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本研究探讨卵巢保存温度、激素及体外培养时间对延边黄牛卵母细胞体外成熟的影响.研究结果表明,将卵巢分别保存在25～29℃、30～35℃、36～40℃的生理盐水中运输时,卵母细胞体外成熟率分别为55.3%、70.1%、60.7%,各组间无显著性差异(P＞0.05);当将卵母细胞分别培养在无激素的对照组(TCM199 10?S)、添加雌二醇(estradiol)-17β组、LH 雌二醇-17β组时,卵子的成熟率分别为57.8%、64.3%、70.1%,对照组与LH 雌二醇-17β组差异显著(P＜0.05);卵母细胞各自培养22～25 h、26～30 h、31～34 h时,卵子体外成熟率分别为56.3%、65.4%、68.4%,3组间无显著差异(P＞0.05). 相似文献
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白牦牛卵母细胞的采集方法及卵巢贮存条件对其体外成熟的影响 总被引：1，自引：0，他引：1
探讨了白牦牛卵母细胞的采集方法以及卵巢保存温度和时间对其体外成熟的影响。结果表明:先抽吸卵泡,每卵巢平均可获可用卵母细胞4.7枚,再切割卵巢,可显著提高可用卵母细胞数9.8枚/卵巢。将屠宰白牦牛卵巢分别置于20~29℃和30~38℃的生理盐水中,6 h内收集卵母细胞,其成熟率、卵裂率分别为65.7%、41.3%和73.3%、45.7%,两者之间的差异均不显著,但均与<20℃组(16.0%、0)差异显著。在30~38℃下,白牦牛卵巢保存时间超过6 h,卵母细胞的成熟率和卵裂率显著下降,卵巢保存时间在2 h以内最好,最晚不超过6 h。 相似文献
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<正>卵母细胞的体外成熟(in vitro maturation,IVM)是指在体外人工设定的条件下,卵母细胞经过一系列的生长发育最终形成具有受精能力的成熟卵母细胞的过程。哺乳动物卵母细胞的体外成熟培养是胚胎体外生产的基础环节。1卵巢获取通常卵巢从屠宰场获取,用含双抗的磷酸盐缓冲液(PBS)或生理盐水在尽可能短的时间内运回实验室。卵巢的保存温度及贮存时间影响卵母细胞的体外成熟。E.M.Walters等[1]研究了不同保存温度及不同贮存时间对猪卵母细胞体外成熟的影响,结果发 相似文献
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本研究旨在探讨不同温度和时间保存猪卵巢后对猪卵母细胞体外成熟的影响,通过培养液中添加不同浓度褪黑素,探索褪黑素对卵母细胞体成熟的最佳浓度,为远距离运输卵巢最适温度和时间条件的研究提供理论依据,进而改善胚胎体外生产效率。本实验将卵巢分别在4、17、25、37℃保温杯内保存0、4、8、10 h,筛出最适温度与时间后,在卵母细胞体外培养液中分别添加10-5、10-7、10-9 mol/L浓度褪黑素,体外成熟44 h,采用孤雌激活的方式发育为胚胎,统计极体排出率、卵裂率、囊胚率。结果显示：卵巢37℃保存10 h,4℃保存4 h后卵母细胞均未达到MII期;与37℃和4℃相比,17℃、25℃保存卵巢后卵母细胞成熟质量得到大幅度提升(P<0.01);卵巢在25℃随着保存时间的延长,卵母细胞成熟率无显著差异,囊胚率高于17℃(P<0.01),且25℃保存卵巢8 h与4 h囊胚率无显著差异;25℃保存8 h后培养液中添加褪黑素,发现卵母细胞发育能力不受损伤,添加10-7 mol/L褪黑素对卵母细胞体外发育... 相似文献
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本试验利用抽吸法和剖切法两种采集方法采集猪卵巢卵母细胞,对获得可用卵丘卵母细胞数和卵丘完整程度的影响进行比较研究,并分析在卵巢收集时不同的保存温度、运输时间对卵母细胞体外成熟的影响。结果表明：剖切法采集细胞数目显著高于抽吸法（P〈0．01）;A、B级卵母细胞的比例在剖切法中显著高于抽吸法（P〈0．05）;抽吸法所采集的c级卵母细胞显著高于剖切法（P〈0．05）;剖切法中卵母细胞卵丘完整率高于抽吸法（P〈O．05）;离体卵巢保存的最佳温度为36℃-38℃;其保存时间为1～1．5h时成熟率57．6％与2—2．5h时成熟率52．8％相比无显著差异（P〉O．05）;保存时间超过6h时卵母细胞的成熟率显著下降。 相似文献
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低温长时间保存的绵羊卵巢对卵母细胞发育潜力的影响 总被引：1，自引：0，他引：1
本试验比较了绵羊卵巢不同的保存温度、时间与保存液对其卵母细胞孤雌发育能力的影响。结果表明,将绵羊卵巢在14~18℃保存15~17h,对卵母细胞的成熟率(80.9%vs82.2%)、孤雌激活后囊胚的发育率(21.0%vs22.0%)均无显著影响,采用生理盐水或D-PBS保存对卵母细胞的发育亦无显著差异;而将卵巢保存在4℃或25~30℃却显著降低了卵母细胞的成熟率(61.9%vs19%)与卵裂率(8.6%vs9.1%),没有发育到囊胚。从而得出,卵巢在14~18℃保存过夜,不影响卵母细胞的发育能力。 相似文献
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《黑龙江畜牧兽医》2017,(11)
为了探索多浪羊卵母细胞体外成熟的影响因素,提高体外受精率,为多浪羊繁殖潜能的发挥提供基础,试验以屠宰场多浪羊卵巢为材料,采用不同运输条件及不同卵母细胞收集方法,研究运输条件及采集方式对卵母细胞体外成熟的影响。结果表明:温度为25~30℃时卵母细胞成熟率(49.4%)与20~25℃(52.9%)相比差异不显著(P0.05),与30~38℃(23.2%)及4~10℃(35.7%)相比差异显著(P0.05)。保存时间1~2 h的成熟率(49.1%)与保存时间2~3 h的成熟率(50.3%)相比差异不显著(P0.05),保存时间6~8 h的成熟率(26.0%)显著低于保存时间1~2 h和2~3 h的成熟率(P0.05)。切割法收集的卵母细胞数及体外成熟率均显著高于抽吸法(P0.05)。卵巢在20~30℃条件下、1~3 h内运回畜牧科技重点实验室卵母细胞体外成熟率最高,而且切割法优于抽吸法。 相似文献
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为研究卵巢质量和保存液对牛卵母细胞孤雌发育能力的影响,本实验将采集卵巢按其质量分为A、B 2组,于生理盐水中运输到实验室,利用切割法采集卵巢表面卵泡中的卵母细胞培养,成熟后孤雌激活;将采集牛卵巢随机分到D-PBS保存液与生理盐水中,运送到实验室后采集卵母细胞培养。以卵母细胞的成熟率、孤雌胚的卵裂率、囊胚率来评价卵巢质量、保存液对卵母细胞发育能力的影响。结果表明:A组卵巢平均获得的卵母细胞数(2.1枚)显著低于B组卵巢获得的卵母细胞数(5.5枚),从A组卵巢上获得的卵母细胞成熟率(56.98%)、卵裂率(42.86%)及囊胚率(9.52%)显著低于B组卵巢上获得的卵母细胞成熟率(84.38%)、卵裂率(70.17%)及囊胚率(31.50%)(P<0.05);使用含离子丰富的D-PBS溶液,较对照组保存液生理盐水,其卵母细胞的成熟率、卵裂率及囊胚率均没有显著差异(P>0.05) 相似文献
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利用体外受精技术产业化生产奶牛胚胎--长距离运送卵巢的保存温度的影响 总被引：8，自引：0，他引：8
实验 1,利用 9187枚荷斯坦母牛卵巢 ,进行 71批次的胚胎体外产业化生产 ,结果表明 ,母牛卵巢在离体后约 14 h的长时间运输保存条件下 ,控制其保存温度从最初的 30～ 35℃缓慢下降至到达实验室时的 15～ 2 0℃时胚胎体外生产效果最好 ,其卵母细胞体外受精卵裂率 (75 .6 % )、囊胚率 (2 5 .0 % )和冻胚率 (10 .0 % )均显著地高于其他各组 (10～14℃ ,2 1～ 2 8℃ ,P<0 .0 1)。实验 2 ,在相同的保存温度下 ,保存 7h的肉牛卵巢产胚效果要显著地好于保存 14 h的奶牛卵巢组。结果说明 ,在当前牛胚胎产业化生产的条件下 ,牛卵巢在收集和运输期间的保存温度变化对其后卵母细胞体外受精及胚胎体外发育有很大的影响 ;母牛卵巢在适当的温度下保存 14 h后 ,仍可获得较好的体外产胚效果 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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乳酸杆菌作为益生菌广泛用于人和动物.本文综述了乳酸杆菌改善宿主健康的机制.乳酸杆菌可通过产生抗菌物质如乳酸、过氧化氢、细菌素,或者通过竞争营养或肠道黏附位点来抑制致病菌;通过诱导黏附素的分泌或阻止细胞凋亡而增强肠道的屏障功能,从而保护肠道.文章重点讨论了乳酸杆菌表面成分(表面蛋白、脂磷壁酸和肽聚糖)与肠道受体(C型凝集素受体、Toll样受体和Nod样受体),阐述了他们结合后启动免疫调节信号,调控肠道免疫功能以发挥改善健康作用的机制. 相似文献
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Billinghurst RC Brama PA van Weeren PR Knowlton MS McIlwraith CW 《American journal of veterinary research》2004,65(2):143-150
OBJECTIVE: To determine whether serum concentrations of biomarkers of skeletal metabolism can, in conjunction with radiographic evaluation, indicate severity of osteochondrosis in developing horses. ANIMALS: 43 Dutch Warmblood foals with varying severity of osteochondrosis. PROCEDURE: 24 foals were monitored for 5 months and 19 foals were monitored for 11 months. Monthly radiographs of femoropatellar-femorotibial and tibio-tarsal joints were graded for osteochondral abnormalities. Serial blood samples were assayed for 8 cartilage and bone biomarkers. At the end of the monitoring period, foals were examined for macroscopic osteochondrosis lesions. RESULTS: Temporal relationships were evident between certain serum biomarkers and osteochondrosis severity in foals during their first year. Biomarkers of collagen degradation (collagenase-generated neoepitopes of type-II collagen fragments, type-I and -II collagen fragments [COL2-3/4C(short)], and cross-linked telopeptide fragments of type-I collagen) and bone mineralization (osteocalcin) were positive indicators of osteochondrosis severity at 5 months of age. In foals with lesions at 11 months of age, osteochondrosis severity correlated negatively with COL2-3/4C(short) and osteocalcin and positively with C-propeptide of type-II procollagen (CPII), a collagen synthesis marker. Radiographic grading of osteochondrosis lesions significantly correlated with macroscopic osteochondrosis severity score at both ages and was strongest when combined with osteocalcin at 5 months and CPII at 11 months. CONCLUSIONS AND CLINICAL RELEVANCE: The ability of serum biomarkers to indicate osteochondrosis severity appears to depend on stage of disease and is strengthened with radiography. In older foals with more permanent lesions, osteochondrosis severity is significantly related to biomarker concentrations of decreased bone formation and increased cartilage synthesis. 相似文献