共查询到20条相似文献，搜索用时 656 毫秒
1.
１饲料干燥的目的和方法饲料干燥的目的就是除去饲料原料中多余的水分 ,以便于包装、运输、储藏、加工和使用。干燥是一个复杂的过程 ,不同的干燥对象有不同的干燥方法 ,所以必须根据饲料的不同组成和特性 ,来确定合理的干燥方法。干燥机的分类方法很多 ,按干燥机的结构不同分类 ,常用的干燥机有 :喷雾干燥机、流化床干燥机、气流干燥机、回转圆筒干燥机、滚筒干燥机、红外线干燥机、高频干燥机等。这些干燥机在饲料干燥工业中得到了广泛地应用 ,大大地支持了饲料工业的发展 ,其结构及工作原理都已被我们所熟知。本文将介绍几种新兴的干燥方… 相似文献
2.
饲料干燥的目的就是除去饲料原料中多余的水分，以便于包装、运输、储藏、加工和使用。干燥是一个复杂的过程，不同的干燥对象有不同的干燥方法，所以必须根据饲料的不同组成和特性，来确定合理的干燥方法。干燥机的分类方法很多，按干燥机的结构不同分类，常用的干燥机有：喷雾干燥机、流化床干燥机、气流干燥机、回转圆筒干燥机、滚筒干燥机、 相似文献
3.
4.
5.
6.
7.
紫花苜蓿常用的干燥加工方法 总被引：3，自引：0，他引：3
苜蓿的干燥方法主要有3种，即自然干燥法、人工干燥法和物理化学干燥法。自然干燥法不需要特殊的设备，成本较低，但易受自然气候条件的制约，而且劳动强度大、效率低，调制的干草质量较差。人工干燥法则是利用一定的干燥设备来调制干草的方法，该方法可以克服自然干燥法对天气状况的依赖，并减少微生物、生理生化过程、雨淋及枝条折断等因素对干草质量的影响，但人工干燥法的成本较高。 相似文献
8.
《青海畜牧兽医杂志》2021,51(4)
青贮与青干草加工是目前人工饲草生产常用的两种调制方法。高寒地区青干草的制备能够有效缓解草畜压力,促进区域畜牧业的发展。本文从青干草的干燥过程及原理、干燥方法等方面进行分析与探讨,发现高寒地区青干草的干燥方法研究仍然较少,而高寒地区燕麦青干草的干燥方法研究更少,需要我们深入研究。 相似文献
9.
10.
1鸡粪处理方法 1.1脱水干燥处理 新鲜的鸡粪主要成分是水,通过脱水干燥处理,使鸡粪的含水量降到15%以下,这样,一方面减少了鸡粪的体积和重量,便于包装运输及应用;另一方面可有效地抑制鸡粪中微生物的活动,减少营养成分特别是蛋白质的损失. 相似文献
11.
12.
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
13.
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.
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
16.
17.
18.
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
19.
20.
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