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<正> 维生素是具有生物活性的生化物质,它们对环境的理化性质改变最敏感,在贮藏中,有些因素能影响饲料中的维生素,使其活性消失,这些因素包括时间、温度、紫外光、饲料中的矿物质微量元素也会影响某些维生素的稳定性。潮湿剂和吸湿剂如氯化胆碱或尿素或是微量成分的初浓度可以缓和以上因素对维生素稳定性的影响。 相似文献
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兢兢业业游走在中国"狗圈子"里的人不难发现,在过去的几年中,很多犬种频频亮相,犬只品质也可以说是飞跃再飞跃,并通过繁殖者们的努力让这些犬中的"熟面孔"被更多的人认识并喜爱。它们成功了,因为它们走进了我们的家庭。 相似文献
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中国幅员辽阔 ,蜜源植物和蜂种资源丰富 ,养蜂和蜂产品生产、贸易历史悠久 ,蜂业文化源远流长。总养蜂量、总产量、总出口量均居世界第一位。中华蜂业的发展对世界蜂业经济作出了巨大的贡献。察古知今 ,不言而喻 ,21世纪的中国不仅是世界经济强国 ,而且是蜂业经济强国。蜂业经济规模和层次将再上一个新的台阶。蜂产品被广泛应用于各行各业 ,作为天然保健食品渗透到社会各个消费阶层。伴随着中国入WTO参与全球蜂业经济一体化进程 ,蜂产品的出口贸易势头更加强劲 ,出口创汇成为龙头 ,对外出口贸易离不开蜂产品 ,在世界蜂产品市场上占有举… 相似文献
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In the present study we report on the histotopographical distribution of lectin binding sites in the trophoblasts of day 18 to day 40 bovine embryos, using the FITC-labeled lectins BPA, Con A, DBA, GS I, GS II, MPA, PNA, SBA, UEA I and WGA. Lectin binding sites localized in giant binucleate cells differ from those localized in uninucleate cells, indicating changes in the biochemical structure of cell surfaces taking place during differentiation. In the trophoblast of the day 40 embryo, a distinct staining of uninucleate cells was seen after incubation with GS I, Con A and MPA, demonstrating N-acetylgalactosamine (GS I), Mannose (Con A) and Galactose (MPA) moieties, whereas giant binucleate cells showed intense reactions after incubation with DBA and WGA, indicating presence of N-acetylgalactosamine (DBA) and N-acetylglucosamine (WGA). GS II (specific for N-acetylglucosamine), SBA (specific for N-acetylgalactosamine) and UEA I (specific for L-Fucose) showed no affinity toward any of the examined tissues. We assume, that carbohydrate moieties in trophoblast cells play an important role in fetomaternal cell-cell adhesion and cell migration during implantation and placentation period. 相似文献
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玉米为全球养殖业广泛使用的能量饲料 ,是发展养殖业有举足轻重作用的支柱饲料。世界玉米的 70 %~ 80 %用作饲料 ,我国玉米的 5 0 %左右用作饲料 ,故有“饲料之王”的美誉。然而任何事物都有两面性 ,玉米也不例外 ,由玉米引起的养殖动物玉米源性疾病 ,数量之多 ,危害之重 ,造成经济损失之大 ,也居众籽实饲料之首。本文列举了大量实践中发生的养殖动物玉米源性疾病 ,目的在于引起人们对这一问题的关注 ,积极开展养殖动物玉米源性疾病的预防工作 ,使玉米饲料更好地在养殖业中发挥作用。1 玉米源性疾病概况1.1 贫硒玉米引起鸡、鸭缺硒症1.1.… 相似文献
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《New Zealand veterinary journal》2013,61(6)
Extract If it rained knowledge some people would not even bother to hold out their hand; so the problems of effective communication in the dissemination of knowledge, or extension work, will always be with us. It is true that some people may have been discouraged from holding out their hand because, all too often, an unattractive and incomprehensible text has landed in it. It is true also that many of us are miserly with our knowledge and too selfish or lazy to impart it to others. On the other hand there are those who are fond of the sound of their own voices and yet, in reality, have the least to say. 相似文献
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新疆和田玉籽料和戈壁料的油脂光泽相对山料和磨光料较好,为了研究它们的表皮差异以及油脂光泽差异的原因,本文利用光学显微镜和扫描电镜,观察其表面形貌,结果发现,四者在光学显微镜和扫描电镜下的形貌有较大差异.但是,它们的原始表面形貌之间除了差异又存在一定联系和转化关系. 相似文献
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