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骆新泰 《广东畜牧兽医科技》1990,(3)
我公司领导对鸡种改良选育工作十分重视。近年来,投入了不少人力、物力,进行品种改良、选育和利用研究,旨在获得适销对路、高产、优质的黄羽肉鸡配套品种和适合香港市场需求的生长快、饲料转化率高、肉质好的黄羽肉鸡。1984年起,我们先后观察过红布罗、迪高鸡与石岐杂杂交试验,改良石岐杂和岭南黄鸡的饲养效果。现在,把1988年我场饲养岭南黄鸡的结果总结如下。1、进苗时间和数量1988年2月22日,我场从公司进雏鸡(出 相似文献
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<正> 一、前言 石岐杂是香港利用广东著名石岐地方黄鸡杂交而成的优质肉鸡商品种群,它保留广东黄鸡的体型外貌和肉香味鲜的特色,又较地方鸡种生长快,饲料报酬高,成为近年来统治港澳活鸡市场的当家品种。 但是,石岐杂种鸡在广东产卵90多枚,每只母鸡全年只能提供不足60只苗鸡。由于繁殖力低,饲养成本高,养种鸡亏本,形成每年花大量外汇进口苗鸡的被动局面,因此,迅速改变进口石岐杂苗鸡的措施是广东输港 相似文献
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优质鸡肉质评价体系的研究进展 总被引:3,自引:6,他引:3
优质鸡,起初称黄羽肉鸡,我国在上世纪的70年代末80年代初就进行了研究和育种工作。具有符合市场需求的优良肉质,同时生产性能好、生产成本低、卖价高的优质鸡种已成为育种公司现在的重大研究课题,预计未来10年优质鸡占肉鸡市场份额将达70%。这是中国优质鸡育种的一个趋向,也是加入WTO后应对外来品种冲击的一个优势。1989年在香港召开首届中国内地、香港、台湾“优质鸡的改良、生产暨发展”研讨会,2005年又在香港召开第7届研讨会,足见优质鸡的意义深远。尽管过去20年来, 相似文献
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我国的优质鸡产业始于30年前,最初优质鸡生产是为了满足香港和澳门市场的需要。然后,国内市场的需要量越来越大,刺激了优质鸡商业育种和商品生产的快速进步。近几年来,我国优质肉鸡事业得到了长足的发展,优质鸡生产总量逐年上升。目前,全国已有20余个品牌的优质肉鸡,主要分布于沿海地区,如广东、福建、江苏和上海等省市。 相似文献
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前言沙栏鸡又称三角鸡和石岐鸡。它主产于中山县三角公社,沙栏片一带。解放前常把当地产的鸡直运澳门、香港销售,故此港澳人过去习称它为沙栏鸡。解放后商业部门收购的沙栏鸡均经中山县石岐镇集中,运销港澳所以又称它为石岐鸡。沙栏鸡属于中、小型的优质肉用鸡种,它以肉质嫩滑,味道鲜美、皮脆、可食部分比例大著称,在港澳市场享有盛誉,是我国出口活鸡主要名产鸡之一。沙栏鸡的来源尚无文字记载。据调查,是二百年前从东莞、顺德县移来的居民带来 相似文献
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随着人民生活水平的提高,优质肉鸡市场快速发展.市场从原来的香港、澳门、广东向上海、江苏、浙江、福建等省市扩展,并不断向其它省市蔓延,优质鸡生产已成为畜牧业发展中的一个亮点。 相似文献
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<正> 优质鸡,开始时叫黄羽肉鸡,我国在改革开放开始的上世纪70年代末80年代初就进行了研究和育种工作,至1989年春,更在香港召开了首届大陆、香港、台湾优质肉鸡改良、生产和发展研讨会。尽管人们对优质鸡作了大量的研究工作,但对优质鸡极为重要的肉质评价问题始终未能得到解决。本文不揣浅陋,对优质鸡肉质研究及其评价标准的研究概况综述于后,以供参考。1.优质鸡的实质含义和肉质研究尽管已有多位学者提出了优质鸡的定义(邱祥聘和嘉 相似文献
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广东黄鸡,俗称三黄鸡,本是指羽毛黄色、胫黄色、皮肤黄色的地方鸡种。主要的品种有中山沙栏鸡(石歧鸡)、惠阳胡须鸡、杏花鸡、阳山鸡等。这些品种的鸡,除了具有“三黄”特征外,还有早熟易肥、肉质鲜嫩的特性。适合粤菜烹调鸡只的方法,如白斩鸡、盐银鸡等,因此三黄鸡成了广东优质鸡的代名词。传统的三黄鸡品种,由于没有经过系统的选育,生产性能偏低。据有关资料介绍,母鸡年平均产蛋仅O一用故,抱性严重。商品肉鸡在饲喂全价料的情况下,100-120d出栏,出栏体重:公鸡1.Zkg、母鸡Ikg左右,饲料报酬4-5:1.香港居民大多为广东… 相似文献
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一.关于中国黄鸡 中国是一个讲究美食的民族,要求色、香、味俱全。中国有句古语:无鸡不成宴。这里的鸡系指本地土鸡而言。 中国的本地土鸡品种繁多,列入中国家禽品种的有27种。最具代表性的本地中国黄鸡俗称为石岐杂,严格地讲不是一个标准品种,只是一个商品名称。1950年前后,香港鸡农由广东中山市石岐镇引入石岐鸡,用外来鸡种进行商品杂交,经过多年的自繁自养,形成了香港石岐杂,其血缘关系非常复杂。外貌特征为“三黄”,即:羽毛黄(麻),皮肤黄和胫黄。香港的食家喜食100日龄左右,近性成熟的小母鸡。香港有美食天堂之称… 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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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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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