Sprague-Dawley male rats were divided into groups and maintained on a semipurified diet containing either 5 or 40 ppm of zinc or 2 or 8 ppm of copper. Half of the rats in each group received 1000 ppm aluminum in the d...Sprague-Dawley male rats were divided into groups and maintained on a semipurified diet containing either 5 or 40 ppm of zinc or 2 or 8 ppm of copper. Half of the rats in each group received 1000 ppm aluminum in the diet. It was found that aluminum accumulated in the pituitary glands and testes when dietary copper levels were suboptimal. The ALP activity in testes was depressed by the added aluminum when the intake of zinc or copper was suboptimal. SDH, LDH, and LDH-X activities were inhibited and GRS and GGTP activities were elevated in rats fed either the suboptimal zinc or copper diet. However, the added aluminum in the diet reversed the changes to normal levels. The testosterone levels in plasma changed very little when the zinc or copper intake was suboptimal. An increase in plasma FSH was demonstrated in groups of both suboptimal zinc and copper intake. But the plasma LH was elevated only in the group receiving the suboptimal copper diet, and the added aluminum reversed plasma LH to control levels. A lower level of testosterone was demonstrated in the group given suboptimal copper with aluminum. It was concluded that dietary aluminum influenced the pituitary-testicular axis by interacting with certain essential trace metals, particularly zinc. 1990 Academic Press. Inc.展开更多
研究旨在探讨新西兰兔采用不同激素诱导超数排卵和胚胎移植效果的影响因素。试验考察不同激素[促卵泡激素(FSH)、孕马血清促性腺激素(PMSG)]、季节及经产与否等因素对母兔(供体)超数排卵效果的影响,并考察经产与否及同步发情方式对母兔...研究旨在探讨新西兰兔采用不同激素诱导超数排卵和胚胎移植效果的影响因素。试验考察不同激素[促卵泡激素(FSH)、孕马血清促性腺激素(PMSG)]、季节及经产与否等因素对母兔(供体)超数排卵效果的影响,并考察经产与否及同步发情方式对母兔(受体)胚胎移植效果的影响。结果显示,使用两种不同方案进行超排后,试验组Ⅰ母兔的排卵点总数、平均排卵点数、卵泡囊肿总数、平均卵泡囊肿数、可用胚胎总数、平均可用胚胎数、畸形胚胎数、胚胎畸形率均高于试验组Ⅱ(P>0.05),且两组中经产母兔平均排卵点数、平均可用胚胎数均显著高于青年母兔(P<0.05),春季进行超数排卵的平均排卵点数、平均可用胚胎数显著高于夏季(P<0.05)。经产母兔作为受体的妊娠率和产活仔数均高于青年母兔,但差异不显著(P>0.05)。光照调控组的妊娠率和产活仔数最高,但3组差异不显著(P>0.05)。研究表明,春季使用经产母兔为供体,采用60 IU PMSG进行超数排卵处理,通过光照调控同步发情,以经产母兔为受体进行胚胎移植,受孕率和产活仔数最佳。展开更多
文摘Sprague-Dawley male rats were divided into groups and maintained on a semipurified diet containing either 5 or 40 ppm of zinc or 2 or 8 ppm of copper. Half of the rats in each group received 1000 ppm aluminum in the diet. It was found that aluminum accumulated in the pituitary glands and testes when dietary copper levels were suboptimal. The ALP activity in testes was depressed by the added aluminum when the intake of zinc or copper was suboptimal. SDH, LDH, and LDH-X activities were inhibited and GRS and GGTP activities were elevated in rats fed either the suboptimal zinc or copper diet. However, the added aluminum in the diet reversed the changes to normal levels. The testosterone levels in plasma changed very little when the zinc or copper intake was suboptimal. An increase in plasma FSH was demonstrated in groups of both suboptimal zinc and copper intake. But the plasma LH was elevated only in the group receiving the suboptimal copper diet, and the added aluminum reversed plasma LH to control levels. A lower level of testosterone was demonstrated in the group given suboptimal copper with aluminum. It was concluded that dietary aluminum influenced the pituitary-testicular axis by interacting with certain essential trace metals, particularly zinc. 1990 Academic Press. Inc.
文摘研究旨在探讨新西兰兔采用不同激素诱导超数排卵和胚胎移植效果的影响因素。试验考察不同激素[促卵泡激素(FSH)、孕马血清促性腺激素(PMSG)]、季节及经产与否等因素对母兔(供体)超数排卵效果的影响,并考察经产与否及同步发情方式对母兔(受体)胚胎移植效果的影响。结果显示,使用两种不同方案进行超排后,试验组Ⅰ母兔的排卵点总数、平均排卵点数、卵泡囊肿总数、平均卵泡囊肿数、可用胚胎总数、平均可用胚胎数、畸形胚胎数、胚胎畸形率均高于试验组Ⅱ(P>0.05),且两组中经产母兔平均排卵点数、平均可用胚胎数均显著高于青年母兔(P<0.05),春季进行超数排卵的平均排卵点数、平均可用胚胎数显著高于夏季(P<0.05)。经产母兔作为受体的妊娠率和产活仔数均高于青年母兔,但差异不显著(P>0.05)。光照调控组的妊娠率和产活仔数最高,但3组差异不显著(P>0.05)。研究表明,春季使用经产母兔为供体,采用60 IU PMSG进行超数排卵处理,通过光照调控同步发情,以经产母兔为受体进行胚胎移植,受孕率和产活仔数最佳。
文摘【目的】研究连翘叶提取物(Forsythia suspensa leaves extract,FSLE)对孕马血清促性腺激素(pregnant mare serum gonadotropin,PMSG)在肝脏中代谢的影响,改善在畜牧生产中因PMSG代谢缓慢而造成的氧化应激。【方法】采用半仿生酶醇法提取连翘叶有效成分,给予昆明雌鼠不同含量的FSLE进行动物体内试验;收集小鼠血清,进行酶联免疫吸附试验,检测各组小鼠血清中PMSG的质量浓度;采集小鼠肝脏组织,检测氧化应激指标谷胱甘肽、超氧化物歧化酶、丙二醛和过氧化氢的水平;采用Western-blot检测小鼠肝脏组织孕烷X受体(pregnane X receptor,PXR)和细胞色素酶P45017A1(cytochrome P45017A1,CYP17A1)蛋白的表达水平。【结果】FSLE可显著降低小鼠血清中PMSG的质量浓度,且可以减缓PMSG代谢引起的氧化应激。Western-blot结果显示:FSLE可显著下调小鼠肝组织中PXR和CYP17A1蛋白的表达。【结论】连翘叶提取物可能是通过下调肝脏中PXR和CYP17A1的表达减缓PMSG代谢引起的氧化应激。
