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猪卵巢卵母细胞的体外成熟和体外受精 总被引：8，自引：0，他引：8
将从屠宰母猪卵巢采得的卵母细胞-卵丘细胞复合体(Oocyte-cumulus Cell Complex.OCC)在含PMSG的M199培养40～44小时,卵丘细胞大部分扩散(86.4％)。48.1％(142/295)的卵母细胞排出第一极体(PBI)。将体外成熟的卵母细胞与体外获能精子授精后30～70小时,80.5％(103/128)的卵母细胞受精并可在体外发育到2～8细胞甚至桑椹胚。本文还对裸卵母细胞的体外成熟和体外受精进行了研究,对体外受精卵的早期发育作了观察。实验结果表明:PMSG对诱导卵丘细胞扩散及卵母细胞的全面成熟有重要作用,在OCC中的卵母细胞成熟率高于裸卵母细胞体外授精后8～10小时将受精卵放入改良KRB液培养可使卵裂比例明显提高。 相似文献
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屠宰母牛卵巢卵母细胞体外受精与发育的研究 总被引：13，自引：1，他引：12
将从屠宰母牛卵巢采得的卵母细胞用含有LH或hCG的M199培养24～26小时,然后用经钙离子载体Ionophore A23187诱导获能的牛新鲜或冷冻精子进行授精处理。授精6～7小时后再用含有乳酸钠和EDTA的M199培养至48～60小时后观察受精及受精卵的发育情况。结果表明,卵子的受精率及受精卵的发育率与卵母细胞成熟用培养基、授精用精子(新鲜或冷冻)以及供卵牛的品种均有关系。将用含有hCG的M199培养成熟的卵子,以获能处理过的新鲜精子授精后,其受精率和受精卵子中单精子受精并发育为2～8细胞期胚的比率在蒙古牛为91.4％(265/200)和19.6％(52/265),在黑白花奶牛为69.7％(62/89)和4.8％(3/62)。 相似文献
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论述牛卵母细胞体外成熟和体外受精的最新研究进展，包括卵丘卵母细胞复合体、卵母细胞的体内、体外成熟，以及体内、体外的异常成熟和卵母细胞的体外成熟方法，无蛋白质、无血清系统的限定性培养液的研究进展，卵母细胞体外成熟状态与标志的某些理论上的突破；体外受精中精子供体的选择、精子活力和正常形态的选择、冷冻解冻精液的体外获能、精子的体外受精力，以及体外的异常受精；还论述了牛卵母细胞体外成熟和体外受精技术在家畜育种和胚胎克隆等方面的应用前景 相似文献
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牛卵母细胞体外成熟和体外受精技术的研究进展 总被引：4，自引：0，他引：4
论述了牛卵母细胞体外成熟和体外受精的最新研究进展，包括卵丘母细胞复合体、卵母细胞的体内、体外成熟、以及体内、体外的异常成熟和卵母细胞的体外成熟方法，无蛋白质、无血清系统的限定性培养液的研究进展，卵母细胞全外成熟与标志的某些理论上的突破性；体外受精中精子供体的选择、精子活力和正常形态的选择冷冻解冻精液的体外获能、精了的体外受精力，以及体外的异常受精，还论述了牛卵母细胞体外成熟和体外受精技术在家畜育种 相似文献
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探讨了卵泡液、受精时间和季节对绵羊卵母细胞体外培养效果的影响。从屠宰场采集羊卵巢,抽取卵巢表面2mm-6mm的卵泡卵母细胞,进行体外成熟培养;卵母细胞成熟后,与处理后的精子共同培养进行受精。结果表明,在卵母细胞成熟培养液中添加绵羊卵泡液（SFF）组的卵裂率和囊胚发育率均优于添加同等浓度的牛卵泡液（BFF）组;受精22、18、12h组的卵裂率分别为64.85%、54.39%、48.72%,受精22h和18h组间差异显著（P〈0.05）,受精22h组和12h组间差异极显著（P〈0.01）。秋季绵羊体外受精的卵裂率和囊胚率均高于夏季,差异显著（P〈0.05）,但秋季与春季相比差异不显著（P〉0.05）。因此,进行绵羊卵母细胞体外成熟培养时,培养液中添加SFF;受精时,精卵共培养时间为22h的效果较好。在绵羊的繁殖季节秋季进行体外受精较春季和夏季的结果好。 相似文献
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文章从卵母细胞的来源、精子体外获能、卵母细胞体外成熟、体外受精和体外受精早期胚胎培养五个方面综述了牛卵母细胞体外受精和体外成熟技术的研究进展.同时指出了影响精子体外获能的因素、影响卵母细胞成熟培养的因素、体外受精存在的问题及解决办法等.并且对影响该技术的主要因素进行了系统分析. 相似文献
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《黑龙江畜牧兽医》2010,(21)
为了解绵羊体外受精技术条件,比较研究了卵泡液、受精时间和季节对绵羊卵母细胞体外培养效果的影响。结果表明:在卵母细胞成熟培养液中添加绵羊卵泡液(SFF)组的卵裂率和囊胚率均优于添加同等浓度的牛卵泡液(BFF)组;受精22 h和18 h的囊胚率差异显著(P0.05),受精22 h和14 h的卵裂率差异极显著(P0.01)。秋季绵羊体外受精的卵裂率和囊胚率均高于夏季,差异显著(P0.05),但秋季与春季相比差异不显著(P0.05)。因此,进行绵羊卵母细胞体外成熟培养时,培养液中添加SFF受精时,精卵共培养22 h的效果较好。在绵羊的繁殖季节(秋季)进行体外受精较春季和夏季的结果好。 相似文献
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Rassnick KM Gieger TL Williams LE Ruslander DM Northrup NC Kristal O Myers NC Moore AS 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2001,15(3):196-199
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
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Furosemide continuous rate infusion in the horse: evaluation of enhanced efficacy and reduced side effects 总被引：1，自引：0，他引：1
Johansson AM Gardner SY Levine JF Papich MG LaFevers DH Fuquay LR Reagan VH Atkins CE 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2003,17(6):887-895
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
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Waruiru RM Thamsborg SM Nansen P Kyvsgaard NC Bogh HO Munyua WK Gathuma JM 《Tropical animal health and production》2001,33(3):173-187
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
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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
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Evaluation of biohydrogenation rate of canola vs. soya bean seeds as unsaturated fatty acids sources for ruminants in situ 
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下载免费PDF全文 S. Pashaei T. Ghoorchi A. Yamchi 《Journal of animal physiology and animal nutrition》2016,100(2):211-216
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
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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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A knowledge of the microbiological status of milk and of the different structures in the mammary glands has great importance
in elucidating the pathogenesis of mammary gland infections. The objective of this study was to evaluate the microbiological
status of various structures in the mammary glands from naturally infected dairy cows following slaughter. A total of 94 samples
of milk, 184 samples of mammary parenchyma, 168 samples of gland cisterns, and 168 samples of teat cisterns were collected
for microbiological examination. Microorganisms were detected in 59.9% of all samples, 67.0% of the milk samples, 70.1% of
the mammary parenchymas, 55.9% of the gland cisterns and 48.8% of the teat cistern samples. When all samples were considered,
coagulase-negative Staphylococcus were the most prevalent (35.7%) followed by coagulase-positive Staphylococcus (12.2%), Corynebacterium bovis (2.4%), Prototheca sp. (1.9%), and Streptococcus dysgalactiae (1.5%). There was a significantly higher occurrence of microorganisms in the milk and mammary parenchyma compared to the
gland cisterns and teat cisterns.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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Four grass plots were sequentially contaminated with goat faeces containing known numbers of unembryonated eggs of predominantly Haemonchus contortus and Trichostrongylus spp. between October 1982 and April 1983. Four other plots were similarly contaminated with sheep faeces between February and May 1987. An additional plot was repeatedly contaminated with sheep faeces from February to April 1987. Populations of free-living stages in faeces and of infective larvae (L3) in the herbage were subsequently monitored until the end of April and June of 1983 and 1987 respectively. During February and May 1987 two control cultures of sheep faeces were incubated in the laboratory at 25°C–30°C and at a constant temperature of 50°C and the free-living development was also monitored. L3 developed very readily in the faeces cultured at 25°C–30°C and in those spread on a grass plot in October, at the end of the wet season, but developed less on the plot contaminated in May at the start of the wet season. Worm eggs in faeces deposited on plots during the hot dry season (December to April) or incubated at 50°C died and disintegrated after 24–48 h exposure to the high environmental temperatures. The results indicate that it is unlikely that gastrointestinal nematodes of sheep and goats can develop or survive on open pasture during the dry season in the Nigerian derived savanna zone. 相似文献
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Acute phase proteins in dogs naturally infected with the Giant Kidney Worm (Dioctophyme renale) 下载免费PDF全文
下载免费PDF全文 Elizabeth M. S. Schmidt Mads Kjelgaard‐Hansen Funmilola Thomas Asta Tvarijonaviciute José J. Cerón P. David Eckersall 《Veterinary clinical pathology / American Society for Veterinary Clinical Pathology》2016,45(4):657-664