共查询到20条相似文献，搜索用时 781 毫秒
1.
为解决酶法测定饲料中淀粉总含量实际检测中遇到的问题,对粉碎粒度、振荡速度等参数进行了优化,对淀粉葡萄糖苷酶（AMG）的选用、AMG添加量的确定方法等问题进行研究和补充,并且研究了方法对含β-葡聚糖样品的适用性。结果显示,使用样品粉碎度为通过0.425mm筛;振荡速度为150 r/min;选用不含游离葡萄糖的AMG;并经酶活检测,确定酶的正确添加量后,方法 RSD在0.7%～2.7%之间,加标回收率在90.7%～103.6%之间,具有良好的精密度和准确性,适用于饲料原料、配合饲料、精料补充料、浓缩饲料中淀粉总含量的检测。样品中含有的β-葡聚糖对方法测定结果没有显著影响。 相似文献
2.
3.
4.
试验旨在研究使用新玉米对饲料中抗性淀粉（RS）含量的影响。收集5家饲料厂的新玉米样（共计30个）、陈玉米样（共计20个）以及用新玉米和陈玉米搭配而加工的配合饲料样（共计158个）,测定玉米、配合饲料制粒前、制粒后RS含量。结果表明：新玉米中RS含量为1.10%～3.03%,平均含量为2.33%;陈玉米中RS含量为0.74%～3.48%,平均含量为2.28%;制粒前饲料中RS含量为0.58%～1.64%,平均含量为1.07%,制粒后饲料中RS含量为0.5%～1.21%,平均含量为0.78%,低于制粒前含量（P<0.05）。由此可见,使用新玉米不会导致饲料中RS含量升高,而制粒会显著降低饲料中RS含量,新玉米以及使用新玉米生产的饲料中抗性淀粉整体水平较低,与新玉米对畜禽造成的不利影响可能无关。 相似文献
5.
为了提高复方中草药中有效成分的含量，试验以解淀粉芽孢杆菌与干酪乳杆菌两种益生菌为菌种，固态发酵含有益母草、黄芪、当归等中草药组成的复方中草药饲料添加剂作为试验组[按中药发酵基料2%接种量(V/W)接种发酵菌株种子液],对照组接种2%(V/W)的空白培养基，采用亚硝酸钠-硝酸铝-氢氧化钠比色法，以芦丁作为对照品，测定总黄酮含量；采用苯酚-硫酸比色法，以葡萄糖作为对照品，测定多糖含量；采用雷氏盐比色法测定总生物碱的含量，考察方法的精密度、稳定性、重复性及回收率，比较复方中草药饲料添加剂经混合益生菌发酵后中草药活性成分的变化。结果表明：复方中草药中总黄酮、多糖、总生物碱的有效成分提取方法的精密度、稳定性、重复性及回收率均符合方法学验证要求。试验组与对照组中草药中总黄酮的含量分别为(3.085±0.005)mg/g和(2.175±0.005)mg/g,多糖的含量分别为(47.966±0.006)mg/g和(25.216±0.006)mg/g,总生物碱的含量分别为(3.752±0.002)mg/g和(3.032±0.002)mg/g,试验组总黄酮、多糖及总生物碱的平均含量均极显著高于对照组(P&... 相似文献
6.
国家标准GB6432-86是利用凯氏定氮法测定饲料中粗蛋白的含量。一些不法分子在饲料中掺入尿素,以此来提高饲料中总氮含量,这就给测定饲料中粗蛋白质的真实含量带来困难。饲料中尿素含量没有标准的检测方法。在长期的工作实践中,我发现二乙酰肟比色法测定尿素含量较为可靠。现介绍如下： 相似文献
7.
8.
9.
不同方法测定反刍动物饲料NDF、ADF和木质素含量的比较 总被引：4，自引：0，他引：4
采用传统抽滤、ANKOM滤袋和CAU滤袋技术测定16种反刍动物饲料的中性洗涤纤维(NDF)、酸性洗涤纤维(ADF)和木质素(PL,高锰酸钾法)含量。结果表明:3种方法测定的大部分饲料的NDF、ADF和PL含量间没有差异(P>0.05),但在测定谷物性饲料NDF含量时,ANKOM滤袋技术测定值明显低于其他2种方法(P<0.05);在测定动物性蛋白质饲料时,CAU滤袋测定的NDF值明显高于其他2种方法(P<0.05)。3种方法测定的NDF、ADF和木质素含量均具有显著的线性相关关系(R2=0.990～0.996),其中2个滤袋技术测定值之间的相关程度最高(R2=0.992～0.996);2个滤袋技术测定值的变异系数(CV=2.20%～3.96%)均小于传统抽滤(CV=3.21%～4.91%)。 相似文献
10.
《中国畜牧杂志》2017,(5)
本试验旨在研究饲料淀粉预糊化对中华鳖(Pelodiscus sinensis)糖代谢过程中部分关键酶活性的影响。试验选择256只稚鳖,随机分成4组,每组8个重复,每个重复8只。用生淀粉替代鳖用饲料中常用的预糊化淀粉,在等氮、等能条件下,设置4种总淀粉含量相同(20%)、替代比例不同的试验饲料,分别饲喂4组中华稚鳖。饲料1的生淀粉替代预糊化淀粉比例为100%(20%的生淀粉+0%预糊化淀粉)、饲料2为67%(13.4%的生淀粉+6.6%预糊化淀粉)、饲料3为33%(6.6%的生淀粉+13.4%预糊化淀粉)、饲料4为0%(0%的生淀粉+20%预糊化淀粉)。进行7周生长试验后,测定不同饲料组稚鳖的血液指标、肝糖原和肌糖原含量以及一些糖代谢酶的活性。结果表明:生淀粉替代预糊化淀粉的比例超过67%时,稚鳖的血糖水平显著增加(P0.05);生淀粉完全替代预糊化淀粉,稚鳖的肌糖原、肝糖原、肝和肌肉组织5种糖代谢酶活性(丙酮酸激酶、己糖激酶、果糖-6-磷酸激酶、6-磷酸葡萄糖脱氢酶和磷酸烯醇式丙酮酸羧化酶)均无显著差异(P0.05)。由此可见,淀粉预糊化对稚鳖糖类的分解代谢没有影响。 相似文献
11.
12.
13.
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
14.
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
15.
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.
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
18.
19.
20.
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