach MD Nelssen JL Dritz SS Borg BS Campbell JM 《Journal of animal science》2002,80(12):3065-3072
Two experiments were conducted to evaluate the effects of providing a water-soluble globulin in the drinking water on growth performance of weanling pigs. In Exp. 1, 360 weanling pigs (5.0 +/- 1.2 kg; 17 +/- 3 d of age; PIC) were blocked by initial weight and allotted to one of six treatments in a 2 x 3 factorial arrangement. Treatments included three diet complexity regimens with or without water-soluble globulin (3 and 1.5% solutions; d 0 to 7 and d 0 to 14, respectively) provided in the drinking water. The 35-d study was divided into three phases (d 0 to 7, 7 to 14, and 14 to 35) with corresponding lysine levels of 1.6, 1.5, and 1.35%. Soybean meal replaced specialty protein and lactose sources to provide three different complexity regimens. From d 0 to 7, a water-soluble globulin x diet complexity interaction (P < 0.05) was observed for average daily gain (ADG) and gain:feed (G/F). Increasing diet complexity increased ADG and G/F for pigs provided water, whereas the medium diet complexity regimen optimized performance for pigs offered water-soluble globulin. From d 0 to 14, pigs fed the two more complex regimens had greater ADG and G/F (P < 0.01) than the pigs fed the least complex regimen. Pigs offered water-soluble globulin had decreased (P < 0.01) ADFI, but increased (P < 0.001) G/F from d 0 to 14. For overall performance (d 0 to 35), increasing diet complexity increased (P < 0.03) ADG and ADFI, whereas water-soluble globulin offered from d 0 to 14 had no effect. In Exp. 2, 360 weanling pigs (5.2 +/- 1.6 kg; 19 +/- 4 d of age) were used in a 21-d growth assay. The trial was arranged as a 2 x 3 factorial with pigs fed the low- or medium-complexity diets (Exp. 1) with water or a 3% solution of water-soluble globulin offered for 4 or 8 d after weaning. From d 0 to 4, pigs offered water-soluble globulin had increased (P < 0.001) ADG and G/F compared with pigs provided water, whereas from d 4 to 8, pigs provided water had increased (P < 0.05) ADG and G/F compared with pigs offered water-soluble globulin. Pigs fed the medium-complexity diet had increased ADG and G/F (d 4 to 8 and d 8 to 12) compared with pigs fed the low-complexity diet. From d 0 to 8 and d 0 to 21, pigs provided water-soluble globulin for 4 or 8 d after weaning had improved G/F compared with pigs provided water. Results demonstrate that providing water-soluble globulin through the water source of weanling pigs improves ADG and G/F immediately after weaning. 相似文献