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本试验以Tris－葡萄糖稀释液为基础稀释液，就冷冻起始温度和解冻温度对犬精子冻后活率的影响进行了研究。试验结果表明：始冻温度为－70℃时冻后精子活率最高，达0．6284±0．0408，明显优于始冻温度为－65℃和－75℃时的冻后精子活率（P〈0．05）；解冻温度为70℃时冻后精子活率最好，达0．6810±0．0324，明显优于60℃和65℃时的冻后精子活率（P〈0．05）。 相似文献
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从稀释液、解冻液、解冻速率方面研究了猪精液冷冻保存的效果。结果表明：在八种稀释液中,用Ⅰ号稀释液制作的冷冻精液解冻后精子活率（33±1．2）％优于其它组（P〈0．05）;Ⅴ号解冻液解冻后精子活率（34±2．4）％极显著高于Ⅰ、Ⅲ、Ⅳ号解冻液（P〈0．01）,Ⅴ号解冻液解冻后精子存活时间506．6±40．4h,极显著高于Ⅰ、Ⅱ、Ⅲ号解冻液（P〈0．01）;以27．5℃／s的速率解冻,解冻后精子各项指标均为最高值。 相似文献
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不同冷冻温度对野血牦牛精子的冻后活力有一定的影响,笔者对12头不同龄野血牦牛的精液采用不同温度冷冻后进行了活力比较。得出：野血牦牛精液的最佳冷冻温度为-90±5 - -135±5℃,在此温度区域内随着年龄的增加所需冷冻温度有降低趋势。 相似文献
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为优化简易装置制备鸡精液甘油细管冻精的条件,采用11%的甘油浓度、不同的熏蒸方式和熏蒸时长等条件制作细管冻精,通过测定精子活力及人工输精后的孵化效果筛选冷冻、解冻条件。结果表明:先以-15^-6℃/min的速率熏蒸1~5min后,再以-60^-25℃/min的速率熏蒸1~5min(两步均1min除外)冷冻效果最好,解冻后活力达0.8以上;以5℃的温度解冻30~60s和10℃的温度解冻15~60s的解冻效果最佳;用优化的冷冻程序、6%浓度甘油制作细管冻精,最高平均获得了77.63%的受精率和73.38%的出苗率。研究结果为鸡精液简易装置冷冻保存技术的系统化和标准化研究提供了技术支撑。 相似文献
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用液氮熏蒸法在氟板上制作冻精颗粒,以解冻后的精子活率、活力和质膜完整性为判定指标,比较4种冷冻稀释液及不同冷冻-解冻程序对五指山小型猪精液冷冻的效果。结果表明:①Ⅳ号冷冻稀释液冷冻解冻后精子的活率(0.610±0.036)、活力(0.427±0.025)和质膜完整性(0.503±0.015)均显著高于Ⅰ、Ⅱ和Ⅲ号冷冻稀释液(P<0.05)。②实验中精液在4℃冰箱中平衡降温2 h的精液精子活力、质膜完整性均好于在17℃平衡3 h再放入4℃冰箱中平衡2 h的解冻效果,而且精子活率差异显著(P<0.05)。③湿解法的效果优于干解法。 相似文献
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《湖南畜牧兽医》2017,(3)
鸡精液DMA颗粒冷冻技术方法简单,但还很不稳定。试验采用3种颗粒冻精制作以及2种冻精解冻技术对黑丝羽乌骨鸡精液冷冻技术进行了研究。结果表明:1)非浮体方式当温度设定为-40至-170℃的较宽范围时,温度对活力影响较大,滴冻起始温度与持续熏蒸时间二者交互作用下,对活力影响差异显著(P0.05);浮体方式当温度范围为-100℃至-130℃,时间对活力影响较大,滴冻起始温度与持续熏蒸时间二者交互作用下,对活力影响差异不显著(P0.05)。2)采用颗粒直接滴冻技术,稀释后平衡10min与平衡20min组冻精解冻后活力没有显著差异;解冻温度为40℃和50℃较好,两组之间活力无显著差异;采用恒温板解冻,每次解冻1颗的活力显著高于每次解冻3颗的活力。因此,黑丝羽乌骨鸡精液,采用DMA为冷冻保护剂,稀释后平衡10min,添加冷冻保护剂后直接滴冻,50℃恒温板解冻能获得较好的冷冻效果。 相似文献
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猪精液冷冻技术的研究 总被引：31，自引：0，他引：31
以解冻后的精子活率、活力、质膜完整率、顶体完整率和人工授精结果为判定指标 ,比较了几种冷冻稀释液、解冻液及冷冻 -解冻程序对猪精液冷冻的效果 ,并对所筛选出的最佳稀释液和冷冻程序做了改进。结果如下 :(1) 号稀释液冷冻解冻后的精子活力 (32 .4± 7.3) %、活率 (4 2 .2± 3.2 ) %、顶体完整率 (6 2 .3± 0 .8) %和弯尾率 (4 2 .6± 7.5 ) %均显著高于 、 、 号稀释液 (P<0 .0 5 )。 (2 )在 号稀释液中添加 0 .5 %、1%和 2 %的 O.E.P(氨基 -钠 -十二烷硫酸酯 )使精子活率提高 5 %、弯尾率提高 6 %、顶体完整率提高近 10 % ,与对照组相比差异显著 (P<0 .0 5 )。 (3)应用改进的稀释液 ( 液加 1% O.E.P) ,细管法比颗粒法冷冻精子活率提高近 7个百分点 ,活力提高 6个百分点 (P<0 .0 5 )。(4 )室温预平衡 4h的精子活力和活率都比对照组 (0 h)有显著提高 (P<0 .0 5 ) ,而预平衡 2、6 h的精子活力和活率与对照组差异不显著 (P>0 .0 5 )。 (5 ) 号解冻液解冻后精子活力 (4 2 .9± 2 .6 ) %显著高于 、 、 号解冻液 (P<0 .0 5 )。 (6 )用 5 0℃水浴解冻精子的活力 (4 6 .3± 2 .6 ) %显著高于 39℃ (4 2 .9± 2 .6 ) %和 70℃水浴 (4 1.1± 5 .7) %解冻的精子活力 (P<0 .0 5 )。 (7)精清和 号解冻液 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