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1.
A D Shipp 《Journal of veterinary dentistry》1991,8(3):4-6
Crown reduction is a sterile endodontic procedure indicated for reducing the crown height of teeth. The procedure is used primarily on canine teeth as a disarming technique in aggressive biting pets or to treat traumatic occlusion. Recommendations for using this technique for biting pets are described. 相似文献
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Using recombinant gonadotropins for assisted reproduction of domestic species is still in its infancy. Yet, the purity, potency and pathogen-free nature of recombinant gonadotropins make them attractive alternatives to tissue-derived gonadotropic agents. In this study, the authors summarize the work to date using recombinant gonadotropins to enhance the - fertility of domestic animals and they discussed their recent studies examining the biopotency of single chain analogues of human gonadotropins. In these studies, single chain analogues of follicle stimulating hormone (Fcα), chorionic gonadotropin (CGβα) or a gonadotropin construct with dual activity (FcCGβα) were administered to sheep pre-treated with antisera directed against GnRH. Ovulation was induced 3 days after analogue administration using hCG (1000 IU, iv). Although Fcα or CGβα alone induced only modest oestradiol production during the pre-hCG period, serum concentrations of oestradiol were markedly increased (p < 0.05) 3 days after administration of FcCGβα or the Fcα + CGβα combination. Final ovarian weight was significantly increased (p < 0.05) in animals receiving Fcα, Fcα + CGβα or FcCGβα. Collectively, these observations demonstrate that the single chain analogues of the human gonadotropins are active in sheep. 相似文献
4.
绵羊在发情周期中各生殖激素浓度变化与卵泡发育、成熟和排卵有着密切的关系。为了研究巴美肉羊血清生殖激素的动态变化及其与排卵数关系,试验采用电化学法,测定了12只成年母羊发情期血清中2种类固醇激素(E2和P4)的浓度水平,分析其动态变化规律,并用SAS 9.0的方差分析程序分析激素浓度与排卵数的关系。结果表明,两种激素在排单卵组和排双卵组绵羊间变化规律不同,E2在排单卵组表现为先下降后升高的变化趋势,在排双卵组表现为持续下降趋势;P4在排单卵组表现为持续上升的趋势,在排双卵组为先上升后下降的变化趋势。排单卵和排双卵组绵羊在各时间点的E2和P4激素浓度差异均不显著(P>0.05)。 相似文献
5.
AR RABIEE KL MACMILLAN F SCHWARZENBERGER D THALLER MJ RATHBONE TE TRIGG 《Australian veterinary journal》2001,79(10):690-694
OBJECTIVE: To evaluate the potential of an implant of a GnRH-agonist (deslorelin) to create a progesterone free animal suitable for studying progesterone (P4) metabolism in intact cows by measuring blood P4 and faecal P4 metabolites. METHODS: Experiment 1: Eighteen non-lactating cycling Holstein-Friesian cows, 4 to 7 years old, were allocated to one of three groups to study plasma P4 concentrations preceding an intravaginal insert. These groups comprised: i) a deslorelin group (GnRH-agonist implanted); ii) a PGF group receiving two injections of prostaglandin (PGF2alpha) 12 days apart; and, iii) an ovariectomised (OVX) group. An intravaginal device (CIDR) was inserted into the vagina of each animal and left in place for 11 days. Plasma P4 concentrations were measured during the study period. Experiment 2: Twelve non-lactating cycling Holstein-Friesian cows, 4 to 7 years old, were allocated to two groups: i) a deslorelin group (GnRH-agonist implanted); and ii) an ovariectomised group. Plasma P4 and faecal P4 metabolites (20-oxo-pregnanes, 20alpha-OH and 20beta-OH) were monitored for a period of 5 weeks. RESULTS: Experiment 1: Average plasma P4 concentration did not differ between the three groups (1.28, 1.43 and 1.55 ng/mL for deslorelin, OVX and PGF cows, respectively, P = 0.8) during the period of supplementation. Experiment 2: There was no difference in plasma P4 (mean plasma P4 < 0.02 ng/mL, P = 0.9) and faecal P4 metabolites between deslorelin and OVX cows 2 weeks after the implantation (P = 0.7). CONCLUSIONS: These data showed that a GnRH-agonist (deslorelin) implant may be used as an alternative to ovariectomy to create a progesterone free animal suitable for studying the metabolism of administered P4. 相似文献
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【目的】 研究催乳素(PRL)对内蒙古绒山羊初级毛囊和次级毛囊体外生长及形态变化的影响。【方法】 机械法结合切割法分离内蒙古绒山羊的初级毛囊和次级毛囊,在初级毛囊培养液中分别添加0、5、10、50、100 ng/mL催乳素进行体外培养,每组24根,共培养5 d,每天在显微镜下观察其形态并拍照,统计其生长长度、生长速度和存活率,筛选出最适催乳素处理浓度。然后将初级毛囊与次级毛囊分别分为初级毛囊对照组(PF-K)、初级毛囊试验组(PF-PRL)、次级毛囊对照组(SF-K)、次级毛囊试验组(SF-PRL),每组24根,对照组用基础培养液培养,试验组在基础培养液中添加最适浓度的催乳素,培养5 d,每天观察毛囊的形态并拍照,同时测量各组毛囊的生长长度。【结果】 10 ng/mL催乳素组毛囊的平均日生长长度均极显著高于其他浓度组(P<0.01),最终生长长度和存活率均最高,因此,后续试验选择10 ng/mL催乳素处理毛囊。试验组和对照组初/次级毛囊的毛干与根鞘部位同时伸长,随着培养时间的增加均出现不同程度的弯曲。PF-PRL、SF-PRL组毛囊在2~5 d的总长度分别极显著高于PF-K、SF-K组(P<0.01)。PF-K组除第1天与第0天差异不显著外,1~5 d毛囊的总长度依次显著增加(P<0.05);PF-PRL组0~5 d毛囊的总长度依次显著增加(P<0.05)。SF-K组毛囊第5天的总长度显著高于0~4 d (P<0.05);SF-PRL组第4、5天毛囊的总长度均显著高于0~3 d (P<0.05),第3天毛囊的总长度显著高于0~2 d (P<0.05)。PF-PRL、SF-PRL组毛囊在2~5 d的平均日生长长度分别极显著高于PF-K、SF-K组(P<0.01)。【结论】 10 ng/mL催乳素是体外促进毛囊生长的最适浓度,10 ng/mL催乳素对体外培养的内蒙古绒山羊的初级毛囊和次级毛囊均有极显著的促生长作用。 相似文献
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Summary Examination by culture of single faecal samples from 120 domestic dogs in the Vom area of Nigeria showed 22 (18 per cent) of the animals to be excreting Salmonella organisms. One of the dogs yielded two and another three different serotypes. The total number of Salmonella serotypes isolated in the survey was 21. Dogs may be important in Nigeria as agents for the transmission of salmonellosis to man and domestic livestock.
Aislamiento De Salmonelas De Perros En Vom, Nordeste De Nigeria
Resumen Se cultivaron materias fecales de 120 perros domésticos en el área de Vom, nordeste de Nigéria. Los exámenes dieron como resultado el aislamiento de salmonelas del 18 por ciento de animales examinados. En uno de los perros se identificaron dos serotipos distintos y en otro tres. El número total de serotipos aislados fue de 21. Se concluye, que los perros de Nigéria podrian ser importantes como agentes transmisores de salmonelosis a humanos y otros animales domésticos.
Salmonelles Chez Les Chiens, A Vom, En Nigeria
Résumé L'examen par culture d'échantillons de matières fécales de 120 chiens domestiques de la région de Vom, en Nigéria, a montré que 22 d'entre eux, soit 18 p. 100, excrétaient des Salmonelles.Un des chiens hébergeait deux sérotypes et un autre trois sérotypes différents. Le nombre total des sérotypes isolés a été de 21. Les chiens peuvent donc constituer au Niger un facteur de transmission des Salmonelloses aux hommes et aux animaux domestiques.相似文献
8.
采用标志重捕法在海拉尔东山上捕捉达乌尔黄鼠,确定年龄(根据牙齿磨损程度)、性别、数量,编制静态生命表以推测种群发展动态.研究表明,该地区中Ⅰ龄鼠占66.7%、Ⅱ龄鼠占20%、Ⅲ龄鼠占13.3%,年龄结构呈金字塔型,属于增长型种群,群体雄雌比例为1∶1.14,接近1∶1,种群中雌性略大于雄性. 相似文献
9.
蒙药是蒙医师用于防治疾病的药物,是蒙医药事业发展的物质基础。蒙医药事业的可持续发展必须保障药材的质量和供应。随着蒙药资源使用量的增加和蕴藏量的减少,蒙药资源的可持续利用显得越来越重要。因此,一定要重视蒙药资源的可持续利用研究。文章着重介绍了蒙药资源可持续利用情况。 相似文献
10.
JH Waite GR Gladstone WS Lewis P Drossart TE Cravens AN Maurellis BH Mauk S Miller 《Science (New York, N.Y.)》1997,276(5309):104-108
Observations with the High Resolution Imager on the Rontgensatellit reveal x-ray emissions from Jupiter's equatorial latitudes. The observed emissions probably result from the precipitation of energetic (>300 kiloelectron volts per atomic mass unit) sulfur and oxygen ions out of Jupiter's inner radiation belt. Model calculations of the energy deposition by such heavy ion precipitation and of the resulting atmospheric heating rates indicate that this energy source can contribute to the high exospheric temperatures(>800 kelvin at 0.01 microbar) measured by the Galileo probe's Atmospheric Structure Instrument. Low-latitude energetic particle precipitation must therefore be considered, in addition to other proposed mechanisms such as gravity waves and soft electron precipitation, as an important source of heat for Jupiter's thermosphere. 相似文献