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本文简述了生理活性物质茶多酚的理化特性与生物学活性；剖析了茶多酚的作用机理；并展望了茶多酚在饲料工业及畜牧业中的应用前景。 相似文献
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试验旨在探究无抗饲粮中添加茶多酚对仔猪生长性能、血清生化指标和抗氧化能力的影响。选取48头体重相近、健康的45日龄仔猪（公猪），随机分为2组，每组6个重复，每个重复4头仔猪。对照组饲喂基础饲粮，茶多酚组在基础饲粮中添加500 mg/kg茶多酚，试验期35 d。结果表明：与对照组相比，茶多酚组的腹泻率和腹泻指数均降低（P<0.01），茶多酚组仔猪体重、平均日增重均提高（P<0.01、P<0.05），耗料增重比降低（P<0.05）；与对照组相比，茶多酚组血清白蛋白和高密度脂蛋白胆固醇的含量提高（P<0.05或P<0.01），血糖、甘油三酯和低密度脂蛋白胆固醇含量以及谷丙转氨酶和碱性磷酸酶的活性均降低（P<0.05或P<0.01）；茶多酚组血清总抗氧化能力、谷胱甘肽过氧化物酶和超氧化物歧化酶活性均提高（P<0.01），血清乳酸脱氢酶活性和丙二醛含量则均降低（P<0.01）。由此可见，在无抗饲粮中添加500 mg/kg茶多酚可以显著提高仔猪抗腹泻能力和生长性能，改善血清生化指标和提高机体抗氧化能力。 相似文献
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茶多酚是茶叶中的主要活性物质之一,因其资源丰富,应用效果明显,已经广泛在动物生产中使用。文章综述茶多酚的生物学功能及其在动物生产中的应用。 相似文献
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浅析天然抗氧化剂茶多酚的几个问题 总被引：1，自引：0，他引：1
本文讨论了茶多酚制品的化学组成，茶多酚抗氧活性与构效关系，茶多酚的抗氧化作用机理，以及茶多酚制品的“纯度”和分析方法等问题。认为用茶多酚制品酒石酸亚铁比色法测定值来表示茶多酚“纯度”是不确切的，用ＨＰＬＣ法测定儿茶素总量和（－）－ＥＧＣＧ含量来衡量茶多酚的质量指标却是准确可行的。 相似文献
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茶多酚抗氧化活性的研究 总被引：9，自引：0，他引：9
茶多酚是一种活性很强的抗氧剂,在机体内能清除自由基,阻断N—亚硝基化合物形成,抑制脂氧合酶活性和脂质过氧化作用,起着防突变、防癌抗癌、抗衰老的功效。茶多酚能有效地抑制油脂的氧化“酸败”,是食品工业的抗氧剂和保鲜剂。本文就茶多酚的抗氧化力和对油脂的抗氧化活性进行了测定。结果证明:茶多酚的抗氧化活性强于维生索E、维生素C和丁基羟基甲苯(BHT)。 相似文献
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选择中国大陆最早分离的H9N2亚型禽流感病毒(avian influenza virus,AIV)A/Chicken/Guangdong/SS/94(H9N2)(缩写为SS株)和1998年大流行时期分离的H9N2亚型AIVA/Chicken/Shanghai/F/98(H9N2)(缩写为F株)为研究对象,对其在SPF鸡体内的复制能力和传播途径特性比较后发现,F株在4周龄SPF鸡气管中的复制能力高于SS株,F株可以经气溶胶传播途径传播,SS株不能经气溶胶传播途径传播;利用反转录-聚合酶链反应(RT-PCR)方法获取F株和SS株的HA和NA基因的cDNA,序列分析得知,F株和SS株的HA和NA基因的同源性分别是96.6%和98.1%;HA基因的裂解位点氨基酸序列都是PARSSR↓GL,但有5个氨基酸的差异,即166位N(F)→D(SS)、198位A(F)→V(SS)、217位V(F)→I(SS)、335位G(F)→R(SS)、504位L(F)→S(SS);2株病毒的NA基因在63~65位都存在氨基酸缺失,但在NA基因红细胞吸附位点的氨基酸序列不同,分别是IKKDSRSG(F)和IKEDLRSG(SS)。F株和SS株的传播特性差异是否与其表面基因序列有关,有待进一步研究。 相似文献
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禽类的起源、演化及我国主要家禽品种类型与分布 总被引：1，自引：1，他引：0
家禽是重要经济价值动物.本文从禽类种群进化学说出发,简介了禽类的起源、演化、动物学分类和家禽的驯化(养)与品种的形成,并对我国主要家禽(鸡、鸭、鹅)地方品种和培育品种(配套系)的分布与类型作了描述,以期为研究我国家禽起源系统,保护与利用我国家禽品种,促进家禽生产可持续发展提供参考. 相似文献
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近年以来,由于市场因素的刺激,生猪的存养量大幅上升,再加上由于流通环节较多,流通非常频繁,流通距离越来越远。这对繁荣经济,增加养殖效益起了重要的推动作用,但也同时给疾病的感染和传播创造了有利条件,给猪病的防治带来了困难。有的猪场感染了传染病后,由于治疗不及时不得法,而造成了惨重的经济损失。2008年7月中旬,我街道一养猪户因盲目从外地购进中猪,发生猪病疫情,引起猪只连续死亡,造成一定的经济损失。根据流行病学、临床症状、剖检变化和实验室诊断,诊断该病为猪链球菌病和猪伪狂犬病混合感染,现报告如下。 相似文献
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１前言１．１鸡白冠病鸡白冠病是由卡氏住白细胞原虫寄生于鸡的红细胞和单核细胞而引起的鸡的贫血性疾病。吸血昆虫蚋和库蠓叮咬鸡引起传播，是主要的传播媒介，一般在夏末和秋季多发，由于夏季降雨量较大，部分沟渠积水，库蠓和蚋多孳生，因此在多雨水涝的年份发病率明显增高。１９９８年中国从南到北发生洪涝灾害，吸血昆虫的孳生格外严重，出现了一个白冠病多发年，而后两年发病稍轻，并有地区性，今年８月中旬以来白冠病的发病呈抬头趋势，有一定的死亡率，对蛋鸡产蛋率也会引起一定程度的降低，应引起养鸡户的重视。１．２鸡痘鸡痘也是… 相似文献
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Pinard CL Weiss ML Brightman AH Fenwick BW Davidson HJ 《American journal of veterinary research》2003,64(1):104-108
OBJECTIVE: To evaluate lactoferrin and lysozyme content in various ocular glands of bison and cattle and in tears of bison. SAMPLE POPULATION: Tissues of ocular glands obtained from 15 bison and 15 cattle and tears collected from 38 bison. PROCEDURE: Immunohistochemical analysis was used to detect lysozyme and lactoferrin in formalin-fixed, paraffin-embedded sections of the ocular glands. Protein gel electrophoresis was used to analyze ocular glands and pooled bison tears by use of a tris-glycine gel and SDS-PAGE. Western blotting was used to detect lactoferrin and lysozyme. RESULTS: Immunohistochemical staining for lactoferrin was evident in the lacrimal gland and gland of the third eyelid in cattle and bison and the deep gland of the third eyelid (Harder's gland) in cattle. Equivocal staining for lactoferrin was seen for the Harder's gland in bison. An 80-kd band (lactoferrin) was detected via electrophoresis and western blots in the lacrimal gland and gland of the third eyelid in cattle and bison, Harder's glands of cattle, and bison tears. An inconsistent band was seen in Harder's glands of bison. Lysozyme was not detected in the lacrimal gland of cattle or bison with the use of immunohistochemical analysis or western blots. Western blots of bison tears did not reveal lysozyme. CONCLUSIONS AND CLINICAL RELEVANCE: Distribution of lactoferrin and a lack of lysozyme are similar in the lacrimal gland of cattle and bison. Differences in other tear components may be responsible for variability in the susceptibility to infectious corneal diseases that exists between bison and cattle. 相似文献
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Harvey CE 《Journal of veterinary dentistry》2002,19(4):186-195
Crown width, height and buccal surface areas were measured on heads or skulls of four dogs and four cats, and were compared with similar measurements on models of human dentition. Buccal surface area variability was greater in dogs and cats than in humans, and teeth of cats were smaller. Horizontal (gingival and occlusal halves) and vertical (mesial, middle, and distal thirds) buccal surface area variability was also greater in canine and feline teeth compared with human teeth. This increased variability suggests the need for testing of reliability and repeatability of scoring when using plaque and calculus indices based on horizontal or vertical segmentation. Buccal surface area variability between teeth also prompts questioning the validity of equal weighting of smaller, irregularly-shaped teeth when calculating a mean mouth score. Whether equal or more reliable results would be obtained from scores of whole teeth in comparison with segmentation indices used currently has yet to be determined. 相似文献
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Over a period of about 12 years, 30 abnormal Schistosoma mattheei cercariae were found among a total of approximately 2.8 million examined. Initially seven were recovered from about 1.02 million (0.0007%), which were examined individually while being counted with the aid of a stereoscopic microscope. Subsequently, on the strength of relatively high percentages of abnormal individuals recovered when counting cercariae that failed to penetrate into oxen, it appeared that the morphologically abnormal cercariae were unable to swim and would mostly sediment out of a suspension while most of the normal cercariae would remain swimming. This surmise is supported by recovery of 23 morphologically abnormal cercariae (0.001%) from about 1.8 million, by examining the sediment after the cercarial suspension had been left standing undisturbed in glass measuring cylinders. The abnormalities ranged from aberrant tails only (e.g. an underdeveloped tail, or different degrees of schism) or aberrant heads only, to abnormalities of both the heads and tails. A suggested schematic classification of abnormal cercariae is presented. A young, adult hamster was exposed to eight S. mattheei cercariae with complete schism of the shaft of the tail, by pipetting the cercariae onto the shaved abdominal skin of the anaesthetised animal. Two underdeveloped females were subsequently encountered in squash preparations of the liver when the hamster was killed for worm recovery 10 weeks after infection, thus showing that some of the abnormal cercariae were viable. A method is also described for killing and fixing cercariae while retaining some of the shining brilliance of live cercariae, without them becoming shrivelled, granular and semi-opaque, as occurs when cercariae die spontaneously or are killed with heat. This is apparently the first report of abnormal cercariae of S. mattheei. In addition, a method of concentrating abnormal cercariae after emergence from a snail, a schematic classification of abnormal cercariae and a method for killing and fixing cercariae while retaining much of the shiny brilliance of live cercariae are also reported for the first time as far as is known. 相似文献