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添加剂预混料作为配合饲料的核心成分,其质量的优劣直接关系到配合饲料的质量和畜禽渔的生产性能及人类的健康,是发展饲料工业和养殖业的关键技术之一。在添加剂预混料的生产中,除了对饲料和成品进行正常的检测控制外,生产过程中的监督控制是预混料质量控制中的重要环... 相似文献
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生产过程中预混料质量的监控 总被引:1,自引:0,他引:1
沈永昌 《广东畜牧兽医科技》1999,(1)
添加剂预混料作为配合饲料的核心成分,其质量的优劣直接关系到配合饲料的质量和畜禽渔的生产性能。在添加剂预混料的生产中,除了对原料和成品进行正常的检测控制外,生产过程中的监督控制是预混料质量控制中重要的环节,而且也是实施质量保证制度的关键。我国现有添加剂... 相似文献
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添加剂预混料质量的好坏直接关系到配合饲料的饲喂效果和养殖业的经济效益 ,因此受到人们的普遍关注。而维生素是预混料的主要成分 ,在预混料总成本中 ,维生素成本约占 5 0 %以上。由于动物生产性能的提高 ,高产动物品种免疫力的下降 ,饲料加工贮存过程中维生素的损失 ,以及动物对维生素需要量的增加等原因 ,配合饲料中维生素的添加量呈逐步提高的趋势。但配合饲料中维生素的适宜添加量 ,目前尚无统一的标准 ,从而使饲料配方设计者感到无所适从。为探索肉用畜禽预混料及配合饲料中各种维生素的适宜添加量 ,笔者对国内添加剂预混料中维生素的… 相似文献
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复合预混料生产技术要点 总被引:2,自引:0,他引:2
近年来复合预混料已由工厂内部使用的半成品迅速转变为商品性饲料 ,对我国配合饲料的普及、饲料成本的降低 ,起到了很大推动作用。复合预混料的加工 ,有其自身的特点和要求 ,现就此作一简述。1 复合预混料的生产要求复合预混料是指多种微量元素、多种维生素和 (或 )饲料药物添加剂、氨基酸等微量组分与载体或稀释剂均匀混合而成的配合饲料核心组成产品。其原料主要为饲料添加剂 ,组分极其复杂、品种多、理化性能差异大。在此基础上市场上又衍生出包含Ca、P、NaCl、动物蛋白的小比例浓缩料。1 1 配方科学 预混料是配合饲料的核心 … 相似文献
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将 2 4头三元杂交 (杜×长×大 )断奶仔猪随机分成 2个处理组即试验组 (绿色添加剂预混料组 )和对照组 (所用添加剂预混料为市场常见的知名品牌 ) ,每个处理组设 3个重复 ,每个重复 4头(公母各半 ) ,试验期 2 0d。用以测定该种绿色添加剂预混料的饲用效果。试验结果表明 ,试验组仔猪的平均日增重和饲料利用率分别比对照提高 9 3% (P <0 0 5 )和 5 5 % (P <0 0 1) ,经济效益提高14 2 %。说明该种绿色添加剂预混料对仔猪的生产性能具有良好的促进作用。 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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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
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乳酸杆菌作为益生菌广泛用于人和动物.本文综述了乳酸杆菌改善宿主健康的机制.乳酸杆菌可通过产生抗菌物质如乳酸、过氧化氢、细菌素,或者通过竞争营养或肠道黏附位点来抑制致病菌;通过诱导黏附素的分泌或阻止细胞凋亡而增强肠道的屏障功能,从而保护肠道.文章重点讨论了乳酸杆菌表面成分(表面蛋白、脂磷壁酸和肽聚糖)与肠道受体(C型凝集素受体、Toll样受体和Nod样受体),阐述了他们结合后启动免疫调节信号,调控肠道免疫功能以发挥改善健康作用的机制. 相似文献