[目的]研究牛活体采卵-体外受精(ovum pick-up and in vitro fertilization,OPU/IVF)体系,建立高效的牛体外胚胎生产系统。[方法]以从屠宰场采集的健康牛新鲜卵巢为试验材料,进行卵母细胞体外成熟、体外受精、体外胚胎培养相关条件的摸...[目的]研究牛活体采卵-体外受精(ovum pick-up and in vitro fertilization,OPU/IVF)体系,建立高效的牛体外胚胎生产系统。[方法]以从屠宰场采集的健康牛新鲜卵巢为试验材料,进行卵母细胞体外成熟、体外受精、体外胚胎培养相关条件的摸索,重点考查体外胚胎培养液中添加瘦素(leptin)对囊胚率的影响。选取13~15月龄健康荷斯坦奶牛及和牛各10头作为供体,进行活体采卵、卵母细胞体外成熟、体外胚胎生产,记录可用卵数及可用囊胚数,统计卵裂率、囊胚率;2个品种牛的体外冷冻胚胎解冻后,以荷斯坦奶牛为受体进行胚胎移植,移植后45 d统计妊娠率。[结果]添加30 U/mL的leptin可以显著(P<0.05)提高屠宰场来源牛体外胚胎的囊胚率。随机选择供体牛活体采卵,平均每头荷斯坦奶牛获得可用卵7.5枚,平均每头和牛获得可用卵8.1枚;荷斯坦奶牛及和牛的卵裂率分别为84.00%、82.71%,二者差异不显著(P>0.05)。体外培养条件下,平均每头荷斯坦奶牛获得可用囊胚4.3枚,平均每头和牛获得可用囊胚3.7枚;荷斯坦奶牛的囊胚率(57.33%)显著(P<0.05)高于和牛(45.68%)。体外胚胎解冻后移植,荷斯坦奶牛胚胎组的妊娠率为54.17%,和牛胚胎组的妊娠率为55.79%,二者差异不显著(P>0.05)。[结论]该研究建立的OPU/IVF体系可以有效提高优质母牛的利用效率,降低生产成本,为牛体外胚胎生产系统的优化提供了参考。展开更多
Since the 18th National Congress,forging a sense of community for the Chinese nation has become the guiding principle of Minzu Work;and it serves the overall goal of building a modern socialist country with Chinese ch...Since the 18th National Congress,forging a sense of community for the Chinese nation has become the guiding principle of Minzu Work;and it serves the overall goal of building a modern socialist country with Chinese characteristics and the great rejuvenation of the Chinese nation.In order to forge a sense of community for the Chinese nation,having top design and material basis is not enough,dynamic motivation and actual practice are also necessary to connect the two together closely.Semiotic activities,which integrate sensory perceptibility,indexicality and symbolic meaning may act as the binding agent and coagulant that stick together the"material form"and the""spirit"of the top design,so as to develop naturalized habituation and match our actions to our words.Culture is embodied not only in the sophisticated and exceedingly esteemed theories and arts,but also in the rich spectrum of daily life of the general public;it involves the semiosis of triads:sensory perceptibility,indexicality,and symbolic values.Here the formation of habits is also involved.Though forging a sense of community for the Chinese nation happens on a cultural-ethical level,it has to be tangibly supported with the motivated will and physical sensations.展开更多
文摘[目的]研究牛活体采卵-体外受精(ovum pick-up and in vitro fertilization,OPU/IVF)体系,建立高效的牛体外胚胎生产系统。[方法]以从屠宰场采集的健康牛新鲜卵巢为试验材料,进行卵母细胞体外成熟、体外受精、体外胚胎培养相关条件的摸索,重点考查体外胚胎培养液中添加瘦素(leptin)对囊胚率的影响。选取13~15月龄健康荷斯坦奶牛及和牛各10头作为供体,进行活体采卵、卵母细胞体外成熟、体外胚胎生产,记录可用卵数及可用囊胚数,统计卵裂率、囊胚率;2个品种牛的体外冷冻胚胎解冻后,以荷斯坦奶牛为受体进行胚胎移植,移植后45 d统计妊娠率。[结果]添加30 U/mL的leptin可以显著(P<0.05)提高屠宰场来源牛体外胚胎的囊胚率。随机选择供体牛活体采卵,平均每头荷斯坦奶牛获得可用卵7.5枚,平均每头和牛获得可用卵8.1枚;荷斯坦奶牛及和牛的卵裂率分别为84.00%、82.71%,二者差异不显著(P>0.05)。体外培养条件下,平均每头荷斯坦奶牛获得可用囊胚4.3枚,平均每头和牛获得可用囊胚3.7枚;荷斯坦奶牛的囊胚率(57.33%)显著(P<0.05)高于和牛(45.68%)。体外胚胎解冻后移植,荷斯坦奶牛胚胎组的妊娠率为54.17%,和牛胚胎组的妊娠率为55.79%,二者差异不显著(P>0.05)。[结论]该研究建立的OPU/IVF体系可以有效提高优质母牛的利用效率,降低生产成本,为牛体外胚胎生产系统的优化提供了参考。
文摘Since the 18th National Congress,forging a sense of community for the Chinese nation has become the guiding principle of Minzu Work;and it serves the overall goal of building a modern socialist country with Chinese characteristics and the great rejuvenation of the Chinese nation.In order to forge a sense of community for the Chinese nation,having top design and material basis is not enough,dynamic motivation and actual practice are also necessary to connect the two together closely.Semiotic activities,which integrate sensory perceptibility,indexicality and symbolic meaning may act as the binding agent and coagulant that stick together the"material form"and the""spirit"of the top design,so as to develop naturalized habituation and match our actions to our words.Culture is embodied not only in the sophisticated and exceedingly esteemed theories and arts,but also in the rich spectrum of daily life of the general public;it involves the semiosis of triads:sensory perceptibility,indexicality,and symbolic values.Here the formation of habits is also involved.Though forging a sense of community for the Chinese nation happens on a cultural-ethical level,it has to be tangibly supported with the motivated will and physical sensations.
