狸獭人工授精的试验研究

对１１只狸獭（Ｍｙｏｃａｓｔｏｒｃｏｙｐｕｓ）用按摩和电刺激相结合的方法人工采精３２只次，成功２７次，成功率８４．４％；射精量为（０．９７±０．１６）ｍＬ，精子密度（７．３４±１．４９）亿／ｍＬ，精子活力０．６５±０．１２，精子畸形率（８．８１±２．５１）％，精液ｐＨ值６．４４±０．１６。对诱排公狸施行输精管结扎术，先后给５只母狸人工输精，每只输精２～３次，在输精后４０～６０ｄ检查，４只受孕，其中有３只顺利产仔，产仔数分别为７只、７只、４只     

海狸鼠淋巴结的解剖及组织形态结构的初步研究

通过对健康成年海狸鼠淋巴结的初步研究发现 :海狸鼠的淋巴结被膜较薄 ,小梁不发达 ;淋巴小结数量较多 ,呈椭圆形 ,细胞排列密集 ,胞核染色较深 ,生发中心不明显 ,皮窦和髓窦相对发达。     

海狸鼠消化管显微及亚显微结构

应用光镜、电镜和组织化学技术,对 １０ 只成年海狸鼠消化管的食管、胃底、小肠和大肠壁的显微和亚显微结构进行了研究。结果显示,在 Ｈ Ｅ 染色,海狸鼠食管粘膜上皮细胞角化程度较高,胃底腺壁细胞的数量几乎与主细胞的相等或稍多,小肠肠腺底部含有大量潘氏细胞; Ｓｃｈｉｆｆ 氏染色,胃粘膜的上皮细胞、胃底腺的颈粘液细胞、十二指肠腺的粘液细胞、肠腺的潘氏细胞和杯状细胞均为阳性; Ｍ ａｓｓｏｎｆｏｎｔａｎａ 氨银法染色,在胃底腺和肠腺内均见有银亲合细胞。扫描电镜下,胃粘膜表面见有较多胃小凹,小肠上皮细胞的微绒毛形成许多指状突起。透射电镜观察,胃底部壁细胞中线粒体、滑面内质网、细胞内小管发达,小肠上皮细胞的微绒毛密集排列,细胞间见有连接复合体结构,胃底腺和肠腺内见有散在分布的内分泌细胞。     

Health status of a population of nutria (Myocastor coypus) living in a protected area in Italy

Ninety trapped nutria (Myocastor coypus) from a protected area of Piedmont (Italy), including the Po river, were examined for the prevalence for lesions in major viscera, selected serum antibodies and enteric bacteria. Coccidial lesions in the liver included cholangitis, calcification and necrosis. Renal lesions were nonsuppurative interstitial nephritis and a single case of renal adenocarcinoma. The lungs had a 41.1% prevalence of nonsuppurative interstitial pneumonia. Ten of 87 sera (11.5%) had antibodies against Leptospira bratislava, 3 of 87 (3.4%) against Leptospira ichterohaemorrhagiae, 15 of 41 (36.6%) against Toxoplasma gondii, and antibodies against encephalomyocarditis virus were detected in 5 of 78 sera (6.4%). All fecal samples were negative for Salmonella, Shigella, and Pseudomonas, and growth of enterobacteriaceae was in the normal range.     

狸獭染色体核型研究初报

采用秋水仙素—低渗—空气干燥法制作了狸獭的染色体标本,并对其染色体核型进行了初步的分析研究。结果表明,狸獭染色体除Ｙ为端着丝粒染色体外,其余均为中部或亚中部着丝粒染色体,２ｎ＝４２,无随体存在。     

海狸鼠尾部肌腱的解剖及组织学研究

为探讨海狸鼠尾部肌腱的潜在应用价值，对10只成年海狸鼠进行了解剖学研究，发现海狸鼠的尾部肌腱非常发达，共有108根肌腱，它们分为4束，分别分布在尾部的背面和腹面两侧。肌腱的长度不一，最长者可达40cm；肌腱的细度均匀，横径在0.2-0.69mm。肌腱主要由胶原纤维组成，占纤维总量的43.45%，其化学成分95%以上是胶原蛋白。     

海狸鼠躯干部骨骼的解剖特点

海狸鼠(Myocastor coypus)的躯干骨由脊柱、肋骨和胸骨三部分构成。脊柱包括颈椎、胸椎、腰椎、荐椎和尾椎。其中,颈椎7个,胸椎13个,腰椎6个,荐椎4个,尾椎26个。     

Fasciola hepatica infections in livestock flock, guanacos and coypus in two wildlife reserves in Argentina

Between autumn and spring 2006, a coprological survey was performed in two wildlife reserves located in the north of Argentine Patagonia to determine the prevalence of Fasciola hepatica and the number of parasite eggs per gram (epg) of feces in wild guanacos (Lama guanicoe), coypus (Myocastor coypus), and locally born and raised goats and sheep. Snails of the Family Lymnaeidae were collected in freshwater habitats, identified taxonomically and analyzed parasitologically.Prevalence of patent infection was 100% in sheep (n = 69) and coypus (n = 9), 84% in goats (n = 20) and 0.5% in guanacos (n = 224). No significant differences in epg were found among animals, but the median epg of coypus (160) and sheep (160) was higher than that of goats (80). For guanacos and goats, a negative binomial model estimating the population egg-count frequency could be fitted, while for coypus and sheep parasite egg-count frequencies trended toward a normal distribution, indicative of a more even, and much less aggregated distribution across sampled hosts. All snails (n = 175) were Lymnaea truncatula and none of them was found infected. This is the first report of fascioliasis in free-ranging guanacos in Argentina. Coypu appears to be a major wildlife reservoir of F. hepatica, which was presumably introduced locally by livestock.     

家养海狸鼠人工采精技术初探

本试验在人工保定的情况下，对家养的性成熟海狸鼠，１９９３．６—１９９３．７月间环境温度１０—２０℃条件下，通过按摩和电刺激相结合进行采精获得成功。射精电压为３伏或６伏，精液量１毫升，精子活率０．５１，密度６亿／毫升，ＰＨ６．４。