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1.
本实验以农大褐父母代种鸡为材料，以甘油、乙二醇、ＤＭＡ和ＤＭＳＯ为主要冷冻保护剂的试验表明，乙二醇和ＤＭＡ的毒性较小；以Ａ液为稀释液，加抗冷冻剂ＤＭＡ的解冻精子活力为０．５５，且以１０％的ＤＭＡ浓度最佳，精子活力最高为０．６０，显著高于其它组（Ｐ＜０．０５）。以日液为稀释液的解冻结果表明，应用混合冷冻保护剂的保护效果较好，可获得０．４１～０．４５的精子活力，差异显著（Ｐ＜０．０５）。  相似文献   

2.
以１８Ｍ乙二醇或１６Ｍ丙二醇作抗冻剂冷冻牛胚胎,解冻后在Ｍ－ＰＢＳ中一步脱除抗冻剂体外培养或不脱除抗冻剂直接移植给受体母牛。结果表明用１８Ｍ乙二醇直接移植法的体外培养存活率和移植妊娠率均显著高于１６Ｍ丙二醇组,分别为８４８％比６５５％和４８５％比４００％（Ｐ＜００５）,但与对照组（１４Ｍ甘油常规法）之间无显著差异,分别为８４８％比８６７％和４８５％比５００％（Ｐ＞００５）。  相似文献   

3.
山羊精液冷冻过程中影响因素分析   总被引：4，自引：0，他引：4  
本试验采用三种稀释液配方，三种甘油浓度、三种卵黄浓度及三种始冻温度，按既定的程序对山羊精液进行冷冻解冻，逐步检查精液的活力和活精子百分率（简称活率）。并在采精之后，冷冻前、解冻后对精子进行电镜扫描超激结构观察，所有数据进行单因子差异显著性分析得出：三种稀释液中，Ｃ液最差，Ａ、Ｂ液差异显著（Ｐ＜０．０５），Ａ较好。三种甘油浓度冻精活率差异显著（Ｐ＜０．０５），６％最好。精子顶体损伤率随甘油浓度增加而增加。不同的卵黄浓度和始冻温度差异均不显著（Ｐ＞０．０５）。用含甘油６％的冻精对两只超排母羊输精，发情后第八天冲卵镜检，受精率达９７．０％，胚胎发育率达８７．３％。  相似文献   

4.
本文以农大褐父母代种鸡为材料，研究硫酸鱼精蛋白和谷氨酰胺对鸡精液冷冻效果的作用表明，Ａ０液＋ＤＭＡ和Ｂ０液＋甘油，解冻后精子活力分别为０．５３，０．４９，均显著高于其它组（Ｐ＜０．０５）；Ａ０液＋硫酸鱼精蛋白、Ａ０液＋谷氨酰胺，解冻后分别获得了０．４６，０．４１的精子活力，均显著高于对照组（Ｐ＜０．０５）；Ｂ０液各组试验效果差异均不显著（Ｐ＞０．０５）。  相似文献   

5.
牛体外受精胚冷冻保存的研究   总被引：9，自引：0，他引：9  
对牛卵泡卵母细胞体外受精（ＩＶＦ）１６８ｈ的致密桑椹胚、囊胚用常规快速冷冻法、预冷和不预冷的超快速冷冻法进行了冷冻保存试验。结果表明：ＩＶＦ囊胚采用含１０％甘油的常规快速冷冻法、含２．１ｍｏｌ／Ｌ甘油和０．２５ｍｏｌ／Ｌ蔗糖预冷５ｍｉｎ的一步冷冻法及含２５％甘油和２５％乙二醇预冷５ｍｉｎ的玻璃化冷冻法等３种方法进行冷冻保存，解冻后的继续发育率（６８．０％，５９．０％，６５．７％）均无显著差异（Ｐ＞０．０５），可用快速、简便、预冷的一步冷冻法或玻璃化冷冻法替代常规快速冷冻法；ＩＶＦ致密桑椹胚可用一步冷冻法（２．１ｍｏｌ／Ｌ甘油＋０．２５ｍｏｌ／Ｌ蔗糖）和玻璃化冷冻法（２５％甘油＋２５％乙二醇或２５％甘油＋２５％１，２－丙二醇）进行预冷的超快速冷冻保存；冻前预冷（５ｍｉｎ）能显著提高ＩＶＦ囊胚的冻后形态正常率和继续发育率（Ｐ＜０．０５）；ＩＶＦ囊胚冷冻—解冻后的继续发育率高于ＩＶＦ致密桑椹胚。  相似文献   

6.
以农大褐父母代鸡为材料，以甘油、乙二醇、ＤＭＡ和ＤＭＳＯ为主要冷冻保护剂的试验表明，乙二醇和ＤＭＡ的毒性较小，以Ａ液为稀释液，加抗冷冻剂ＤＭＡ的解冻精子活力为０．５５，且以１０％的ＤＭＡ浓度最佳，精子活力最高为０．６０，显著高于其它组（Ｐ〈０．０５）。以Ｂ液为稀释液的解冻结果表明，应用混合冷冻保护剂的保护效果较好，可获得０．４１￣０．４５的精子活力，差异显著（Ｐ〈０．０５）。  相似文献   

7.
本文研究了小鼠胚胎快速冷冻方法,以ＰＢＳ＋２．０Ｍ甘油＋０．５Ｍ蔗糖为冷冻液,以ＰＢＳ＋０．５Ｍ蔗糖为称释液。结果桑椹胚冷冻解冻后的存活率为６９．３％,早期囊胚冷冻解冻后的存活率为６０．４％,二者之间无显著差异。  相似文献   

8.
试验一按正交设计比较了三种浓度（０．５Ｍ，０．７５Ｍ和１．０Ｍ）的甘油和丙二醇、三种投液氮温度（－２５℃，－３５℃，－４５℃）、三种解冻温度（１０℃，２０℃，３７℃）对第７、第８天囊胚存活率的影响。结果甘油浓度以１．０Ｍ和０．７５Ｍ的效果较好，胚胎成１６率分别为５４．０％和５３．１％；而丙二醇以０．５Ｍ水平的成活率最高，为６１．６％；投液氮温度以－２５℃的效果最好；（成活率为５６．１％）；解冻温度则以２０℃、３７℃优于１０℃，成活率分别为５７．６％，５８．９％及３７．１％。试验二用０．７５Ｍ甘油十０．５Ｍ雨二醇及１．０Ｍ甘油＋０．５Ｍ丙二醇作为防冻剂，将胚胎降温至－２５℃后投入液氮，在２０℃水浴中解冻。结果两组胚胎的成活率均较高，分别为７９．０％和８０．０％（Ｐ＞０．０５）。  相似文献   

9.
牛体外受精胚胎一步脱防冻剂冷冻方法的研究   总被引：7，自引：1，他引：7  
为了研究适合于牛体外受精胚胎的一步除防冻剂的冷冻方法，特进行两个试验。试验１分别用１．５Ｍ甘油＋０．２５Ｍ蔗糖、１．５Ｍ乙二醇和１．５Ｍ丙二醇作防冻剂冷冻体外受精后第７天，已发育至囊胚阶段的牛胚胎。使胚胎降温至－７℃后，植冰，然后以０．３℃／分的速率降温至－３０℃，立即将胚胎投入液氮中冷冻保存。在３７℃水中解冻胚胎后，使其直接在含１５％胎犊血清（ＦＣＳ）的磷酸缓冲液（ＰＢＳ）中脱去防冻剂。经体外培养７２ｈ后，３组胚胎的孵化率分别为７７．２７％（１０２／１３２）、７３．２４％（１０４／１４２）、４７．９０％（５７／１１９），第１、２组的孵化率极显著高于第３组（Ｐ＜０．０１），说明用１．５Ｍ丙二醇溶液冷冻的胚胎，在解冻后不宜直接在ＰＢＳ中脱防冻剂。试验２比较用不同浓度（１．０Ｍ０１．５Ｍ，２．０Ｍ）的乙二醇和不同投液氮温度（－２５℃，－３０℃，－３５℃）冷冻胚胎的效果。结果表明乙二醇浓度和投液氮温度对胚胎孵化率均无显著影响（Ｐ＞０．０５），各组胚胎的孵化率变动于７４．４４％－８５．４８％之间。  相似文献   

10.
外源蛋白酶对仔猪生产性能,器官重的影响   总被引：2，自引：0，他引：2  
徐奇友  许红 《养猪》1995,(4):10-11
本试验在３５日龄断奶长哈杂交仔猪日粮中分别加入０．１％、０．５％浓度的Ｐ４、Ｐ７两种外源蛋白酶。在３５天试验中加酶日粮和对照日粮在平均日增重、饲料增重比差异不显著（Ｐ＞０．５）。０．５％Ｐ４蛋白酶降低了小肠鲜重（Ｐ＜０．０１）和小肠鲜重／空体重（Ｐ＜０．０５），提高了心脏重／空体重，与对照组差异显著（Ｐ＜０．０５）。  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.
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   

15.
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   

16.
Comparison of different tests to diagnose feline infectious peritonitis   总被引：1，自引：0，他引：1  
  相似文献   

17.
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   

18.
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   

19.
正We are pleased to publish the second special issue on avian brood parasitism and to be responsible guest editors for the two special issues of Chinese Birds (Vol. 3, No. 4, 2012 and Vol. 4, No. 1, 2013), entitled "Avian Brood Parasitism - A Growing Research Area in Behavioral Ecology". The first issue was published in December 2012. The goal of the two special issues is to publish accumulated knowledge and some of the recent developments in  相似文献   

20.
Tropical Animal Health and Production -  相似文献   

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