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为了探索微量元素对妊娠母羊营养状况的影响,选取体重相近、年龄和胎次相同的卡拉库尔羊妊娠母羊和空怀母羊各6只,清晨采取颈静脉血样和臀部毛样,利用原子吸收光谱法对铜、锌、铁、锰4种微量元素含量进行了测定(国标法)。结果表明:血清中,铜的含量在妊娠母羊与空怀母羊之间差异显著(P<0.05);全血中,铁、铜、锰含量在妊娠母羊与空怀母羊之间差异显著(P<0.05);羊毛中,铜、锰含量在妊娠母羊与空怀母羊之间差异显著(P<0.05)。 相似文献
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为了探索微量元素对妊娠母羊营养状况的影响,试验选取体重相近、年龄和胎次相同的卡拉库尔妊娠母羊和空怀母羊各6只,采集颈静脉血样和臀部毛样,利用原子吸收光谱法(国标法)测定铜、锌、铁、锰4种微量元素含量。结果表明:血清中铁、铜含量在妊娠母羊与空怀母羊之间差异显著(P<0.05);全血中铁、锰含量在妊娠母羊与空怀母羊之间差异显著(P<0.05),铜含量差异极显著著(P<0.01);羊毛中铜含量在妊娠母羊与空怀母羊之间差异显著(P<0.05),锰含量差异极显著(P<0.01);与我国绵羊饲养标准相比,全血中的铜、锌含量较低,铁、锰含量较高。 相似文献
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在SPF屏障系统内,给清洁级KM小鼠在日粮中添加一定量的鸡蛋和葵花籽,采用原子吸收光谱法测定血清中5种微量元素,进行统计学分析。结果表明,对照组的雌雄KM小鼠血清中微量元素锌、铁、镁含量比较差异具有显著性(P<0.05),实验组的雌雄KM小鼠血清中微量元素铜、铁含量比较差异具有极显著性(P<0.01)。组别间雄性小鼠进行比较,锌含量比较差异具有显著性(P<0.05),铁、钙含量比较差异具有极显著性(P<0.01);组别间雌性小鼠进行比较,铁、钙含量比较差异具有极显著性(P<0.01)。结果提示,雌雄间血清中部分微量元素含量差别较大。经常食用鸡蛋、葵花籽等天然食品,可提高体内一些必需微量元素的含量。 相似文献
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青贮饲料中镁、锰、锌、铜测定的前处理方法比较仲宗根一哉,川本康博,古田贤治关键词青贮饲料,微量元素,前处理方法前言通常测定植物中无机成分含量时多数元素都采用原子吸收法。原子吸收的定量分析主要是有机物分解的前处理方法。一般是把干燥后粉碎的样品用硝酸──... 相似文献
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试验对市场上流通的家兔商品全价配合饲料进行采样,采用原子吸收光谱仪测定微量元素铁、铜、锌、锰含量,按幼龄兔、生长兔和母(种)兔等不同生理阶段以及肉用兔、獭兔和长毛兔等不同经济用途进行分类统计,探讨不同生理阶段和不同经济用途家兔全价配合饲料中微量元素铁、铜、锌、锰含量,为我国饲料企业生产家兔全价配合饲料时微量元素的添加提供参考。结果表明:微量元素铁、铜、锌、锰在家兔商品全价配合饲料中平均含量分别为689、38、94、107 mg/kg,明显高于美国NRC(1977),法国INRA(1989)和法国AEC(1993)以及国内相关研究报道。试验表明,不同生理阶段家兔和不同经济用途家兔微量元素铁、铜、锌和锰存在一定差异性,幼龄兔和母(种)兔高于生长育肥兔,獭兔和长毛兔高于肉用兔。 相似文献
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预混合饲料中铜、铁的快速连续测定 总被引:1,自引:0,他引:1
GB/T 1 3885 - 1 992规定了用原子吸收分光光度计测定预混合饲料中铁、铜、锰、锌、镁的方法 ,但大多数预混合饲料厂都没有原子吸收检测设备 ,因此不能对铜、铁等微量元素预混合饲料进行有效的控制和检验。我们通过试验 ,摸索出了一种预混合饲料中铜、铁的快速连续测定方法———化学滴定法 ,并与原子吸收检测结果比较 ,两者误差铜在 1 0 %范围之内 ,铁在 5 %范围之内。1 原理在碱性氨溶液中 ,铜能形成Cu(NH3) 2 +2 络合离子而进入溶液 ,铁则形成氢氧化铁沉淀。过滤试液 ,进入滤液的铜可用碘量法来测定 ,然后用稀盐酸来溶解沉淀物 ,… 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: 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
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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