Investigation of Cervical Patency and Uterine Appearance in Domestic Cats by Fluoroscopy and Scintigraphy     

K Chatdarong  N Kampa  E Axnr  C Linde‐Forsberg 《Reproduction in domestic animals》2002,37(5):275-281

The cervical patency of six domestic female cats was monitored under sedation by infusion of contrast medium (Omnipaque) into the cranial vagina during early oestrus, mid‐oestrus, late oestrus and interoestrus or a radiopharmaceutical (^99mTc‐HSA) during mid‐ and interoestrus in a non‐ovulatory oestrous cycle. The transport of the contrast medium or the radiopharmaceutical through the cervix and within the uterine horns was observed under fluoroscopy and with the aid of scintigraphy. In three of the queens, transcervical transport of contrast medium was demonstrated in all stages of oestrus, in one queen during mid‐oestrus, late oestrus and 1 day after oestrus, and in two queens only during late oestrus. The relations between the cervical patency to the contrast medium and the oestrous behaviour, cornification of the vaginal cells and the serum oestradiol‐17β concentration were evaluated, and a relationship was found between the cervical patency and the degree of vaginal cornification. Transcervical transport of the radiopharmaceutical was observed in three queens during mid‐oestrus. When the cervix was open, hysterography under a fluoroscope and hysteroscintigraphy were performed. The fluoroscopic and scintigraphic recordings revealed the patterns of the uterine contractions during oestrus in both ascending and descending directions, and the movement of the uterine contents back and forth between the uterine horns. The hysterograms were classified according to the shape of the uterine horns and the appearance of the endometrial lining. Spiral‐shaped uterine horns with a smooth inner contour were observed in two queens, and a corkscrew appearance with irregular filling defects in the uterine lumen was shown in two queens that had developed subclinical cystic endometrial hyperplasia. These findings demonstrated that fluids or particles deposited in the cranial vagina of the cat can be transported into the uterus during some stages of the oestrous cycle. The fluoroscopic and scintigraphic techniques developed in this study may be further modified to permit more detailed studies of uterine contractile patterns and sperm transport in the feline female reproductive tract. Hysterography proved useful to diagnose uterine disease. The information on cervical patency is of value also for the development of techniques for artificial insemination in this species, and should be studied also in the ovulatory cycle.  相似文献   

面对WTO谈成都蚕业的发展出路     

干群  余惠岚 《蚕学通讯》2002,22(1):34-36

面对WTO，蚕业必须深化改革，加快体制改革和技术创新，从调整结构、区域化布局，探索桑地流转机制，扩大生产规模，加强生产基础，扶持龙头企业，扶持产业化，提质上档，提升蚕业内在竞争力，应对“入世”。成都蚕业的发展必须要顺应形势和战略转变，这既是蚕业生产今后的指导思想和发展方向，又是进一步地发展和振兴成都蚕业的战略重点和工作重点。本就成都蚕业发展历程、产业化现状、制约因素、发展方向、对策措施等提出一些粗浅的认识。  相似文献   

几种绢丝昆虫遗传多样性的RAPD研究   总被引：10，自引：4，他引：6  

程道军  鲁成  周泽扬  向仲怀 《蚕业科学》2002,28(4):277-282

选用重复性较好的 10个引物对 6种绢丝昆虫 2 3个个体进行扩增 ,共得到 2 45个RAPD标记。RAPD分析结果表明 :家蚕及野桑蚕种内各品种材料的遗传距离较大 ,天蚕、蓖麻蚕及柞蚕较小 ;家蚕与野桑蚕两者之间遗传距离小 ,反映出家蚕和野桑蚕亲缘关系较近 ;而天蚕、蓖麻蚕和柞蚕三者之间以及分别与家蚕和野桑蚕之间的遗传距离较大 ,亲缘关系远。聚类分析的结果与之相同。并且对家蚕的起源及绢丝昆虫遗传多样性的保护利用做了探讨。  相似文献   

灭火作战中火场紧急避险“六要素”   总被引：1，自引：0，他引：1  

周昌荣 《森林防火》2006,(4):34-35

针对灭火作战中火场紧急避险,提出了注重科学指挥;加强日常避险训练习;抓好火场紧急避险常识教育;加强火场紧急避险理论研究工作;灭火作战任务与安全避险统筹兼顾;熟悉战法灵活避险六点看法。  相似文献   

双黄杀毒退烧颗粒对畜禽免疫功能的影响     

程江  岳华  谢青  彭莉  刘群  岳秀英  高岚  武健华 《中国兽药杂志》2005,39(12):23-24,35

研究了纯中药复方抗病毒制剂--双黄杀毒退烧颗粒对成年兔、鸡的体液免疫及细胞免疫功能的影响.HI抗体检测、MTT实验、E-玫瑰花环形成试验和酯酶染色试验的结果表明,双黄杀毒退烧颗粒能显著增强家兔的体液免疫作用,明显提高家兔和鸡的细胞免疫功能,对家兔的免疫增强作用优于鸡.  相似文献   

基于Matlab的时序数据两种建模和预测方法比较     

孟娜  周以齐 《山东农业大学学报(自然科学版)》2006,37(3):471-476

利用Matlab工具箱,对时序数据进行了两种不同形式的建模和预测。一是利用系统辨识方法来建立AR模型,利用所建模型进行预测；二是利用单隐层BP神经网络,对数据进行非线性拟合和预测。通过可视化,比较了两种方法的优劣。  相似文献   

南、北盘江流域（贵州部分）土地退化类型及机理   总被引：1，自引：0，他引：1  

周家维 《贵州林业科技》2005,33(4):6-10

在对珠江上游南、北盘江流域（贵州部分）调查的基础上，分析了该流域土地退化成因，原生生态系统的脆弱性只是导致土地退化的一个方面。而人为活动才是土地退化的主要因素。根据土地退化的成因、结果，将珠江上游南、北盘江流域（贵州部分）土地退化划分为：土壤侵蚀、石漠化、土地贫瘠、土壤污染、土壤破坏五种类型，并提出了退化土地的管理及恢复措施。  相似文献   

湖南省滑胸茧蜂属Homolobus Foerster初报(膜翅目:茧蜂科:滑胸茧蜂亚科)     

游兰韶  周至宏  童新旺 《湖南农业大学学报(自然科学版)》1990,(4)

描记滑胸茧蜂属属征和褐滑胸茧蜂形态,并提供该蜂的形态图。  相似文献   

Reproductive roles predict sexual dimorphism in internal and external morphology of lake whitefish,Coregonus clupeaformis     

S. J. Casselman  A. I. Schulte‐Hostedde 《Ecology of Freshwater Fish》2004,13(3):217-222

Abstract – The different reproductive roles of the sexes can predict the direction and magnitude of sexual dimorphism of external and internal morphology. Males should have enlarged structures that enhance the acquisition of mating opportunities, whereas females are predicted to have enlarged organs that are associated with the production of eggs. We tested these predictions in male and female lake whitefish, a species in which both sexes have similar overall body size and shape. After controlling for body size, male lake whitefish had significantly longer jaws and pectoral and pelvic fins, larger hearts, and more muscle than females. Sexual dimorphism in relative muscle mass may be one of the most fundamental morphological differences between males and females. Females had relatively heavier livers than males. Because the liver is important for the breakdown of fats and vitellogenesis, selection should favour an enlarged liver in females for the processing of energy and the production of large numbers of eggs.  相似文献   

C_R704玉米与S_C704玉米过氧化物酶同工酶及生理指标分析     

刘双俊  兰庭瑶  柯贤波  马立群  王主选 《新疆农业大学学报》1990,(1)

C_R704玉米与S_C704玉米各时期的过氧化物酶同功酶谱无明显差别,二者遗传基础一致,但酶活性C_R704玉米高于S_C704玉米。经测定三系杂种C_R704玉米在叶绿素、糖、淀粉及蛋白质含量均优于单交种S_C704玉米。  相似文献