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《上海畜牧兽医通讯》2016,(4)
为了解云南省芒市德宏水牛乳脂率及其与DHI(奶牛生长性能测定)其他指标的相关性,本研究对2012年2~12月德宏州芒市部分奶牛场570份奶水牛DHI指标进行了测定分析。结果表明,乳脂率与乳蛋白率呈正相关(P0.01,r=0.332),与乳糖率呈负相关(P0.01,r=-0.264),与总固体率呈正相关(P0.01,r=0.792),与产奶量呈负相关(r=0.390,P0.01);乳脂率与非脂固体、体细胞数、尿素氮的相关性不显著(P0.05)。本文通过对德宏水牛乳脂率与DHI数据分析,为德宏水牛良种资源的饲养管理和水牛乳开发利用奠定了一定的基础。 相似文献
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陆静 《北方牧业(奶牛)》2008,(10)
最近农业部对奶业DHI的宣传和推广的力度非常大,具体的体现是,对参加DHI测试的每头牛补贴2元、5元甚至更多。从DHI在国内率先建立至今,已经有13年之久,但真正大力度的政府扶持还是从去年开始,这对奶农和整个中国奶业的发展是一个切实有效的举措。毕竟,中国还仅仅只有不到5%的牛群在参加DHI这个系统,那么要与其他国家类似达到50-90%的比例, 相似文献
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<正>DHI是Dairy Herd Improvement的缩写,其含义是奶牛群体改良,在我国又称为奶牛生产性能测定,是目前指导世界奶牛业发达国家奶牛生产所普遍采用的关键生产技术。通过每月定期收集奶牛系谱、胎次、产犊日期、干奶日期、淘汰日期等牛群饲养管理基础数据,同时,每月对泌乳牛个体采集奶样一次,通过测定奶样的乳脂率、乳蛋白率、体细胞数、BHB等数据,经过计算机整理分析后,形成DHI(生产性能测定)报告,并反馈给牛场,来数字化的指导牛场的生产经营管理。1.参加DHI(奶牛生产性能测定)的意义1.1 DHI测定可以完善奶牛生产记录体系DHI测定提供了一个有效的量化管理牛群工具,并且这种量化能够针对每个个体牛只进行,并且奶牛生产性能测定还 相似文献
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Meori Rosen 《中国乳业》2012,(11):27-29
本文对高效益的牛群结构组成以及以色列DHI技术体系进行了介绍。笔者认为,高效益的牛群组成为,牛群内有少量高产牛和多数中低产牛;DHI技术对于发现制约奶牛产奶量提高的限制因素有重要作用;以色列的DHI技术体系对中国的奶牛养殖业有很大的借鉴意义。 相似文献
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本研究用酶联免疫吸附试验(ELISA)对采集自北京地区的94份奶牛血清(随机采集)和河北地区的55份奶牛血清(有流产史奶牛),进行Neospora caninum血清抗体检测。结果发现,北京地区随机采集的奶牛血清N.caninum抗体阳性率为18.1%(17/94),河北地区有流产史的奶牛N.caninum血清抗体阳性率为23.6%(13/55)。采用牛奶记录体系(DHI)对北京地区17头N.caninum血清抗体阳性牛进行了日产奶量、乳中蛋白率和乳脂率的测定,并与同群牛中134头阴性牛比较。结果表明,N.caninum血清抗体阳性牛日产奶量比阴性牛降低9.7%,乳中蛋白率和乳脂率分别降低20%和15.4%。初步证明N.caninum血清抗体阳性奶牛产奶量降低及奶品质的下降。对不同N.caninum抗体滴度阳性牛的泌乳期主要生产性能比较发现,其生产性能的变化与抗体滴度无明显相关性。 相似文献
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本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
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以国际标准强毒R株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离MG,并收集感染鸡所产蛋分离MG。结果表明,人工感染48小时后上、下呼吸道及肺已被全面感染,96小时气囊已被感染,120小时输卵管已能分离到MG,卵巢始终分离不到MG。人工感染鸡自144小时便能在其所产蛋中分离出MG。药物治疗能在72小时内消除感染,油乳剂苗则需24天后逐渐降低蛋内MG分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内MG,但以研制的种蛋浸泡剂药浴效果为最好。 相似文献
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Reasons for performing study: Clinical experiences indicate that centesis of the lateral compartment of the femorotibial joint is often unsuccessful. Objective: To determine the accuracy of 2 published and 2 unpublished techniques of centesis of the lateral compartment of the femorotibial joint. Hypothesis: It was hypothesised that a drug can be administered into the lateral compartment of the femorotibial joint via a diverticulum of this joint that surrounds the medial aspect of the long digital extensor tendon and that this technique is more accurate than described techniques of centesis of this compartment. Methods: Twenty‐four stifles of 12 horses were divided equally into 4 groups and a radiocontrast medium injected into the lateral compartment of the femorotibial joint of each group using a hypodermic needle inserted: 1) caudal to the lateral patellar ligament and proximal to the tibial plateau, 2) caudal to the long digital extensor tendon and proximal to the tibial plateau, 3) between the long digital extensor tendon and bone of the extensor groove of the tibia or 4) directly through the long digital extensor tendon until it contacted bone. Twelve veterinary students who had no experience using any of these techniques performed the injections. Accuracy of each technique was determined by examining radiographs obtained after injecting the contrast medium. Results: The most successful technique for arthrocentesis was by inserting a needle through the long digital extensor tendon. This approach was successful in all attempted cases, whilst other techniques had lower rates of success. Conclusions: The lateral compartment of the femorotibial joint can be accessed accurately by inserting a needle through the long digital extensor tendon as it lies within the extensor groove. Other techniques may not be as accurate for clinicians inexperienced in arthrocentesis of the lateral compartment of the femorotibial joint. 相似文献
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魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
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本试验旨在研究两种绿头鸭(白羽绿头鸭和绿头鸭)肌肉营养组成和价值,为绿头鸭肉产品的开发利用提供基础数据和理论依据。选择白羽绿头鸭和绿头鸭60只(每个品种各30只,公母各半),依照国家标准测定胸肌粗蛋白质、粗脂肪、胆固醇含量及氨基酸、脂肪酸、微量元素和维生素的组成和含量,并对胸肌进行氨基酸评价及脂肪酸营养价值评价。结果显示,白羽绿头鸭肌肉粗蛋白质含量显著低于绿头鸭(P<0.05);两种绿头鸭肌肉中均检测到17种含量大于0.01%的氨基酸,其中白羽绿头鸭肌肉苏氨酸、组氨酸、丝氨酸和脯氨酸含量显著高于绿头鸭(P<0.05),赖氨酸、谷氨酸和精氨酸含量显著低于绿头鸭(P<0.05);检测到13种含量均大于0.01%的脂肪酸,其中白羽绿头鸭硬脂酸和油酸含量显著低于绿头鸭(P<0.05);检测到9种矿物质元素(钠、镁、钾、钙、锰、铁、铜、锌和硒),两种绿头鸭差异不显著(P>0.05);检测到8种维生素,白羽绿头鸭肌肉维生素B1含量显著高于绿头鸭(P<0.05),维生素D和维生素E含量显著低于绿头鸭(P<0.05)。两种绿头鸭肌肉氨基酸比例接近世卫组织推荐的理想模式,富含人体所需的矿物质元素和维生素,具有广阔的开发利用前景。 相似文献
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Marioni-Henry K Vite CH Newton AL Van Winkle TJ 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2004,18(6):851-858
A retrospective review of records of 205 cats with histologically confirmed disease of the spinal cord was performed to identify the prevalence of disease in this nonrandomly selected population of cats. Clinical records were reviewed, and age, duration of neurologic illness, and clinical and histopathologic findings in cats with spinal cord disease were abstracted. Disease processes were classified into 7 categories and 23 groups. The most common diseases affecting the spinal cord of cats were feline infectious peritonitis (FIP), lymphosarcoma (LSA), and neoplasia of the vertebral column secondarily affecting the spinal cord. Information on age, onset and duration of clinical signs, and lesion localization at the postmortem examination in cats belonging to the 7 categories of disease were analyzed to create a practical list of differential diagnoses. Cats were also subcategorized into 3 groups based on their age at death. FIP was the most common disease of cats younger than 2 years of age. LSA and vertebral column neoplasia were the most common diseases affecting cats between 2 and 8 years of age. Vertebral column neoplasia was the most common disease affecting cats older than 8 years of age. Results of this histopathologic study showed that FIP and LSA were the most common disease processes affecting the spinal cord of cats. However, at least 21 other groups of diseases and their relative prevalence were identified. 相似文献
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根据JJF1059-1999《测量不确定度评定与表示》建立了高效液相色谱法测定鸡肉中土霉素残留测量的不确定度评定方法,评定过程包括建立测量程序、分析不确定度来源、对不确定度分量进行量化。将不确定度归类为两大类。随机效应导致的不确定度可以通过一系列具有统计意义的重复观测值进行A类评定;系统效应导致的不确定度通过各测量器具、设备的说明书、校准证书提供的参数进行B类评定。本方法鸡肉中土霉素残留量的相对合成标准不确定度约为3.9%。 相似文献
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以5个金柑属品种、枳壳、软枝酸橘及广西土柠檬实生苗为材料,进行复水成活率、旱害指数、叶片相对含水量、超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)、丙二醛(MDA)、脯氨酸等生理指标及隶属函数的综合分析,为柑橘抗性砧木品种选育提供参考。结果表明:胁迫20d复水后的成活率融安滑皮金柑和长寿金柑最高,为100%,软枝酸橘最低,为88.9%;随着干旱胁迫加剧,各品种的旱害指数呈上升趋势,长寿金柑的旱害指数最低,为0.25,软枝酸橘的旱害指数最高,为0.61;从叶片相对含水量的结果来看,长寿金柑的变化幅度最小,软枝酸橘的变化幅度最大,在第18d时分别为61.19%和37.85%;3种保护酶之间相互协同作用减轻植株受害程度,其活性变化幅度与丙二醛和脯氨酸的含量变化相似。利用隶属函数法综合分析,得出各品种的抗旱性强弱依次为长寿金柑>枳壳>融安滑皮金柑>融安金柑>山金柑>广西土柠檬>金枣>软枝酸橘。 相似文献