首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献，搜索用时 78 毫秒
1.
探讨猪精子在mTBM和TALP中分别获能2、3、4、5h和6h对体外获能的影响,并研究最适获能时间的精子体外受精的效果。结果表明:随着获能时间的延长,猪精子顶体反应率逐渐升高、质膜完整性逐渐下降,获能6h时的顶体反应率显著高于其他时间组,分别为52.5%和50.8%(P<0.05);质膜完整性显著低于其他时间组,分别为30.5%和31.4%(P<0.05);可获能4h的超激活运动率显著高于其他时间组,分别为56.6%和54.5%。将鲜精与冻融的精子获能4h后与成熟的猪卵母细胞进行体外受精,mTBM处理组的卵裂率显著高于TALP,分别为42.7%与40.2%和35.9%与33.4%,但鲜精与冷冻精液组间差异不显著。  相似文献   

2.
牦牛卵母细胞的体外成熟、种间受精与胚胎培养   总被引：1，自引：0，他引：1  
探讨了卵母细胞体外成熟时间、卵母细胞质量、精子准备和受精卵培养体系对牦牛卵母细胞种间体外受精效果的影响。结果表明:牦牛卵母细胞随体外成熟培养时间延长,第一极体排出率增加,囊胚发育率以成熟培养24 h最高;A级卵母细胞种间受精后囊胚的发育率(48.77±3.76)%显著高于B级(32.05±5.24)%和C级(7.54±7.18)%(P<0.05);BO液洗涤离心处理的精子受精后卵裂率(82.53±6.54)%显著高于Percoll液分离精子受精后的卵裂率(67.39±4.50)%(P<0.05),而两者囊胚率差异不显著((42.32±4.13)%vs(35.59±5.62)%,P>0.05);荷斯坦奶牛精子浓度在1×106～5×106/mL范围与牦牛卵母细胞受精效果差异不显著。卵丘细胞、输卵管上皮细胞共培养和SOF液培养种间受精卵,其卵裂率差异不显著,但共培养组的桑葚胚、囊胚和孵化胚发育率均显著高于SOF液培养组。  相似文献   

3.
猪的体外受精受温度、多精受精等因素影响一直效率较低.本文研究了卵巢生理状态、精子荻能时间及精卵共孵育时间对猪体外受精及胚胎发育的影响.实验结果表明:(1)从存在黄体的卵巢上获取的猪卵母细胞成熟率和卵裂率均显著高于从无黄体存在的卵巢上获取的卵母细胞(P＜0.01),但囊胚率无显著差异.(2)精子在受精液中获能20 min...  相似文献   

4.
《畜牧与兽医》2019,(12):19-24
应用体外受精(in vitro fertilization, IVF)等生物技术可以缩短种猪培育时间,地方猪精液的冷冻保存可以解决保存和运输问题。通过对不同个体冷冻前后的精子质量、获能方式、卵子质量及多精受精率对IVF的影响进行了研究。结果显示:当精子活率从83.26%降至74.20%时,IVF的卵裂率、桑椹胚率显著下降(P0.05)。不同的获能方式对IVF胚胎的卵裂率无显著影响(P0.05)。3层(及以上)卵丘细胞的卵子IVF的卵裂率、桑椹率显著高于3层以下组(P0.05)。冷冻精子的IVF中,2-细胞、4-细胞和囊胚的发育能力显著低于新鲜精子(P0.05),受精后6～12 h的多精受精率也显著高于新鲜精子组(P0.05)。猪体外受精胚胎的发育能力受精子和卵母细胞的影响。无论使用新鲜精液还是冷冻精液的IVF胚胎,在桑椹胚期后的发育能力都会受到阻碍,多精受精可能是原因之一,但具体原因还需要更多的研究。  相似文献   

5.
《畜牧与兽医》2015,(12):17-24
精液质量参数相似公猪获得相同体外受精(in vitro fertilization,IVF)效果时所需精卵比不同的原因。常规方法鉴定公猪精液质量参数,以不同精卵比进行体外受精并确定不同公猪精液体外受精时的最佳精卵比,分别检测了各公猪精子结合透明带能力、获能及顶体反应状况。3头试验用公猪(A、B和C)精液在精子密度、活率、活力和畸形精子率上无显著差异(P0.05),17℃保存3 d内精子的活率在三者间无差异(P0.05)。3头公猪精液在IVF中达到最佳受精效率时所需的精卵比分别为500∶1、1 000∶1和200∶1。精子结合透明带能力和获能进程检测显示三者无显著差异(P0.05),但顶体反应进程检测显示三者间具有显著差异(P0.05)。顶体反应进程差异是导致相似精液质量精液之间在IVF中最佳精卵比不同的主要原因。  相似文献   

6.
为比较不同获能方法对绵羊精子的获能效果，新鲜绵羊精液分别经肝素上游法(swim-up)、钙离子载体(IA，A23187)诱导法、Percoll离心法和Percoll离心后肝素孵育法进行精子获能的诱导后与体外成熟的绵羊卵母细胞进行体外受精，并利用金霉素荧光染色（chlortetracycline，CTC）法结合各自相应的体外受精结果对其获能效果进行检验。结果显示上游法处理后精子的获能比例和受精后的卵裂率均高于其它组, 说明肝素上游法可以较好的诱导绵羊精子获能。  相似文献   

7.
为研究不同浓度咖啡因对马鹿精子体外获能的作用,取健康马鹿冻精,分别以0、1.0、2.5、5.0、10.0 mmol/L咖啡因处理液作用精子,在孵育0、15、30、60、120、240 min的各个时间点取样,观察精子活力,并用考马斯亮蓝染色法检测各组精子的顶体反应(AR)。结果表明:咖啡因浓度为5.0 mmol/L时精子活力最高(80.19±0.52%),马鹿精子顶体反应率最高(61.94±1.50%),与对照组相比差异极显著(P<0.01),咖啡因作用30 min时各组的顶体反应率达到最高值。  相似文献   

8.
为了提高牛体外受精效果,试验从性控冷冻精液体外获能方法及抗氧化剂的添加、体外成熟24h后卵母细胞是否部分脱除卵丘细胞3个方面,研究了影响牛性控精液体外受精效率的关键技术。结果表明,一次离心体外获能法体外受精卵裂率[(68.3±3.7)%]、囊胚率[(30.9±2.3)%]与精子上浮获能法体外受精卵裂率[(67.8±2.6)%]、囊胚率[(29.7±3.7)%]无显著差异(P>0.05),但显著高于二次离心体外获能法体外受精卵裂率[(56.1±4.1)%]、囊胚率[(21.6±4.6)%](P<0.05);获能液和体外受精液添加1.0%抗坏血酸组体外受精卵裂率[(70.2±3.2)%]、囊胚率[(35.0±4.7)%]显著高于不添加组体外受精卵裂率[(60.0±4.5)%]、囊胚率[(28.3±3.6)%](P<0.05);在体外受精前,成熟卵母细胞周围的卵丘细胞脱除情况为部分脱除组体外受精卵裂率[(70.1±4.6)%]、囊胚率[(35.5±3.7)%]显著高于不脱除组体外受精卵裂率[(52.9±4.1)%]、囊胚率[(26.1±3.6)%](P<0.05)。由此可见,性控精液体外受精时,获能方法宜采用一次离心体外获能法或上浮获能法,且精子获能液和体外受精液中宜添加抗坏血酸;体外受精前,成熟卵母细胞部分脱除卵丘细胞对于提高性控精液体外受精胚胎发育率具有重要意义。  相似文献   

9.
为探讨褪黑素、亚牛磺酸、左旋肉毒碱三种抗氧化剂对牛精子体外获能效果的影响,将荷斯坦牛细管冻精解冻后,各取200μL精液分别添加在含10~(-4) M褪黑素(MLT)、20μM亚牛磺酸(HT)、10 mM左旋肉毒碱(LC)的获能液中,经上游处理45 min,采用目测法、金霉素(CTC)染色法评估三种抗氧化剂对牛精子活力、精子获能状态的影响。结果表明:添加10~(-4) M MLT、20μM HT、10 mM LC经上游法获能处理后的牛精子活力(83.67%、80.65%、75.00%vs 66.67%)均显著高于对照组(P0.05),而顶体反应率(9.87%、10.09%、14.30%vs 18.73%)均显著低于对照组(P0.05)。另外,添加10 mM LC、10~(-4) M MLT组获能处理后B型精子所占比率(37.26%、29.84%vs 16.26%)均显著高于对照组(P0.05),且10 mM LC组精子获能率最高;而20μM HT组与对照组无明显差异(22.80%vs 16.26%,P0.05)。因此,添加10 mM LC、10~(-4) M MLT可改善精子体外获能效果,有助于提高体外受精的受精率及早期胚胎的质量。  相似文献   

10.
试验为延边黄牛体外胚胎产业化生产奠定基础,进行了肝素、咖啡因、丙酮酸钠、BSA对延边黄牛体外受精效果的影响研究。结果表明,以改良BO液为基础液,添加20 μg/mL肝素时,精子顶体反应率和受精率分别为82.52%和75.34%,高于添加20 μg/mL咖啡因组(P<0.05)和添加10 μg /mL肝素与10 μg/mL咖啡因协同作用组(P>0.05);结合使用肝素(20 μg/mL),添加0.0020 g/mL丙酮酸钠时,精子顶体反应率和受精率分别为78.13%和71.57%, 高于添加0.0015 g/mL和0.0025 g/mL丙酮酸钠组(P<0.05);结合使用肝素(20 μg/mL),添加0.006 g/mL BSA时,精子顶体反应率和受精率分别为80.78%和71.44%,高于添加0.001 g/mL和0.003 g/mL BSA组(P<0.05)。因此,添加适当浓度的肝素、丙酮酸钠和BSA可显著提高延边黄牛精子体外获能效果及体外受精率。  相似文献   

11.
1-(2-Chloroethyl)3-cyclohexyl-1-nitrosourea (CCNU) is an alkylating agent in the nitrosourea subclass. A prospective evaluation of CCNU was done to determine the maximally tolerated dosage of CCNU in tumor-bearing cats. Response data were obtained when available. Twenty-five cats were treated with CCNU at a dosage of 50-60 mg/m3 body surface area. Complete hematologic data were available for 13 cats. Neutropenia was the acute dose-limiting toxicity. The median neutrophil count at the nadir was 1,000 cells/microL (mean, 2,433 cells/microL; range, 0-9,694 cells/microL). The time of neutrophil nadir was variable, occurring 7-28 days after treatment, and counts sometimes did not return to normal for up to 14 days after the nadir. Based on these findings, a 6-week dosing interval and weekly hematologic monitoring after the 1st treatment with CCNU are recommended. The nadir of the platelet count may occur 14-21 days after treatment. The median platelet count at the nadir was 43,500 cells/microL. No gastrointestinal, renal, or hepatic toxicities were observed after a single CCNU treatment, and additional studies to evaluate the potential for cumulative toxicity should be performed. Five cats with lymphoma and 1 cat with mast cell tumor had measurable responses to CCNU. Phase II studies to evaluate antitumor activity should be completed with a dosing regimen of 50-60 mg/m3 every 6 weeks.  相似文献   

12.
Human and equine athletes are reported to have a high prevalence of gastric disease, and anecdotal evidence suggests a similar phenomenon applies to racing sled dogs. To investigate the prevalence of gastric disease in racing sled dogs, we conducted 2 gastroscopy studies on dogs competing in the annual Iditarod Sled Dog Race. A pilot study of dogs that were either dropped from the 2000 Iditarod Sled Dog Race because of illness or that finished the race indicated that, approximately 5 days after competing, 10 of 28 dogs (35%) had endoscopic evidence of gastric ulceration, erosion, or hemorrhage. The next year, an endoscopic study of 73 dogs participating in the 2001 Iditarod race was performed in order to evaluate a larger population of dogs. Data from 70 of these dogs could be used; 34 (48.5%) had ulceration, erosion, gastric hemorrhage, or some combination of these findings. When this group of 70 dogs was compared retrospectively to a control group of 87 dogs presented to the Texas A&M University (TAMU) Veterinary Medical Teaching Hospital, the Iditarod sled dogs had a significantly higher prevalence (P = .049) of gastric lesions. These findings suggest that, similar to athletes of other species, elite canine athletes have an increased prevalence of gastric disease compared to the canine population at large.  相似文献   

13.
Continuous rate infusion (CRI) of furosemide in humans is considered superior to intermittent administration (IA). This study examined whether furosemide CRI, compared with IA, would increase diuretic efficacy with decreased fluid and electrolyte fluctuations and activation of the renin-angiotensin-aldosterone system (RAAS) in the horse. Five mares were used in a crossover-design study. During a 24-hour period, each horse received a total of 3 mg/kg furosemide by either CRI (0.12 mg/kg/h preceded by a loading dose of 0.12 mg/kg IV) or IA (1 mg/kg IV q8h). There was not a statistically significant difference in urine volume over 24 hours between methods; however, urine volume was significantly greater after CRI compared with IA during the first 8 hours ([median 25th percentile, 75th percentile]: 9.6 L [8.9, 14.4] for CRI versus 5.9 L [5.3, 6.0] for IA). CRI produced a more uniform urine flow, decreased fluctuations in plasma volume, and suppressed renal concentrating ability throughout the infusion period. Potassium, Ca, and Cl excretion was greater during CRI than IA (1,133 mmol [1.110, 1,229] versus 764 mmol [709, 904], 102.7 mmol [96.0, 117.2] versus 73.3 mmol [65.0, 73.5], and 1,776 mmol [1,657, 2.378] versus 1,596 mmol [1,457, 1,767], respectively). Elimination half-lives of furosemide were 1.35 and 0.47 hours for CRI and IA, respectively. The area under the excretion rate curve was 1,285.7 and 184.2 mL x mg/mL for CRI and IA, respectively. Furosemide CRI (0.12 mg/kg/h) for 8 hours, preceded by a loading dose (0.12 mg/kg), is recommended when profound diuresis is needed acutely in horses.  相似文献   

14.
Tropical Animal Health and Production -  相似文献   

15.
The epidemiology of H. placei and of other gastrointestinal nematodes in yearling dairy cattle was examined on two farms in Kiambu District, central Kenya during each of 13 one-month periods from April 1993 to April 1994. On each farm, 32 newly weaned dairy calves were given a single dose of albendazole and then placed on experimental pastures. Twelve of the animals were designated for bi-monthly slaughter (n = 2) and analysis of worm population characteristics and 20 were designated for blood and faecal collection and for weighing. Two parasite-free tracer calves were grazed alongside the weaner calves each month throughout the study period and were also slaughtered for analysis of worm populations. Faecal egg counts, haematological and serum pepsinogen determinations, herbage larval counts, and animal live weight changes were recorded monthly. The study revealed that Haemonchus placei, Trichostrongylus axei, Cooperia spp. and Oesophagostomum radiatum were responsible for parasitic gastroenteritis and that H. placei was the predominant nematode present in the young cattle on both farms. Faecal egg counts from resident cattle and necropsy worm counts revealed that pasture larval levels were directly related to the amount of rainfall. The total worm burdens in the animals were highest during the rainy season (March–June and October–December) and lowest during the dry seasons (July–September and January–February). The very low recovery of immature larvae of H. placei from the tracer calves indicated that arrested development is not a feature of the life cycle of this parasite in central Kenya. The maintenance of the parasite population depended on continuous cycling of infection between the host and the pasture. The agroclimatic conditions of the study area were such that, in general, favourable weather conditions for the development and survival of the free-living stages of gastrointestinal nematodes existed all year round.  相似文献   

16.
The occurrence of ectoparasites in sheep flocks is frequently reported but seldom quantified. Sheep production used to be a predominantly family activity in the state of Sa~o Paulo (Brazil), but it began to become a commercial activity in the past decade. Thus, information about the ectoparasites existing in sheep flocks has become necessary. The present data were obtained by means of questionnaires sent to all sheep breeders belonging to the `Associaça~o Paulista de Criadores de Ovinos' (ASPACO; Sa~o Paulo State Association of Sheep Breeders). Response reliability was tested by means of random visits paid to 10.6% of the respondents. Most of the properties (89.5%) reported the presence of one or more ectoparasites. Screw-worm (Cochliomyia hominivorax) was the most frequent ectoparasite (72.5%), followed by bot fly larvae (Dermatobia hominis, 45.0%), ticks (Amblyomma cajennense) and Boophilus microplus, 31.3%) and finally lice (Damalinia ovis, 13.8%). Combined infestations also occurred, the most common one being screw-worm with bot fly larvae (36.0%) followed by bot fly larvae with ticks (13.9%), screw-worm with ticks (9.3%), bot fly larvae with lice (6.9%), and ticks with lice (5.0%). The most common triple combination was screw-worm, bot fly larvae and ticks (12.8%). Breeds raised for meat or wool were attacked by bot fly larvae and ticks more often than other breeds. Lice were only absent from animals of indigenous breeds. The relationships among these ectoparasites are discussed in terms of sheep breeds, flock size, seasonality and the ectoparasitic combinations on the host.  相似文献   

17.
Our particular attention in this article was given to natural mediators for macrophages isolated from the sites of tissue injury. A number of chemotactic factors, which may satisfy many criteria making them acceptable as inflammatory leucocyte chemotactic factors, has been separated. Among them, our laboratory has isolated three macrophage (monocyte) chemotactic factors (MCF-a, -b and -c). Their purification, characterization and functional specificity are discussed.  相似文献   

18.
Comparison of different tests to diagnose feline infectious peritonitis   总被引：1，自引：0，他引：1  
  相似文献   

19.
An experiment was conducted to study disappearance of C14 to C18 fatty acids, lag times and biohydrogenation (BH) rates of C18 fatty acids of ground soya bean and canola seeds in situ. Three ruminally fistulated Dallagh sheep were used to determine ruminal BH of unsaturated fatty acids (UFAs). Differences in the disappearance of fatty acids through the bags and lag times were observed between the oilseeds. We saw that the longer the incubation time of the oilseeds in the rumen, the lower the content of C18:2 and C18:3. Significantly higher lag times for both C18:2 and C18:3 were observed in ground canola compared to ground soya bean. BH rates of C18:2 and C18:3 fatty acids in soya bean were three times higher than those of canola. These results suggest that the fatty acid profile of fat source can affect the BH of UFAs by rumen micro‐organisms. So that UFAs of canola had higher ability to escape from ruminal BH. It seems that fatty acid profile of ruminant products is more affected by canola seed compared to soya bean seed.  相似文献   

20.
Serum biochemical values and the wet weight to dry weight ratios of tissues were determined in yaks in Shandan county of Gansu province. The liver, kidney, heart and muscle contents of seven elements in yaks were also analysed. Most serum biochemical values were similar to those of cattle, camels and sheep, but the calcium concentration was considerably above the normal range for other ruminants. The liver contained the highest concentrations of copper, manganese and cobalt and the kidney of selenium, iron and calcium.Abbreviations Alb albumin - ALT alanine aminotransferase - AST aspartate aminotransferase - BUN blood urea nitrogen - Chol cholesterol - Glob globulin - -GT -glutamyl transpeptidase - IP inorganic phosphorus - TP total protein  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号