共查询到20条相似文献，搜索用时 93 毫秒
1.
饲料粉碎技术研究新进展 总被引：4，自引：0，他引：4
粉碎是饲料加工生产过程中重要工序之一，粉碎作业涉及到饲料加工成本（电耗、易损部件）、重量损耗（水分和粉尘）、混合、颗粒饲料质量、畜禽鱼的生产性能和家畜的健康（溃疡）（KeithC．Behnke，１９９９）、操作环境的改善（粉尘、噪声）。因此，饲料粉碎技术改进对提高饲料生产效率、饲料产品质量和降低生产成本有着重要的经济意义，也是许多研究人员一直探索的课题。研究主要内容有粉碎效率的提高、合理的粉碎工艺、粉碎机结构、粉碎机电耗、粉碎机操作的方便性、粉碎粒度的大小和均匀性、易损部件的耐磨性、粉碎机噪声的控制、粉碎… 相似文献
2.
<正> 饲料加工中,电耗约占加工成本的10％左右,其中粉碎电耗又将占粉状成品加工总电耗的60～70％,是饲料加工中主要耗电工序。成品饲料的粒度粗细不仅影响饲料加工的电耗,而且还影响畜禽的消化吸收及健康生长。所以,粉碎工艺是饲料加工中的重要工序。目前,国内的饲料加工厂一般都是采用粉碎机一次粉碎成粉的“一次粉碎”工艺。这种工艺较简单,但是,成品细度不均,电耗较高、单产低、粗细度不易保证。这些问题已被 相似文献
3.
《北方牧业》2006,(5)
<正> 一个好的饲料产品,需要三个方面的保证:一是优秀的配方,二是优质的原料,三是优良的加工工艺。由于原料实际品质、实际加工过程与预期的理论分析存在差异而导致生产的产品不能如实反应配方的品质,使配方失真,这种现象在饲料厂极为常见。1 粉碎因素原料粒度决定着饲料组成的表面积,原料粒度越细,各种原料粒之间的接触面越大,越易结合。各种原料粒度越一致,可为后道混合工序的优质混合提供保障。饲料原料粉碎越细,也越有利于动物的消化吸收,提高饲料转化率,但在实际工作中,粉碎后,粉末颗粒并不均匀,例如采用63.0毫米筛孔筛片粉碎,产品小于25微米的粒子约占总量的15%,产品大于1毫米的粒子约占25%。粉碎后粒度的均匀度不一致,致使在物料混合中,分级现象严重。 相似文献
4.
5.
6.
7.
粉碎是饲料加工的重要工序，其粉碎量占原料的60％～70％，粉碎能耗占饲料加工总能耗的30％以上，因此，合理配置粉碎机辅助吸风系统以提高粉碎效率，是目前饲料厂降低饲料加工成本、提高加工质量的有效手段。 相似文献
8.
饲料加工工艺对营养物质利用率及畜禽生产性能的影响 总被引：1，自引：0，他引：1
高品质的饲料产品不仅取决于配方好坏、原材料的优劣，同时加工工艺也起着重要的作用。饲料在加工过程中会发生一系列物理、化学变化，从而影响饲料中各种营养成分的利用率，以及动物的生产性能。本文从饲料粉碎粒度、混合均匀度、膨化与否、制粒效果方面对营养物质利用率、畜禽的生产性能都有不同程度的影响作一综述。 相似文献
9.
10.
饲料加工是一个较为复杂的过程,尽管加工工艺通常都包括粉碎、混合、成型这些基本工序,但具体的工艺布置和加工参数都应根据饲料种类和所用的饲料原料作相应调整,因为不同的原料配方对成型饲料的生产性能有很大的影响。其中,原料特性包括物料的容重、粒度、含水量、粘结性、摩擦性和腐蚀性等。这些因素都影响着饲料产品质量和加工设备生产能力。因此,在饲料配方中,要适当考虑饲料原料特性,调整配方使之具有较好的制粒性能。而在加工工艺上,则要根据不同饲料原料和配方,选择合理的加工方法。本文根据饲料配方中淀粉、蛋白质、纤维、脂肪这几种成分在饲料中所占比例对饲料进行分类,探讨不同类型饲料的加工工艺及适宜的加工方法。 相似文献
11.
12.
Beran GW 《Preventive veterinary medicine》2008,86(3-4):198-207
When early people made their appearance, zoonotic infectious diseases were already waiting, but epidemic diseases did not appear in human history until people began to live in large numbers under conditions of close contact, mainly during the last 10,000 years. Disease has decimated urban populations, conquered armies, and disrupted society. The focus here is on (1) the plague of Athens and the Black Death; (2) smallpox, influenza, and rabies; (3) avian influenza prion diseases, and foot & mouth disease; and (4) emerging and re-emerging diseases. All have veterinary public health associations. In Athens, Greece, in 430 BC, when the Spartans ravaged the countryside, hordes crowded into Athens so that orderly movements, space in which to live, and adequate supplies of food became impossible. Crowding of any population fosters disease transmission; chaos and disorder enhance it all the more. Out of northern Egypt came a terrible plague from across the Mediterranean Sea. The identity of the plague of Athens remains unsure, but the well-considered conclusion is Rift Valley Fever, a mosquito borne, viral zoonosis. The Black Death, also called the Plague, raged in Asia for centuries. In 1347, the Black Death was brought by a ship out of Asia to Sicily. The scenes of devastation were repeated throughout Europe, with 90% or more of the people dying in city after city. Influenza, too, has been a cause of periodic human epidemics, but the great pandemic of influenza occurred in the last months of World War I. In the years of highest occurrence, more than half the world's population became clinically infected. If veterinary public health had been born earlier, it could have led to elucidating the epidemiology of influenza and the plagues of Athens, Europe, and Asia. In turn, smallpox had also caused continual tragedy. In 1796, Edward Jenner began to harvest pustules of cowpox from children or infected cows and inject them into susceptible children. In 1980, the World Health Organization declared that smallpox had been eliminated from the world. Rabies, though, still strikes terror. A number of animal diseases, broadly termed emerging and re-emerging diseases, need surveillance because they have the potential to impact human health. From late in 2003 to 2007, the highly pathogenic H5N1 influenza virus in poultry infected at least 121 people and caused 62 deaths in four countries. The prion diseases, too, all have very high numbers in concentrated contacts. To control these diseases, veterinary public health is essential, with diagnosis, epidemiological surveillance, clinical manifestations, and prevention as primary measures. 相似文献
13.
Dekker A Dercksen D Snoep J van Wuyjckhuise L 《Tijdschrift voor diergeneeskunde》2007,132(18):695-701
On 26th of july 2007 a new case of bluetongue was notified in the Netherlands and on 2nd of august 2007 foot-and-mouth disease was diagnosed in Surrey, England, which raised the threat of having both infections simultaniously in one area. Bluetongue and foot-and-mouth disease have a different pathogenesis, but symptoms may resemble each other at a later stage of infection. The pathogenesis and possible clinical symptoms of both infections are discussed and illustrated with pictures. 相似文献
14.
15.
在动物的异常行为中以刻板行为最为常见,而咽气癖又是马最常见的口部刻板行为之一。作者就咽气癖在生理方面和心智方面对马体产生的影响、行为基础、诱因的研究进展及常见的防治措施进行综述。 相似文献
16.
17.
18.
19.
