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微生态制剂对刺参养殖的影响 总被引:1,自引:0,他引:1
《饲料工业》2017,(14):29-34
研究旨在探究微生态制剂在刺参养殖中的效果。在饵料中添加微生态制剂,分别研究了EM菌和饵料的配合比例以及混合时间对刺参生长率、肠道4种消化酶以及养殖水质的影响。研究发现,EM菌与饵料配合比例为21时,幼参5 d的生长率可提高到4.23%,高于对照组的2.92%;肠道内容物中的酶活依次为蛋白酶活性45.11 U/g、纤维素酶活性2.13 U/g和褐藻酸酶活性3.34 U/g,肠壁的淀粉酶活性为4.05 U/g;养殖水体中亚硝态氮、氨氮含量达到最低,分别为0.032 mg/l和0.478 mg/l。EM菌与饵料混合8 h,5 d的生长率最高达到5.41%,高于对照组的4.01%;肠道内容物中的酶活依次为蛋白酶活性46.09 U/g、纤维素酶活性2.23 U/g和褐藻酸酶活性3.33 U/g,肠壁淀粉酶活性为4.23 U/g;养殖水体中亚硝态氮、氨氮含量最低,分别为0.070 mg/l和0.670 mg/l。EM菌的使用方式对刺参养殖有影响,合理使用将更能体现出微生态制剂的功效。 相似文献
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微生物水质净化剂在集约化水产养殖业中,作为生物防治方法用来改良水质,已取得了显著效果。综述了微生物水质净化剂的作用机理、应用现状,并介绍了科学使用方法。 相似文献
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筛选乳酸杆菌优良菌株的研究 总被引:3,自引:0,他引:3
作为抗生素的可能替代品,益生素日益引起人们的重视。目前我国已有不少益生素饲料添加剂产品投放市场,但无论是产品本身质量,还是使用效果仍不尽如人意,归纳起来主要有以下几方面:1)受环境条件(温度、水分、酸碱度等)的影响,益生素产品中的活菌在生产、运输中易失活,从而降低使用效果;2)加工的高温过程,使大量的活菌有效成分失活;3)饲料中添加的或在治疗过程中使用的抗生素和化学合成抗菌剂,对益生菌同样具有杀灭或抑制作用;4)进入消化道后不能有效抵抗胃酸、胆盐等的作用,无法长时间定植肠道发挥其功效;5)对动物… 相似文献
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活菌制剂改进猪氮转化和减少猪舍氨气的研究 总被引:5,自引:0,他引:5
试验在两条万头猪生产线的生长猪舍内同步进行,在生长猪正常日粮中添加0.05%的活菌制剂,添加前和持续添加10d后,分别测定猪舍内氨气含量和粪便,尿中总氮和氨氮的浓度,结果表明,连续使用活菌制剂10d后,两条线舍内氨含量分别降低了40.28%,和56.46%,尿中总氮和氨氮降低25%-38%,差异显著;粪中总氮和氨氮差异不显著。 相似文献
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利用载菌硅酸盐进行了净化甲鱼池塘养殖水质的研究,结果表明,载菌硅酸盐结合了附载材料硅酸盐和复合有益菌株各自的优势,在甲鱼养殖池塘水体中添加,通过吸附和转化、降解等作用可以显著降低水体中氨氮、亚硝酸盐氮、硝酸盐、硫化物和COD的浓度(P<0.05),但对pH值的影响不显著,试验结果为甲鱼池塘养殖水质净化提供了一个新的思路。 相似文献
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一种水产养殖用微生物制剂的研究 总被引:1,自引:0,他引:1
利用枯草芽孢杆菌、干酪乳杆菌、沼泽红假单胞菌和啤酒酵母4种菌株配制了一种复合微生物制剂,试验结果表明,该制剂除含有丰富的营养成分外,在水产养殖中还能起到净水剂的作用,它能增加水中的溶解氧,显著降低氨氮、亚硝态氮、硫化物等不利于水产养殖的污染成分。此微生物制剂在水产养殖中将能发挥营养、保健及净化水质的功效。 相似文献
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本文对科研中的几个热门研究(利用多准则分析研究饲养模式;利用表观回肠消化率和标准回肠消化率预测肉鸡混合日粮中氨基酸消化率的效果;肉用鹌鹑成肌素基因多态性分析;鸡更喜欢自然光照还是人工光照;巴西肉鸡场空肠弯曲杆菌的脉冲场凝胶电泳和耐药性分析;鸡粪的含氮量及其与饲料营养物质含量的关系;水热处理温度条件对禽肉品质的影响;尼日利亚家禽养殖场沙门菌抗菌药物的使用与耐药性的相关性分析;添加霉菌毒素吸附剂对图卢兹鹅实验性黄曲霉毒素中毒的评价;肉鸡的早期饲养方法;混合有机酸对蛋鸡生产性能和蛋品质的影响;甜菜碱可降低血浆同型半胱氨酸浓度并提高骨骼强度)进行了简要概述,希望能为科研工作者和养殖者提供技术支持。 相似文献
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本文提出的水质分析盒,配有各种试剂与标准色卡,可及时测定水中溶解氧、氨氮、亚硝酸盐和硫化氢,并有检验氯消毒剂质量的方法。该分析盒的特点:简便快速,易于掌握,准确可靠,养殖人员在现场能监测池水中溶解氧及有害物质的含量。 相似文献
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在水产养殖中使用微生物活菌制剂应注意的问题 总被引:1,自引:0,他引:1
近年来,为了改善养殖池塘的水质和预防水产养殖动物的疾病,在水产养殖业中各种微生物制剂的应用越来越多。目前,市场上销售的微生物活菌制剂大概可以分为几大类:从微生物种属上划分,有光合细菌、芽胞杆菌、硝化细菌、反硝化细菌、酵母菌、乳酸菌、硫化细菌等;从产品剂型上划分,有水 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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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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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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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