共查询到20条相似文献,搜索用时 93 毫秒
1.
钙、磷二元素是促进有机体生长的重要营养物质,在猪体内占全部矿物质的65—70%,钙占体重的1.5%,磷占1%左右。很多学者对生长猪不同阶段的钙、磷需要量作过研究。1973年,美国国家研究委员会在制订生长猪的钙、磷需要量时,规定其在饲料中的含量分别为0.2~0.5%、0.4~0.6%。1978年,我国根据本国猪种的生理要求,在《猪的营养标准草案》中规定:钙、磷含量分别为0.48~0.61%、0.43~0.51%。我国一般谷物饲料中的钙、磷含量低于《草案》所规定的指标。本试验的目的是研究低钙、磷量对生长猪的影响。方法:根据谷物饲料内营养物质的含量及钙、磷比例的多少,搭配成能朊基本一致,但钙、磷比例不同的三个组。其中,1组为对照组,钙、磷含量接近《草案》所 相似文献
2.
3.
尚启昕 《畜牧兽医科技信息》2019,(10)
正矿物质在猪体内含量虽很少,但其能发挥重要功能是猪生长发育、繁殖以及生产的必要元素观将猪对常见矿物质营养的需求介绍如下。1钙和磷钙和磷主要被用于骨骼发育,对机体代谢也发挥着重要作用是生长、妊娠和泌乳所必需的矿物质。体重为20~50kg生长猪,NRC的钙和磷需要量分别为0.6%和0.5%,体重较 相似文献
4.
1补足维生素后备猪饲料中的维生素必须按照种猪的需要量来供应,充足的维生素能促进生殖器官发育、正常发情、增加排卵数、提高受孕率,可根据需要量补充。2足量的钙、磷高瘦肉型猪的骨骼发育比较晚,在后备母猪发育后期到配种阶段,需要提供含有更高的钙磷水平的日粮来增加矿物质的沉积。钙磷的需要量要按照种猪的需要量来供应,使后备猪拥有强壮的四肢。 相似文献
5.
锌是畜禽必需的微量元素之一,其主要生物学功能是参予及影响机体的物质代谢,维持机体的正常免疫功能,保持生物膜的稳定性和保持畜禽繁殖器官的完整性。畜禽缺锌时,物质代谢紊乱,生长发育受阻,机体的免疫机能下降,繁殖性能也受到较严重的影响。本文就锌缺乏对畜禽繁性能影响的研究情况作一简述。1.缺锌对猪繁殖性能的影响猪对锌的需要量受很多因素的影响,如饲料种类、日粮组成及猪生长强度等。更为重要的是猪对锌的需要量与日粮中钙的含量密切相关。钙可明显影响到猪对锌的吸收,高钙口粮可诱发加重猪的缺锌症状。缺锌对猪骨器正常… 相似文献
6.
美国肯塔基大学数年前进行的研究显示,2~4倍于生长猪需要量的钙量可能是危险的。该研究的最初目的是评价饲粮中不同的钙·磷比对生长猪的生长率、饲料利用率和骨骼强度的影响。3项试验共使用192头汉普夏-约克夏猪,饲粮含 相似文献
7.
8.
一、对以往矿物质的再认识和新需要量的探讨 (1)磷和钙近几年、饲料中磷、钙比例受到特別的重视。据报道,对猪的生长及骨的形成试验 相似文献
9.
10.
四、猪的氨基酸需要量及“理想蛋白质”(IP)氨基酸模式的实际应用 1.猪的氨基酸需要量 猪的氨基酸需要量通常用日粮浓度或猪的不同阶段的日需要量来表示。这样的需要量定量方法对同一阶段的不同的猪都一样,没有区别。许多研究发现,同一阶段的猪,对氨基酸 相似文献
11.
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
12.
13.
14.
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 Objective: To determine the accuracy of 2 published and 2 unpublished techniques of centesis of the lateral compartment of the femorotibial joint.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
15.
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
16.
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
17.
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
18.
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
19.
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
20.
应用光镜和透射电镜技术,观察了3~6月龄比格犬甲状腺的显微和超微结构。结果表明,比格犬甲状腺实质由滤泡和滤泡旁细胞构成。滤泡呈圆形或椭圆形,直径20.22~220.00μm,平均90.80μm;由单层立方上皮细胞围成,细胞高度3.04~7.11μm,平均5.18μm,电镜下可见功能状态不同的两型滤泡上皮细胞;滤泡旁细胞很多,直径4.40~8.82μm,平均6.23μm,位于滤泡之间或镶嵌于滤泡上皮细胞之间,也可聚集在一起形成滤泡样结构,胞质内含有大量的分泌颗粒,电镜下也可见两种类型的滤泡旁细胞。 相似文献