Number of Follicular Waves and Their Effect on Pregnancy Rate in the Cow     

HA Çelik  &#; Ayd&#;n  S &#;enda&#;  DA Dinç 《Reproduction in domestic animals》2005,40(2):87-92

In the study, the relationship of follicular growth waves, oestradiol and pregnancy rates were investigated during oestrus cycle in cows. A total of 22, Brown Swiss cows (3-5 years old) were used for the study. The ovaries of animals were examined from sixth day of cycle to next oestrus by ultrasound. The follicles that were present in the ovarium were recorded. Follicular growth was observed every day by means of ultrasound examination. The blood samples were taken for analysis of oestradiol simultaneously with ultrasound examinations. The oestrus animals were inseminated. Each animal that inseminated was examined by ultrasound on day 28 after insemination for pregnancy diagnosis. Two follicular growth waves were observed in nine of 22 (40.9%), three waves in 13 of 22 (59.1%) animals. The oestradiol was found in the same concentration but in different release patterns between two and three waves animals. Pregnancy rate in cows with three and two follicular waves did not differ. In conclusion, emergence of three waves of follicular growth was higher in Brown Swiss cows, the analysis of oestradiol could be used for determination of the wave numbers and the animals with different waves may have had the same pregnancy rates.  相似文献   

Molybdenum poisoning in feedlot cattle     

DA SWAN  JH CREEPER  CL WHITE  M. RIDINGS  GM SMITH  ND COSTA 《Australian veterinary journal》1998,76(5):345-349

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母鼠妊娠期铅镉联合暴露对仔鼠脑组织的氧化损伤及乙酰半胱氨酸的保护效应     

路浩  达剑森梅莉张英  王林卓丽玲  刘宗平 《中国兽医科技》2008,38(1):42-45

45只怀孕SD母鼠被随机分为9组,即A组（对照组,饮用蒸馏水）、B组（铅组,300mg／L）、C组[铅＋N-乙酰半胱氨酸（N-NAC）组,300mg／L＋20mmol／L]、D组（镉组,10mg／L）、E组（镉＋NAC组,10mg／L＋20retool／L）、F组（低剂量铅镉联合组,150mg／L＋5mg／L）、G组（低剂量铅镉联合＋NAC组,150mg／L＋5mg／L＋20mmol／L）、H组（高剂量铅镉联合组,300mg／L＋10mg／L）、Ⅰ组（高剂量铅镉联合＋NAC组,300mg／L＋10mg／L＋20mmol／L）。采用饮水染毒,染毒时间为21d,分娩后每窝随机选取6只乳鼠测定脑匀浆超氧化物歧化酶（SOD）、过氧化氢酶（CAT）、谷胱甘肽过氧化物酶（GSH—Px）、乙酰胆碱酯酶（TChE）活性和丙二醛（MDA）的含量。结果表明,低剂量铅镉联合作用具有中间效应（介于铅、镉单独毒性作用之间）,而高剂量铅镉联合作用表现协同或叠加效应。NAC拮抗组与染毒组比较,MDA含量显著降低,SOD、GSH—Px、TChE、CAT活性有升高趋势,说明NAC可以提高大鼠的抗氧化能力,对母鼠铅镉暴露所致新生鼠脑脂质过氧化损伤有一定的保护作用。  相似文献   

宁夏吴忠地区奶牛临床型乳房炎主要病原菌的分离鉴定及耐药性分析     

宋倩  达举云  李怡娜  史金莲  李宗帅  赵兴绪  张勇 《动物医学进展》2022,43(2):70-75

为了解宁夏吴忠地区奶牛乳房炎的主要病原菌及其耐药情况,采集56份罹患乳房炎的奶牛乳样进行病原菌分离,并对分离菌进行了生化鉴定、16S rRNA基因序列分析、药敏试验以及耐药基因检测.结果表明,该地区的主要病原菌为大肠埃希氏菌和无乳链球菌,检出率分别为23.2％和14.3％.药敏试验结果表明,大肠埃希氏菌主要对头孢他啶、...  相似文献   

蒙古虫实化学成分预试验     

赵宝玉  王建军  达能太  张战峰  马冬青 《动物医学进展》2007,28(4):25-29

采用植物化学成分系统预试和专项预试相结合的方法,对采自内蒙古阿拉善盟左旗草场的蒙古虫实地上部分全草进行了化学成分预试验.结果表明,蒙古虫实中含有生物碱、糖、甙类、氨基酸及多肽、皂甙、鞣质、有机酸、黄酮、挥发油、蒽醌;可能含有甾体和三萜类物质、强心甙、香豆素或萜类内脂、酚类物质;不含氰甙和脂肪族硝基化合物.  相似文献   

兴安落叶松天然林不同林分结构林木水平分布格局特征研究   总被引：3，自引：1，他引：3       下载免费PDF全文

玉宝  乌吉斯古楞  王百田  王立明  达布希拉图 《林业科学研究》2010,23(1):83-88

通过样地调查,分析了不同结构草类-落叶松林和杜香-落叶松林林木分布格局特征。研究表明:(1)年龄36 - 65年草类-落叶松林和年龄54 - 63年杜香-落叶松林分布格局中,均匀分布、随机分布和聚集分布所占比例分别为6.2%、50%、43.8%;(2)按林型分,草类-落叶松林分布格局中,均匀分布和随机分布所占比例均11.1%,聚集分布占77.8%。杜香-落叶松林分布格局均为随机分布;(3)树种组成在6落4阔 - 10落范围内,草类-落叶松林和杜香-落叶松林分布格局主要为聚集分布和随机分布两种类型。聚集分布主要集中在树种组成7落3阔 - 9落1阔范围内。  相似文献   

西部地区高校武术竞技水平发展现状研究——以新疆维吾尔自治区为例     

答邦俊 《上海交通大学学报(农业科学版)》2013,(1):111-114

采用数据分析法、问卷调查法和文献资料法,以2011年新疆自治区大学生武术竞赛为研究视角和研究对象,对西部地区高校竞技武术水平现状进行分析和研究。研究发现,目前新疆37所普通高校中石河子大学、新疆医科大学竞技武术水平较为突出,其次是新疆大学和新疆师范大学,新疆昌吉学院和教育学院竞技武术训练发展较为普及和重视。分析认为,影响西部地区高校竞技武术发展水平的因素有高校武术运动员选材机制和培养模式、高校体育竞技武术管理模式、武术文化底蕴和校园武术文化氛围等多方面因素。  相似文献   

Modeling the Exchanges of Energy, Water, and Carbon Between Continents and the Atmosphere   总被引：19，自引：0，他引：19  

PJ Sellers  RE Dickinson  DA Randall  AK Betts  FG Hall  JA Berry  GJ Collatz  AS Denning  HA Mooney  CA Nobre  N Sato  CB Field  A Henderson-Sellers 《Science (New York, N.Y.)》1997,275(5299):502-509

Atmospheric general circulation models used for climate simulation and weather forecasting require the fluxes of radiation, heat, water vapor, and momentum across the land-atmosphere interface to be specified. These fluxes are calculated by submodels called land surface parameterizations. Over the last 20 years, these parameterizations have evolved from simple, unrealistic schemes into credible representations of the global soil-vegetation-atmosphere transfer system as advances in plant physiological and hydrological research, advances in satellite data interpretation, and the results of large-scale field experiments have been exploited. Some modern schemes incorporate biogeochemical and ecological knowledge and, when coupled with advanced climate and ocean models, will be capable of modeling the biological and physical responses of the Earth system to global change, for example, increasing atmospheric carbon dioxide.  相似文献   

西藏三大优良牦牛类群产乳性能及乳品质分析   总被引：10，自引：3，他引：10  

姬秋梅  普穷  达娃央拉  次仁德吉  达瓦曲吉 《甘肃农业大学学报》2000,35(3):269-276

1997-1998年对嘉黎、帕里、斯布三大优良类群的成年母牦牛进行了产奶性能的测定与乳品分析,结果表明帕里牦牛的产乳量最高(199.80 kg);其次是斯布牦牛(179.70 kg);嘉黎牦牛最低(147.00 kg),产乳量均低于国内外其他牦牛。乳品分析结果为帕里牦牛乳蛋白质含量为5.73 %,乳脂率为5.95 %,乳糖为3.77 %;斯布牦牛为5.27 %,7.50 %,3.49 %;嘉黎牦牛为5.10 %,6.75 %,3.56 %,并且发现嘉黎牦牛乳中含有微量的硒(0.0064 mg/kg)。  相似文献   

Clinical,pathological and epidemiological aspects of flood plain staggers,a corynetoxicosis of livestock grazing Agrostis avenacea     

EO Davis  GE Curran  WT Hetherington  DA NORMS Norms  GA Wise  IJ Rothi  AA Seawright  WL Bryden 《Australian veterinary journal》1995,72(5):187-190

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