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添加咖啡因对犬冷冻精液成活率的影响 总被引：2，自引：0，他引：2
在犬精液解冻液中添加咖啡因后,对冷冻精液进行解冻,添加浓度为0.5%的咖啡因,对增强精予活力的效果最佳,精子存活时间最长,提高了母犬受孕率. 相似文献
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实验旨在探讨在猪精液于4℃平衡2 h过程中0.2 g/L咖啡因与精液共孵育2 h、1 h和0.5 h,对颗粒冻精解冻后精子活率、活力、质膜完整性和顶体完整性以及解冻后精子体外存活时间等指标的影响,以期进一步提高猪颗粒冻精质量。实验结果表明,在精液冷冻之前,咖啡因不同平衡时间组的精子活率和活力都呈现出升高趋势,但与对照组差异不显著;咖啡因与精液共孵育2 h、1 h和0.5 h组的精子顶体完整率和质膜完整率显著低于对照组,前3组之间差异均不显著。而颗粒冻精解冻后,咖啡因与精液共孵育2 h、1 h和0.5 h组精子活率和活力均显著高于对照组,其中共孵育1 h组显著高于其他3组(P0.05),共孵育2 h组和0.5 h组间差异不显著(P0.05);共孵育2 h组精子顶体完整率和质膜完整率显著低于对照组和共孵育0.5 h、1 h组(P0.05),但后3组之间差异不显著;共孵育2 h组精子存活时间显著低于对照组、共孵育1 h和0.5 h组(P0.05),其中共孵育1 h组精子存活时间最长,达7 d以上。总之,在精液4℃降温平衡过程中咖啡因与精液共孵育1 h对冷冻后精子质量最有利,解冻后精子活率和活力显著高于其他各组,且解冻后精子体外存活时间最长。 相似文献
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通过研究波尔山羊冷冻精液稀释液和稀释倍数,以筛选最佳稀释液配方、确定适宜的稀释倍数、提高波尔山羊精液冷冻效果。结果表明,4号稀释液解冻后精子活率高于1号、2号、3号稀释液解冻后精子的活率,差异极显著( P<0 .0 1 ) ;4号稀释液解冻后精子存活时间为61 .2 6h,长于1号、2号稀释液精子存活时间( P<0 .0 1 ) ,短于3号稀释液精子存活时间,但差异不显著( P>0 .0 5 ) ,说明4号稀释液冷冻效果最好。精液稀释3倍、4倍、5倍解冻后精子活率分别为0 .5 0 2、0 .5 0 1、0 .495 ( P>0 .0 5 ) ,均高于稀释6倍、7倍、8倍的精子活率( P<0 .0 1 ) ,表明波尔山羊冷冻精液稀释倍数以3～5倍为宜。 相似文献
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《浙江畜牧兽医》2020,(1)
本试验用0.5 mL细管作为冷冻载体对金华猪精液进行冷冻保存研究,比较3种冷冻稀释液及不同冷冻方法、解冻程序对金华猪精液冷冻的效果,以解冻后的精子活力、畸形率和质膜完整率为判定指标。结果表明:Ⅱ、Ⅲ号冷冻稀释液处理组解冻后精子的活力、畸形率和质膜完整性都明显地高于Ⅰ号冷冻稀释液(P0.05);Ⅱ号冷冻稀释液和Ⅲ号冷冻稀释液处理组之间没有明显差异(P0.05)。采用程序冷冻仪冷冻法,使用Ⅲ号冷冻稀释液冷冻保存精子,并在60℃,8 s条件下水浴解冻精子后,精子活力和质膜完整率最高分别为42.3%和50.3%,畸形率最低为17.7%。因此,采用程序冷冻仪冷冻法,使用Ⅲ号冷冻稀释液,在60℃,8 s条件下水浴解冻方法较为适合0.5 mL细管金华猪精液冷冻保存及解冻。 相似文献
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猪冷冻精液的研究 总被引：1，自引：0，他引：1
本试验以甘油、乙二醇为抗冻剂，并添加ATP或安息香酸咖啡因，以解冻后精子活力、顶体完整率、顶体膨胀率、顶体破损率、尾部畸形率和在37℃下的存活时间几个重要评定指标为依据，筛选了几种猪颗粒冻精的冷冻稀释液配方，并优化了其冷冻程序。结果表明，与对照组相比，在冷冻液中添加0．1mg／ml的ATP或2mg／ml的安息香酸咖啡因都能显著提高解冻后精子活力(分别提高0．13和0．18)，降低顶体膨胀率(两者都将近降低了11％)，并能延长其存活时间(分别延长10．5h和11．8h)；甘油和乙二醇两种抗冻剂配合使用，将显著提高冻后精子的活力与存活时间，其较优混合量为甘油3％，乙二醇0．5％。 相似文献
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鸵鸟精液品质及精液低温保存条件的研究 总被引：1，自引：0，他引：1
测定鸵鸟精液生理指标 ,结果表明 ,鸵鸟的射精量为 0 1 7～ 2 0 3mL ,精液 pH6 7～7 3,精子密度为 1 5 7～ 48 0亿 /mL ,原精液精子畸形率 3 0 9%～ 1 3 3% ,精子活率范围0 78～ 0 92。对鸵鸟精液用不同稀释液稀释后低温保存效果比较研究 ,初步获得在 0～ 5℃时用改进MEM液作稀释液以 1∶2比例稀释后 ,精子在设计的条件下存活时间平均约 72h ,而相应原精液或 0 85 %NaCl液作 1∶2稀释的精液在同样条件下精子仅能存活约 2 4h 相似文献
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牛精液的质量与母牛受精率关系 总被引：2，自引：0，他引：2
牛冷冻精液的主要质量特性包括解冻后活力、每剂量中直线前进运动的精子数、精子顶体完整率、精子畸形率、解冻后的存活时间、精液中的污染及细菌数。这些质量特性对于母牛受精率有着直接的作用和影响。 相似文献
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利用甘油和二甲基亚砜（DMSO）作为冷冻保护剂,以精子存活率为评价指标,研究了冷冻保护剂对香猪精液冷冻保存效果的影响。试验分工、Ⅱ、Ⅲ、Ⅳ4个试验组和1个对照组。以解冻后的精子活力、活率为判断标准,比较了4种冷冻保护液对香猪精液冷冻保存的影响。结果表明,试验Ⅰ、Ⅱ、Ⅳ组精子活率显著高于Ⅲ组（含5％甘油）（P〈0．05）;试验Ⅰ、Ⅱ、Ⅳ组之间差异不显著（P〉0．05）;Ⅰ组精子活率最高,达到53．10％。 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