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藏羚羊与其他羊种被毛纤维氨基酸含量的比较分析研究 总被引：1，自引：0，他引：1
本研究对藏羚羊被毛纤维氨基酸含量进行了测定。结果表明:藏羚羊粗毛中谷氨酸含量比绒纤维的高出约3个百分点,但组氨酸和胱氨酸含量仅为绒纤维的15.48%和66%。藏羚羊被毛角蛋白氨基酸的组成与山羊、绵羊被毛纤维相同;但在各种氨基酸的含量比例上有一定的差异:藏羚羊绒组氨酸含量为5.88%,比山羊绒和绵羊毛高约4个百分点;胱氨酸含量为10.60%,高于其他所测山羊的绒和毛;碱性氨基酸与酸性氨基酸含量接近(14.87%,15.23%);藏羚羊绒促螺旋蛋白(Paa)含量低于降螺旋蛋白(Daa)。 相似文献
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作者对藏羚羊被毛纤维氨基酸含量进行了测定,结果表明,藏羚羊粗毛中谷氨酸含量比绒纤维的提高32.5%,但组氨酸和胱氨酸含量仅为绒纤维的66%和15.48%。藏羚羊被毛角蛋白氨基酸的组成与山羊、绵羊被毛纤维相同;但在各种氨基酸的含量比例上有一定的差异,藏羚羊绒组氨酸含量为5.88%,均高于山羊绒和绵羊毛中组氨酸的含量;胱氨酸含量为10.60%,高于其它所测山羊的绒和毛;碱性氨基酸与酸性氨基酸含量接近（14.87%,15.23%）;藏羚羊绒促螺旋蛋白（Paa）含量低于降螺旋蛋白（Daa）。 相似文献
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对甘肃现代肉羊新品种选育群毛纤维氨基酸的种类和含量进行了测定分析。结果表明:甘肃现代肉羊新品种选育群的毛纤维均由18种氨基酸组成,其中谷氨酸含量最高(12.79%～15.04%),其次是胱氨酸(8.46%～10.74%),含量最少的是蛋氨酸(0.29%～0.47%)。含硫氨基酸含量最高的是F3母羊,为11.21%,而且F3胱氨酸含量最高为10.74%。毛纤维中酸性氨基酸、碱性氨基酸、中性氨基酸及含硫氨基酸含量的顺序为中性氨基酸>酸性氨基酸>碱性氨基酸>含硫氨基酸。 相似文献
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优质蛋白玉米和普通玉米氨基酸消化率的比较研究 总被引：1，自引：0，他引：1
400日龄海兰褐父母代种公鸡16只,采用无氮日粮法测定了优质蛋白玉米和普通玉米的氨基酸表观消化率和真消化率,结果表明:优质蛋白玉米中的总赖氨酸(+25%)、组氨酸(+29%)、色氨酸(+15%)、精氨酸(+16%)、天门冬氨酸(+20%)、脯氨酸(+19%)含量高于普通玉米;亮氨酸(-20%)、苯丙氨酸(-22%)含量低于普通玉米;其他氨基酸含量比较相近;另外,亮氨酸∶异亮氨酸低于普通玉米,分别为2.97∶1和3.42∶1。优质蛋白玉米中除了胱氨酸的表观消化率(P<0.05)、真消化率(P<0.05)高于普通玉米外,其他各种氨基酸的表观消化率、真消化率以及总氨基酸的表观消化率、真消化率与普通玉米相近(P>0.05)。由此可知,优质蛋白玉米的氨基酸组成有所改善,而氨基酸消化率没有降低。 相似文献
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天祝白牦牛被毛有髓毛、两型毛、无髓毛均因部位不同其含量、细度和长度有较大的差异。纤维类型分析发现 ,天祝白牦牛被毛的绒毛中 ,存在外形 (长度和细度 )特征明显不同的两种无髓毛纤维 (绒毛 ) ,并将其分为无髓粗绒和无髓细绒。无髓粗绒的细度为 46 43 μm± 7 89μm ,无髓细绒的细度为 2 2 76μm± 3 91μm ,二者之间平均直径相差 2 3 67μm ,各部位无髓粗绒与无髓细绒在细度上有极显著的差异 (P <0 0 1)。无髓粗绒和无髓细绒的平均伸直长度分别为 8 92cm±3 97cm和 5 2 1cm± 1 17cm ,各部位也存在显著差异。因此 ,首次提出将天祝白牦牛的被毛中的无髓毛 (绒毛 )纤维分为无髓粗绒毛和无髓细绒毛两种纤维类型。 相似文献
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本试验旨在通过测定生长及被毛发育相关指标,确定蛋氨酸及半胱氨酸在獭兔饲粮中的最优添加水平,并了解它们在影响獭兔生长及被毛发育方面的相互关系。选择同天出生的仔獭兔294只,以窝为单位随机分为7组,每组7个重复,每个重复6只。对照组獭兔饲喂基础饲粮(含半胱氨酸0.23%、蛋氨酸0.24%),试验组獭兔分别饲喂在基础饲粮中添加0.10%、0.25%和0.40%半胱氨酸或蛋氨酸的试验饲粮。饲养周期为初生到151日龄。结果表明:饲粮中添加含硫氨基酸提高了獭兔的150日龄体重及平均日增重,0.25%、0.40%组与对照组相比存在显著差异(P<0.05)。随着含硫氨基酸添加水平的增加,獭兔的料重比表现为下降的趋势(P>0.05),平均日采食量则表现为上升的趋势(P>0.05)。与对照组相比,0.25%和0.40%组换毛完成率和被毛密度显著或极显著提高(P<0.05或P<0.01),但0.25%与0.40%组间差异不显著(P>0.05)。从92日龄和151日龄被毛评分来看,獭兔被毛品质随含硫氨基酸添加水平的增加仅表现出提高的趋势,组间差异不显著(P>0.05)。上述各指标在蛋氨酸与半胱氨酸各对应水平间均无显著差异(P>0.05)。通过生长曲线拟合分析,在2种含硫氨基酸的添加水平内,添加水平仅改变獭兔的最大生长速度,而对成年体重的影响不大。由此得出,蛋氨酸与半胱氨酸对獭兔生长与被毛发育均具有促进作用,均以0.25%添加水平为最优,且促进效果几乎同等,等量半胱氨酸可以完全代替蛋氨酸。但是,仅通过添加含硫氨基酸不能显著地改变獭兔的表观被毛品质。 相似文献
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内蒙古白绒山羊小肠可吸收氨基酸目标模式和消化率的研究 总被引：3，自引：0，他引：3
本文为内蒙古白绒山羊氨基酸利用和蛋白质周转规律研究项目的基础部分,主要是为进一步研究小肠可吸收氨基酸模式对绒山羊小肠氨基酸的消化、组织吸收和利用及确立绒山羊小肠理想氨基酸模式提供基础数据。试验1对体重25～30kg的2周岁内蒙古白绒山羊半同胞羯羊的肌肉、绒毛纤维和微生物蛋白的氨基酸组成进行了分析和评价。研究发现山羊绒和山羊毛纤维中各种氨基酸的组成和肌肉组织明显不同。绒毛纤维的生长需要更多的含硫氨基酸,而肌肉生长需要较多的赖氨酸和组氨酸。山羊绒和粗毛在氨基酸的需要上也存在着一定的差异。瘤胃微生物蛋白的氨基酸组成不平衡。为此根据绒山羊的生产特点,按不同比例对肌肉与羊绒的氨基酸模式进行加权,获得4种小肠可吸收氨基酸目标模式,分别为M(肌肉、M90+C绒毛10、M80+C20和M70+C30,以期在肌肉和绒毛两种模式之间寻求出一种保持绒毛纤维生产和肌肉生长平衡的相对理想的氨基酸模式。试验2选用12只体况良好、体重25～30kg,的2周岁内蒙古白绒山羊半同胞羯羊,安装永久性瘤胃瘘管、十二指肠近端瘘管和回肠末端瘘管进行试验。测定了基础日粮条件下绒山羊消化道不同部位氨基酸流通量与消化率。结果表明,在基础日粮条件下,氨基酸的平均消化率为76%左右,含硫氨基酸Met十Cys的十二指肠流 相似文献
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本文研究对中华绒山羊发展研究中心恩格贝基地引入的辽宁白绒山羊及其纯繁后代中长粗毛型、短粗毛型和多绒型三种类型成年白绒山羊的外形特征的毛被特性进行了比较研究。测定了抓绒量、净毛绒率、密度和绒毛比。研究结果显示：三类型山羊在毛被外观、抓绒量、绒毛密度和绒毛比方面均存在明显差异。其中，ＭＤ山羊外观粗毛稀短而绒毛长密；ＳＨ型山羊粗毛虽短但较粗密；ＬＨ型则粗毛长密而绒毛短，ＭＤ型山羊产绒量、绒密度及绒毛比均 相似文献
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通过对青海天峻县高原型藏羊毛纤维物理性能分析。结果表明纤维类型重量百分比:无髓毛、有髓毛和干死毛含量:周岁羊平均分别占48.87%,43.23%,15.38%,无干死毛羊只占15.11%;成年羊平均分别占40.85%,44.40%,17.52%,无干死毛羊只占14.41%。羊毛纤维细度:无髓毛、有髓毛和干死毛细度,周岁羊平均分别为21.06μm,38.85μm,68.31μm,成年羊平均分别为22.44μm,38.67μm,79.29μm。毛辫长、底绒长、毛纤维手排平均长度:周岁羊平均分别为274.13mm,82.72mm,70.05mm;成年羊平均分别为275.30mm,90.70mm,73.21mm。净毛率和色度(Wht、YT):周岁羊平均分别为72.37%,68.68,30.60;成年羊平均分别为73.55%,69.11,30.16。天峻县高原型藏羊具有良好的毛辫长度和底绒长度,而且底绒细度细,粗毛、绒毛比例适中,干死毛含量少,净毛率高,色度好的特点,是纺织地毯、长毛绒和提花毯的优质原料。 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