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沐建煜 《国外畜牧学(猪与禽)》2020,(1):68-70
氨基酸螯合铁是新型铁源添加剂,具有生物学效价高、吸收率高、化学结构稳定和利于环保等特点。本文综述了氨基酸螯合铁的定义、特点、发展应用及其在动物机体内的吸收机制,以期为高生物学效价的有机微量元素在动物营养中的深入研究与科学应用提供参考。 相似文献
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氨基酸螯合铁预混料喂猪效果试验 总被引：1，自引：0，他引：1
在现代养猪生产中 ,舍饲仔猪发生缺铁性贫血现象十分普遍。一般的解决方法是在仔猪出生 3天内肌注铁剂。这种方法操作较繁琐 ,费工费力 ,并给仔猪带来一定的应激反应。氨基酸螯合铁是新型的第三代微量元素产品 ,它具有毒性小 ,生物利用率高 ,溶解性好 ,无刺激 ,抗干扰等特点 ,被认为是一种较理想的微量元素换代产品。现代动物营养研究表明 :氨基酸螯合铁能通过胎盘和乳汁传给仔猪 ,预防缺铁性贫血。为了验证上述效果 ,设计了此次在妊娠、哺乳母猪饲粮中添加含氨基酸螯合铁预混料的饲养对比试验。1 试验材料与方法1 .1 供试材料1 .1 .1 4… 相似文献
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1产仔前后母猪补饲氨基酸螯合铁
近年来，国内外许多学者开展了有关氨基酸螯合铁预防仔猪贫血效果及相关机理的研究，期望通过给围产期和产后早期母猪补饲氨基酸螯合铁，增加出生仔猪的铁贮含量和乳中铁含量。这些研究者的试验设计其共同之处是，试验组母猪产前至产后数周饲喂一定剂量的氨基酸螯合铁，仔猪生后不注射任何铁剂； 相似文献
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蚯蚓对金属元素具有富集作用.为探究微量元素在蚯蚓体内存在形式和含量,利用火焰原子吸收光谱法测定蚯蚓体内铁、铜、锰、锌四种微量元素的总含量和氨基酸螯合态含量.结果表明,蚯蚓体内铁、铜、锰和锌四种元素以氨基酸螯合态形式存在比例达到65%以上,其中氨基酸螯合铁含量为400.45 mg/kg,占铁总含量的86.54%;氨基酸螯合铜含量为13.49mg/kg,占铜总含量的67.50%;氨基酸螯合锰含量为18.65 mg/kg,占锰总含量的65.79%;氨基酸螯合锌含量为358.19 mg/kg,占锌总含量的93.97%. 相似文献
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氨基酸螯合铁对早期断奶仔猪内脏铁含量及铁消化率的影响 总被引：1，自引：0，他引：1
为了比较氨基酸螯合铁对早期断奶仔猪内脏铁含量、铁表观消化率的影响,选择150头21日龄断奶仔猪(杜×长×大),在基础日粮添加100 mg/kg无机铁的基础上分别添加0、40、80、120、160 mg/kg氨基酸螯合铁构成5个试验组进行1～3周、4～6周及全期试验.结果表明:第21天和第42天,120 mg/kg氨基酸螯合铁试验组铁表观消化率极显著高于对照组(P<0.01);肝脏铁、脾脏铁都显著高于对照组(P<0.05).添加氨基酸铁螯合铁可提高早期断奶仔猪的铁表观消化率,增加体内铁贮. 相似文献
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氨基酸螯合铁和锌在畜禽生产中的研究与应用概述 总被引：1，自引：0，他引：1
对氨基酸螯合铁和锌的营养特性和可能的作用模式作了简洁的概述;对氨基酸螯合铁和锌在动物生产中的应用和作用效果进行了总结;提出了在实际生产中使用氨基酸螯合铁和锌应注意的问题及其解决方案,以期为这个领域的进一步深入研究提供理论参考. 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