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绒山羊的疥螨病是由疥螨寄生于绒山羊表皮内或体表所引起的慢性皮肤病，以接触感染，并引起绒山羊发生剧烈的瘙痒和各种类型皮肤类症为特征，可使绒山羊的生长发育受阻，且直接影响绒山羊的生产性能。 相似文献
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陕北白绒山羊是以辽宁绒山羊为父本，陕北黑山羊为母本，经过二十多年改良、培育形成的以产绒为主，绒肉兼用山羊。2003年正式命名为山羊新品种。它是继1985年辽宁绒山羊、1988年内蒙古白绒山羊宣布为地方新品种之后，国家宣布的又一个白绒山羊培育品种。 相似文献
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旨在对辽宁绒山羊和内蒙古绒山羊的基因组选择信号进行筛选。本研究利用Illumina 50K的山羊芯片，对内蒙古绒山羊、辽宁绒山羊和黄淮山羊进行基因型检测，质控后获得50 010个共同SNPs位点。通过群体分化系数Fst和XP-EHH，以黄淮山羊为参考群体分别对内蒙古绒山羊和辽宁绒山羊进行选择信号检测，Fst和XP-EHH值的top 5%作为阈值。结果，利用Fst在绒山羊基因组中筛选到501个候选基因，利用XP-EHH在绒山羊基因组中筛选到145个候选基因。其中有12个SNPs在绒山羊基因组中受到较强选择。通过基因注释筛选到21个候选基因，包括EXOC4、ASIC2、PCDH9、RHBDD1、IRS1和PDE10A等。这些基因主要富集在PI3K-Akt信号通路、蛋白质消化吸收和松弛素信号通路等。研究结果发现，绒山羊在驯化过程中其基因组很多与毛囊相关的基因受到了强烈的选择。这些发现也有助于更好地了解绒山羊的选择进展，为中国绒山羊品种的种质资源保护和利用提供重要参考。 相似文献
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新疆博格达绒山羊是以辽宁绒山羊、野山羊（北山羊）为父本、新疆山羊为母本，利用现代遗传育种繁殖技术，开展多元杂交、近交和斜向横交，历时19年育成的以高产、绒细、绒长、粗放为一体的绒山羊新品种。1998年3月该品种通过自治区畜禽品种审定委员会审定，并由自治区畜牧厅正式命名为新疆博格达绒山羊。 相似文献
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内蒙古绒山羊与辽宁绒山羊皮肤毛囊周期性变化的比较研究 总被引：25，自引：2，他引：25
对内蒙古阿尔巴斯白绒山羊和辽宁绒山羊皮肤及毛囊的组织学周期性变化作了比较研究，结果表明：表皮生发层细胞从3月份开始活动并向下延伸，此时毛囊也开始重建，绒山羊毛囊8-9月份进入兴盛期，12月份进入退行期，2-3月份为休止期。它们进入兴盛期和持续的时间不同，初级毛囊除毛球宽外，其它各性状阿尔巴斯白绒山羊均大于辽宁绒山羊，而次级毛囊各性状辽宁绒山羊都大于阿尔巴斯白绒山羊，在大多数月份二者差异显著。毛囊深、密度、S／P、毛球宽和生长期是影响产绒量的因素。 相似文献
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多年来，在农业部大力支持下，辽宁省立足辽宁绒山羊品种资源优势，坚持走以品种选育促生产开发，以生产开发促品种保护的发展之路，精心培育辽东部绒山羊优势产业区，初步建成了面向全国的辽宁绒山羊良种繁育基地。长期以来辽宁绒山羊这一品种被国内各大绒山羊产区引进，为各地培育新品种和开展杂交改良、促进农牧民增收致富作出了卓越贡献。 相似文献
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在农区开展绒山羊养殖，在遵守绒山羊一般养殖规律的前提下，还要考虑到农区养殖绒山羊的特殊性，其中包括饲草饲料来源、放牧特点、羊只运动、寄生虫感染、防疫、养殖规模的确定等因素。笔者根据农区的气候、资源、经济条件、绒山羊生理要求等方面，对农区养殖绒山羊的主要技术要点简要进行总结，为促进农区绒山羊养殖活动提供参考。 相似文献
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岫岩县是辽宁绒山羊基地县之一，是辽宁绒山羊数量最多的县，是辽宁省联合育种八市（县）之一，年饲养量为55万只，现存栏43万余只。岫岩辽宁绒山羊具有体大、绒长、绒细、产绒量高、易饲养、抗病力强等特点，岫岩以得天独厚的地理位置和自然条件为辽宁绒山羊的大力发展创造了广阔的空间。 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