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不同水平甘氨酸锌对断奶仔猪生长性能的影响 总被引:1,自引:0,他引:1
锌是动物必需的微量元素之一,作为体内200多种酶的必需组分或激活因子,锌广泛参与体内的一系列代谢活动,锌还是许多转录因子的必需组分。动物缺锌会出现生长受阻,厌食,皮肤损坏,骨骼畸形,免疫力及繁殖力下降等症状。仔猪对锌的需求量很高,但饲粮中锌含量较低,且存在许多限制锌吸收的因素,因此仔猪饲粮需额外添加锌。 相似文献
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"富锌宝"对断奶仔猪生长性能及血液生化指标的影响 总被引:1,自引:1,他引:1
锌是动物的必需微量元素之一,通过作为体内200多种酶的必需组分或激活因子而广泛参与体内的一系列代谢活动,而且锌还是许多转录因子的必需组分。动物缺锌会出现生长受阻、厌食、皮肤损坏、骨骼畸形及免疫力和繁殖力下降等症状。仔猪对锌的需要量很高,但实用饲粮中锌含量较低,且存在许多限制锌吸收的因素,因此在仔猪饲粮中需要额外添加锌。目前,仔猪等畜禽饲粮中最常用的锌添加形式为无机锌(如硫酸锌和氧化锌等),但无机锌易吸潮,破坏维生素,吸收率较低,适口性差, 相似文献
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高锌的作用机理及其在仔猪饲粮中的应用 总被引:3,自引:0,他引:3
锌是动物的必需矿物质微量元素之一,现已证明锌参与动物体内300多种酶和功能蛋白的组成。作为生理生化功能最为广泛的微量元素,锌不仅参与DNA、RNA、蛋白质、糖类、脂类、矿物质和维生素的代谢,而且与胰岛素、胰高血糖素、前列腺素、促性腺激素等的功能和活性有关。近年来,研究人员对仔猪饲粮高锌的促生长作用进行了大量研究。结果表明,断奶仔猪饲粮中添加高剂量的锌(2000mg/kg以上),可改善仔猪生长性能和降低断奶后腹泻率。本文根据国内外学者对仔猪锌营养的研究进展,综述了高锌的作用机理、促生长作用及其影响高锌效果的因素、使用高锌饲粮的注意事项。 相似文献
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氧化锌和氨基酸螯合锌在断奶仔猪上的应用研究 总被引:1,自引:0,他引:1
综述了20世纪60年代以来在断奶仔猪上添加氧化锌和氨基酸螯合锌的研究。锌是动物的必需微量元素,由于其在体内广泛的生理生化功能而被称为“生命元素”。传统上,动物日粮中的锌是以无机盐的形式供应的。近年来,人们对动物日粮中氨基酸螯合锌应用广为重视,因为许多报道证实,添加氨基酸螯合锌可以改进动物生长、繁殖和健康状况。 相似文献
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《中国畜牧兽医文摘》2016,(12)
<正>锌是所有动物必需的微量元素,它在畜体内分布很广,几乎在所有的家畜组织中均能找到,其中主要存在于肝脏、胰脏、肌肉、性腺和骨骼等组织中。但是食物和饲料中的锌多数以结合态存在,它在动物体内多与蛋白质、氨基酸、核酸和植酸酶结合,是多种酶的组成成分或激活剂,并参与多种生化发应,具有降低断奶仔猪腹泻、促进仔猪生长的作用,且能提高断奶仔猪饲料蛋白质利用率,降低组织蛋白分解。但饲喂无机高锌饲粮不但造成 相似文献
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1.高钙饲粮对单胃动物锌的利用有拮抗作用,钙不仅影响锌的吸收,而且影响锌在体内的分配.2.植酸在钙与锌拮抗关系中起一定的介导作用,植酸本身也不利于锌的利用.3.钙与锌除了其本身的拮抗关系和植酸的介导作用之外,还与饲粮磷水平、锌水平、球虫感染因素有关.单胃动物对饲粮锌的利用受许多饲粮因素影响,饲粮的钙水平是其重要的影响因素之一.关于钙如何影响锌的利用,前人做了广泛的研究. 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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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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Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF
Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo. 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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乳酸杆菌作为益生菌广泛用于人和动物.本文综述了乳酸杆菌改善宿主健康的机制.乳酸杆菌可通过产生抗菌物质如乳酸、过氧化氢、细菌素,或者通过竞争营养或肠道黏附位点来抑制致病菌;通过诱导黏附素的分泌或阻止细胞凋亡而增强肠道的屏障功能,从而保护肠道.文章重点讨论了乳酸杆菌表面成分(表面蛋白、脂磷壁酸和肽聚糖)与肠道受体(C型凝集素受体、Toll样受体和Nod样受体),阐述了他们结合后启动免疫调节信号,调控肠道免疫功能以发挥改善健康作用的机制. 相似文献
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REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献