共查询到20条相似文献,搜索用时 78 毫秒
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虽然南非养殖鸵鸟已有150余年的历史,但作为养殖业的兴起与发展只是近20余年的事,目前至少已有50多个国家和地区在发展鸵鸟养殖业.饲养量超过250万只,年屠宰60—75万只。其中南非存栏鸟约150万只,有专业屠宰场8家,年屠宰鸟约40万只,为世界提供一半以上的鸵鸟产品,并向世界出口育成的非洲黑种鸟和技术、设备;纳米比亚有存栏鸟6万—10万只,饲养万只以上的 相似文献
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我国鸵鸟养殖产业的现状、发展前景与思考 总被引:1,自引:0,他引:1
摘要:近20年来,世界鸵鸟养殖产业发展甚快,非洲的南非、纳米比亚、津巴布韦等国已成为鸵鸟产品的主要出口国家,既出口种鸟,更多的出口鸵鸟肉和皮。目前世界上已有42个国家和地区饲养驯养鸵鸟,约有200万-250万只,年屠宰60万-75万只。消费市场主要在欧洲国家和美、加、日、韩及台港地区,由于受疯牛病、口蹄疫的侵袭,牛、羊、猪肉受到影响,导致了鸵鸟肉要求量成倍增长,价格持续上扬。 相似文献
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一种巨型高贵的特种禽─—鸵鸟韩刚,陈锦农(华南农业大学)在自然界中最大的鸟类为鸵鸟,它最早被驯化于非洲。澳大利亚鸵鸟,在世界上也享有名望。据报道,南非饲养鸵鸟已有80多年的历史,目前饲养鸵鸟数高达20多万只。津巴布韦和中美洲等国家,不仅建有上千只规模... 相似文献
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《河南畜牧兽医(综合版)》2000,(6)
据新华社报道韩国将在2个月内制定并实施有关允许食用鸵鸟肉的规定。韩国有关部门说,随着这一规定的实施,要防止国内饲养和繁殖出现过热,同时要注意国外鸵鸟肉大量涌入。韩国农林部和鸵鸟协会的统计说,韩国进口的鸵鸟(包括鸵鸟蛋)1997年为685只,1998年增加到4248只,去年大幅度增加到1.22万只。而韩国目前有800多农户在饲养着2万多只鸵鸟。目前在韩国国内市场上,一只3个月大的鸵鸟价格为70万韩元(1100韩元合1美元),3年以上的鸵鸟价格为600万~1500万韩元。鸵鸟肉的价格每公斤为3万韩元,与日本… 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