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研究当前饲料厂常用的几种混合机的结构、混合特性及对混合参数的比较,得出结论认为:卧式双轴桨叶式混合机和卧式双螺带混合机是生产配合饲料的较佳机型,其中前者是首选机型。卧式双轴桨叶式混合机、立式双螺带混合机(SCH)和立式悬臂非对称栓螺旋混合机(DSH)均可用于混合预混料,但各有优缺点。卧式犁刀式混合机因其残留率过大,不适合于混合预混料。 相似文献
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分别在4、5、6、7、8min混合时间各取10个样,以比色法测定各样本的铁含量,求变异系数,以确定卧式混合机混合预混料的最佳时间.结果表明4min的变异系数较高,没有达到预期的混合均匀度,最佳混合时间以5min为宜. 相似文献
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《经济动物学报》2017,(3)
全价混合日粮(Total mixed ration,TMR)的制作是奶牛饲养技术的关键,而混合均匀度是全价混合日粮重要的评价指标。本试验通过示踪物小麦不同的添加量水平、不同的搅拌时间、不同的采样点对奶牛的日粮进行混合均匀度和颗粒度测定。结果表明:搅拌机不同搅拌时间8 min、12 min和16 min对奶牛TMR混合均匀度差异不显著(P0.05),但8 min组的整齐度要优于12 min和16 min组,平均的混合均匀度8 min组也要高于12 min和16 min组;1%小麦添加量传送带和料车奶牛TMR的混合均匀度差异不显著(P0.05),但4%小麦添加量组中8 min传送带样本与料车差异显著(P0.05)。而1%和4%小麦添加量组饲槽TMR的混合均匀度均显著低于搅拌8 min时传送带上TMR的混合均匀度(P0.05)。本研究首次以小麦为奶牛全价混合日粮的示踪物,为奶牛全价混合日粮混合均匀度检测方法、考察搅拌机的混合性能和确定最佳混合时间提供了依据。 相似文献
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饲料厂的混合系统大都采用双轴桨叶高效混合机,它较之卧式螺带混合机显示出高效、柔和、高混合均匀度、油脂添加量大、残留小、物料充满系数对混合均匀度影响小等优点。但在制造、使用与维护方面仍然存在一些不足。为此,我们在设计时对此作了改进。1原双轴桨叶高效混合机的结构特点用一台减速器通过一根链条带动两根桨叶主轴旋转,两根主轴上的桨叶对称布置;大开门放料机构;混合室与混合机出口有一连通风管。这种混合机在超负荷时,或者混合室内突然进入异物时,就有可能对桨叶主轴、桨叶杆、减速器、链条、电机等造成损坏;同时链条对主轴轴头… 相似文献
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研究旨在探讨腰鼓型混合机和V型混合机混合时间对混合均匀度的影响,以确定满足生产实际的最佳混合时间。以扬州大学饲料厂生产的复合预混料为试验材料,采用单因子分组试验,按混合时间分7个处理组,每个处理做3个重复,每个重复取10个样品。采用邻菲罗啉比色法测定其变异系数。结果表明:在装载系数为0.42工况下,腰鼓型混合机的最佳混合时间为4 min,对应的变异系数(CV)为4.68%,混合时间对变异系数有显著影响(P<0.05)。V型混合机的最佳混合时间为11 min,变异系数(CV)为4.19%,混合时间对变异系数影响极显著(P<0.01)。实际生产中应根据不同机型选择适宜的混合时间。 相似文献
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影响饲料均匀度的因素 总被引:2,自引:0,他引:2
均匀度是指各种饲料原料在饲料中混合均匀的程度,是混合工艺质量的一项重要指标。配合饲料混合均匀度的高低,会直接影响畜禽的饲养效果。黑龙江省生产畜禽预混料、浓缩料占的比例较大,而生产企业又以小企业为多,设备落后,有的甚至用人工搅拌的方式生产预混料或浓缩料,很难混匀。影响饲料均匀度的因素及应采取的措施如下:1 混合设备混合机(预混机)是制作预混料的关键设备,种类很多。一般认为双螺带卧式混合机的混合效率较好。混合机主轴上的转子有螺旋叶片,分为双螺旋环带式和三螺旋环带式等。但在转子的顶端与混合机内壁之间的缝隙,落入物… 相似文献
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采用通过VE高效液相色谱法检测复合维生素预混料的混合均匀度,分别检测用砻糠、玉米芯粉和玉米粉作为爱保农猪用复合维生素预混料载体的产品混合均匀度,通过高效液相法检测混合机中各点VE含量的差异,从而确定复合维生素预混料的最佳载体. 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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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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家兔作为一种实验动物 ,推动了繁殖技术的发展。本试验通过对不同年龄公獭兔的睾丸进行组织学观察、测定 ,研究精子的发生规律 ,为系统地进行繁殖生理工作提供依据。1 材料与方法选 60日龄、75日龄、90日龄 3个年龄公獭兔各5只 ,用外科手术法摘取两侧睾丸 ,放入 Bouin氏液中固定 ,二甲苯透明 ,石蜡包埋 ,切成 5~ 8μm切片 ,H.E.染色。在显微镜下观察 ,并进行定量组织学指标测定及差异性比较。2 结果和讨论2 .1 睾丸定量组织学指标的测定结果 见表 1。表 1 獭兔睾丸定量组织学指标 μm,个 /精细管60日龄 75日龄 90日龄曲细精管… 相似文献
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Fractures of the anconeal process of 5 pigs ranging in age from 4 to 8 months were studied radiographically and histologically. Clinically, animals with a fracture of the anconeal process had a "tight," restricted gait. In pigs at 4.5 months of age, a radiolucent line through the base of the anconeal process was composed of fibrocartilage, fibrous connective tissue, and hyaline cartilage. Subperiosteal proliferation of woven bone was located along the cranial surface of the olecranon, adjacent to the base of the anconeal process. In older animals, the radiolucent line through the anconeal process contained variable amounts of fibrous connective tissue and fibrocartilage. The proliferation of subperiosteal bone at the base of the anconeal process formed a "buttress callus" which retained a radiolucent area between the callus and the proximal surface of the anconeal process. The latter region of radiolucency was continuous with the transversely oriented line that traversed the base of the anconeal process. 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