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1.
生殖激素对绵羊卵母细胞体外成熟的影响   总被引：1，自引：0，他引：1  
母羊体内生殖激素在不同季节的分泌水平是不同的，这就说明在不同季节，需要不同的生殖激素浓度刺激，才能使卵母细胞体外成熟效果达到最佳。由于本试验是在夏季绵羊乏情季节进行，所以通过对比FSH、LH和雌激素不同浓度对绵羊卵母细胞的体外成熟影响，期望优化出适合晋中绵羊夏季乏情季节体外成熟培养所需的生殖激素的添加方案，完善乏情季节晋中绵羊卵母细胞体外成熟的体系。  相似文献   

2.
试验采用梯度LH与E2的作用浓度比较卵母细胞的体外成熟率,并采用添加7.0μg/mLLH、1.3μg/mLE2研究季节性对绵羊卵母细胞体外成熟及胚胎发育能力的影响。结果表明:①LH与E2的作用浓度对非繁殖季节(5月)卵母细胞成熟率影响差异不显著(P>0.05),但以添加LH7.0μg/mL、E21.3μg/mL组卵母细胞成熟率较好。②LH与E2的作用浓度对繁殖季节(12月)卵母细胞成熟率影响差异不显著(P>0.05),以LH10.0μg/mL与E21.3μg/mL时卵母细胞成熟率较好。③湖羊和其他季节性发情绵羊卵母细胞的成熟率在繁殖季节(72.08%vs69.82%)与非繁殖季节(67.89%vs65.79%)差异不显著(P>0.05),但以繁殖季节的成熟率较高。④湖羊的卵母细胞在非繁殖季节与繁殖季节胚胎卵裂率(72.28%vs75.43%)、桑葚胚率(36.14%vs34.97%)差异不显著(P>0.05),繁殖季节囊胚率比非繁殖季节囊胚率偏高(16.18%vs14.40%)。  相似文献   

3.
不同添加成分对绵羊卵母细胞体外成熟的影响   总被引：2，自引：0，他引：2  
卵母细胞体外成熟是胚胎工程中的一项基础性研究。试验比较了不同添加成分对绵羊卵母细胞的体外成熟及其后续发育的影响。分析了EGF不同添加量、FSH∶LH的不同配比和不同大小卵泡的卵泡液对绵羊卵母细胞的体外成熟的影响。结果表明,①添加30ng/mLEGF的成熟率显著高于其他试验组（85.0%VS60.0%,71.7%,72.7%,P〈0.05）,并可提高绵羊孤雌激活胚的囊胚发育率;②成熟液中添加FSH1μg/mL,LH5.0IU/mL成熟率最高;③在绵羊卵母细胞成熟液中添加3%绵羊大卵泡液,在成熟率上极显著高于20%小卵泡液的添加组（78.6%VS36.5%,P〈0.01）,显著高于3%小卵泡液的添加组和未添加组（78.6%VS60.0%,67.5%,P〈0.05）。  相似文献   

4.
本试验对不同培养液以及添加不同浓度的生殖激素对6～8周龄雌鼠GV期卵母细胞成熟培养效果以及肝素钠对其成熟后体外受精效果的影响进行了研究。结果表明:以TYH为基础培养液的培养方式更适合于体外成熟培养;培养液中单独添加LH或同时添加LH和FSH对昆明小鼠卵母细胞体外成熟有促进作用,但只添加FSH对卵母细胞的成熟促进作用不明显;在小鼠受精液中肝素浓度应控制在10μg/mL为宜。  相似文献   

5.
本实验探讨了促性腺激素(FSH、LH)对猪卵母细胞体外成熟的影响,并最终找到了其合理的使用剂量.实验选取具有3层致密卵丘细胞层及均匀细胞质的猪卵丘-卵母细胞复合物(COCs)在体外进行成熟培养.体外成熟培养液为改良的TCM-199液,根据实验设计再添加不同浓度的FSH和LH.卵母细胞体外成熟培养条件为39 ℃、5%CO2与饱和湿度下,成熟培养48 h.培养结束后,以第1极体排出作为卵母细胞成熟的标准.在成熟液中添加LH浓度分别为1、5、10 IU/mL时,与没有添加FSH与LH的对照组(成熟率为15.9%)相比,成熟率有显著提高,前者成熟率分别为49.1%、30.0%、36.3%.LH浓度为1 IU/mL的实验组成熟率最高,显著高于对照组(P＜0.05);然后以成熟液中只添加浓度为1 IU/mL LH为对照组,实验组添加FSH浓度分别为1、5、10 IU/mL.结果表明,添加FSH浓度为5 IU/mL和10 IU/mL时其成熟率分别为40.1%、27.6%,低于对照组(49.0%).添加FSH浓度为1 IU/mL时其成熟率(49.1%)高于对照组(49.0%),但差异不显著(P＞0.05).试验表明,随着FSH与LH添加浓度逐渐增加,成熟率呈下降趋势.添加FSH与LH浓度均为1 IU/mL可得到最佳的成熟效果.  相似文献   

6.
本试验探讨了促性腺激素（FSH、LH）对猪卵母细胞体外成熟的影响,最终找到了其合理的使用剂量。在成熟液中添加LH浓度分别为1、5、10IU／mL时,与没有添加FSH与LH的对照组（15．9％）相比,成熟率有显著提高,成熟率分别为49．1％、30．0％、36．3％。LH浓度为1IU,mL的实验组成熟率最高,显著高于对照组（P〈0．05）;然后以成熟液中只添加1IU/mLLH为对照组,试验组分别添加1、5、10IU/mLPSH。试验结果表明：添加FSH浓度为5和10IU/ml时其成熟率分别为40．1％、27．6％,低于对照组（49．0％）。添加FSH浓度为1IU／mL时其成熟率（49．1％）高于对照组（49．0％）,但差异不显著（P〉0．05）。两组试验同时得出,随着LH与FSH添加浓度的增加,成熟率呈下降趋势。通过本试验结果得出,在体外成熟培养猪卵母细胞时,各添加1IU／mL LH与FSH时,得到最佳的成熟效果。  相似文献   

7.
实验主要研究促卵泡素(FSH)、促黄体素(LH)对延边黄牛卵母细胞体外成熟及重组胚发育的影响,从而提高延边黄牛体细胞克隆的效率。采集屠宰后延边黄牛卵巢,用抽吸法回收卵母细胞,然后在不同种类、浓度激素条件下进行卵母细胞的体外成熟培养,最后将成熟的卵母细胞进行核移植及重组胚的体外培养。实验分别比较了在0、5、10、15、20μg/mL条件下,单独使用FSH与LH和在15μg/mL的FSH与10μg/mL的LH共同作用下对延边黄牛卵母细胞体外成熟率、卵裂率和囊胚发育率的影响。结果表明:将卵母细胞单独置于加有浓度为15μg/mL的FSH和10μg/mL的LH的成熟液中培养,其成熟率及后期发育率优于其他浓度组(P<0.05);而2种最优浓度同时添加共同作用时要好于单独使用(P<0.05)。由试验可得出,成熟培养液中单独添加15μg/mL的FSH和单独添加10μg/mL的LH浓度对延边黄牛卵母细胞体外成熟及重组胚后期发育效果最好;使用最佳浓度进行协同作用时,其共同作用要好于单独使用的效果。  相似文献   

8.
FSH对绵羊卵母细胞体外核成熟的影响   总被引：2，自引：1，他引：1  
为了探讨FSH对绵羊卵母细胞核成熟的影响,本试验将绵羊卵母细胞体外成熟24 h,并在成熟过程中的4个不同时间段内添加FSH,统计各个时间段卵母细胞的生发泡破裂(germinal vesicle break down, GVBD)及第一极体排出情况。结果显示：①在体外成熟培养的前4 h或前8 h添加FSH,经体外成熟的卵母细胞其生发泡破裂率与不添加FSH组无显著差异;②在体外成熟的4~24 h或8~24 h添加FSH,其第一极体排出率与不添加FSH组有极显著差异。说明,在本试验条件下,FSH对绵羊卵母细胞体外成熟具有显著的促进作用,是在减数分裂的恢复后到减数分裂完成之间的某一阶段起的促进作用。  相似文献   

9.
为了建立针对山羊卵母细胞的理想体外成熟培养体系,本试验研究了在成熟培养液中添加不同浓度的促卵泡素(follicle stimulating hormone,FSH)、促黄体素(luteinizing hormone,LH),不同来源的FSH+LH对山羊卵母细胞体外培养成熟效果的影响。结果表明,采用TCM199添加10%FCS,1～2mg/L17β-E2,10mmol/LHepes,0.055mg/mL丙酮酸钠,2.2mg/mL NaHCO3,500μg/mL链霉素,500μg/mL青霉素,10mg/L FSH及20mg/LLH的培养体系,有利于山羊卵母细胞的体外成熟;进口的和国产FSH和LH对山羊卵母细胞成熟有相同促进效果。  相似文献   

10.
为了探究不同组分体外成熟培养基对绵羊卵母细胞体外成熟的影响,试验从健康绵羊卵巢中分离卵丘-卵母细胞复合体(COCs),将分离的COCs分为V-FSH+LH+E2+FBS组、V-FSH+FBS组、V-FSH+LH+E2+BSA组、P-FSH+LH+E2+FBS组、P-FSH+FBS组、P-FSH+LH+E2+BSA组,每组分别添加以V-促卵泡素(FSH,垂体中提纯的FSH)和P-FSH(体外基因重组表达的FSH)为基础设计的体外成熟培养基以进行体外成熟试验,即各组依次添加V-FSH+促黄体素(LH)+雌激素(E2)+胎牛血清(FBS)、V-FSH+FBS、V-FSH+LH+E2+牛血清白蛋白(BSA)、P-FSH+LH+E2+FBS、P-FSH+FBS、P-FSH+LH+E2+BSA体外成熟培养基,体外成熟后检测各组卵丘扩展指数(CEI)、第一极体排出率、卵母细胞氧化还原态、乳酸生成量、葡萄糖消耗量、ATP生成量;...  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  
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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   

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