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工厂化高效养羊是现代化养羊业发展的必由之路，只有在养羊生产中广泛采用高效繁殖管理和发情调控等先进技术，才能使养羊业发展成为工厂化生产的高效产业。同期发情和双羔技术在现代化养羊生产及生物新技术应用中都具有重要作用，也是提高绵羊繁殖力的关键技术。本文介绍了该项技术在朝阳市种畜场等5个不同地区的实际应用效果的对比试验。 相似文献
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(续 1 ,上接 2 0 0 0年第 7期 )2 工厂化高效养羊的高频高产繁殖配套技术工厂化高效养羊是现代畜牧业的重要特征 ,也是畜牧业发展的必由之路 ,只有在养羊生产中广泛采用高效繁殖管理和母羊发情周期调控等先进技术 ,才能使养羊业发展成为工厂化生产的高效产业。绵羊高效繁殖的生物工程技术 ,是保证工厂化养羊母羊高效繁殖最有力的手段 ,也是实现工厂化高效养羊的核心技术。目前 ,已在生产中应用 ,并已发挥了重要作用的技术主要包括 :母羊发情调控 ,母羊一年两产 ,生殖免疫及免疫多胎 ,公羊生殖保健 ,优化人工授精 ,营养繁殖调控 ,母羊发情鉴… 相似文献
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不同处理方法对山羊同期发情效果研究 总被引：5，自引：0，他引：5
工厂化高效养羊是我国养羊业发展的必然趋势。工厂化生产的特点 :一是不同车间 (栋舍 )饲养不同生理阶段的畜禽 ;二是各车间在生产上紧密衔接、相互制约 ;三是调群转舍或出栏时要执行全进全出流水作业。而传统养羊 ,对羊的繁殖无计划 ,一年中断断续续产羔 ,很不集中 ,俗称“拉拉羔” ,给工厂化生产和管理带来很大不变 ,不能进行规模化、批量化生产 ,己成为养羊业实现工厂化生产所不可逾越的障碍。采用羊同期发情技术 ,则可使羊群在某一时间集中发情 ,从而实现集中配种、产羔、育肥 ,使在不同圈舍饲养不同生理阶段的羊成为现实。由此可见 ,同… 相似文献
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加入WTO和国家西部大开发战略为西部养羊业创造了大发展的机遇,但同时也面临着严峻的挑战.如何在新的历史条件下加快步伐,发挥西部的优势发展养羊业?本文从西部牧区在国养羊生产中的地位及作用、西部大开发给西部养羊业带来新的机遇、西部地区调整养羊生产方向的论证及发展途径以及西部地区调整以内羊为主养羊生产方向,加快工厂化高效养羊步伐的必要性与途径、工艺流程及技术要点五个部分,重点阐述了在西部地区加快发展肉羊产业的重要性,并较详细介绍了工厂化养羊的技术体系与技术要点,提出了工厂化高效养羊的技术思想. 相似文献
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《畜牧兽医科技信息》2016,(4)
正同期发情技术是规模高效养羊生产的关键技术,具有很强的实用性。在生产实践中,人为控制母羊的发情时间,达到集中发情、集中配种、集中产羔、集中出栏,可提高母羊的繁殖率和养羊组织生产管理水平,实现养羊业高效益。但是,母羊同期发情前的准备工作不容忽视,它将直接影响该项技术 相似文献
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(上接2000年第8期41页) 2 工厂化高效养羊的高频高效繁殖配套技术 2.3 一年两产或两年三产高频繁殖生产体系 高频繁殖,是随着工厂化高效养羊,特别是肉羊及肥羔羊生产而迅速发展的高效生产体系.这种生产体系的指导思想是:采用繁殖生物工程技术,打破母羊的季节性繁殖的限制,一 年四季发情配种,全年均衡生产羔羊充分利用饲草资源,使每只母羊每年所提高的胴体重量达到最高值.高效生产体系的 特点是:最多限度地发挥母羊的繁殖生产潜力,依市场需求一年均衡供应肥羔上市,资金周围期缩短,最大限度提高养羊设 施的利用率,提高劳动生产率,降低成本,便于工厂化管理. 相似文献
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养羊业是新疆畜牧业的支柱产业，近年来工厂化高效养羊正在蓬勃发展。生物诱导、同期发情、集中人工授精等新技术得到充分的应用和推广，为广大农牧民带来了实惠。笔者从1998年开始从事该项技术的推广应用工作。现将在实际推广工作中的几点体会报告如下。 相似文献
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绵羊同期发情技术是提高绵羊繁殖率和养羊生产管理水平的一项有效技术措施,已广泛应用于养羊业生产.在生产实践中,采用同期发情技术,可以使母羊在一定时间内集中发情、集中配种、集中产羔,便于管理和组织,具有很强的实用性.主要对绵羊同期发情技术的机理、同期发情技术中所使用的主要药物和影响因素等进行概述. 相似文献
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随着我国经济体制改革的深入,畜牧业生产结构的调整,现代养羊企业如雨后春笋般不断涌现,带动了区域性养羊业乃至全国养羊业的迅速发展。羊繁殖率的高低代表了羊的生产力高低,直接影响到养羊的经济效益,提高羊繁殖率是工厂化高效养羊生产体系中的关键环节,羊群的繁殖特性和羔羊成活率为高效肉羊生产奠定了基础。现代化的肉羊业要求肉羊具有早熟、多胎多产、生长发育快、肉质好等优良特性。因此,在肉羊生产中,提高繁殖力、培育多胎多产的肉羊品种备受重视。国内外科研人员及生产工作者通过育种、激素、营养等方面的研究,在提高肉羊繁殖力方面… 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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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