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080611 - Anestesia en Coypus (Myocastor coypus) - Anesthesia in cCoypus (Myocastor coypus)
J. Echeverría
REDVET , 2006,
Abstract: En la actualidad, la captura e inmovilización de los animales se ha convertido en una herramienta de suma importancia no sólo para el traslado de animales, sino también para ciertos estudios etológicos y ecológicos. El objetivo del presente estudio fue determinar dosis sedantes y anestésicas de una combinación de ketamina/xilazina y estudiar bajas y altas dosis de una combinación de acepromacina/ketamina para ser empleadas correctamente en técnicas de captura e inmovilización en coypus (Myocastor coypus). Se han elegido puntualmente el maleato de acepromacina, el clorhidrato de Ketamina y el clorhidrato de xilacina por ser estas las tres más corrientemente empleadas en la clínica tanto de peque os como de grandes animales, además de ser las de uso corriente para técnicas de sujeción y/o manejo de animales silvestres (Young, 1975; Szabuniewicz y col., 1977-78; Jalanka & Roeken, 1990; Bo y col., 1994; Deem, 2002). Existen varios estudios que mencionan diferentes protocolos anestésicos para el Myocastor coypus, tanto en cautiverio como en libertad, pero existen sólo unos pocos datos publicados que aborden profundamente el dise o de estos protocolos (Jalanca & Roeken, 1990). The safe capture and immobilization of animals has become an exceedingly important scientific tool. It is used not only for transportation, but also for performing in certain ethological and ecological studies. The objective of the present work is toknow the degree of potencia and doses in coypus (Myocastor coypus) of some tranquilizers and anesthesics drugs usually employed in veterinary practice. El objetivo del presente estudio fue determinar dosis sedantes y anestésicas de una combinación de ketamina/xilazina y bajas y altas dosis de una combinación de acepromacina/ketamina para ser empleadas correctamente en técnicas de captura e inmovilización en coypus (Myocastor coypus). The aim of the present study was to determine sedative and anesthestic doses of a combination ketamine/xylazine and to study low and high doses of a combination acepromacine/ketamine to be used for proper capture and immobilization of coypus (Myocastor coypus). Acepromacine maleate, Ketamine chlorhidrate, and xylazine chlorhidrate have been punctually selected since are the most commonly used in clinic practice of domestic animals, as well as for the capture and care of wildlife (Young, 1975; Szabuniewicz y col., 1977-78; Jalanka & Roeken, 1990; Bo y col., 1994; Deem, 2002). There are some studies that mention different protocols of anesthesia in Myocastor coypus, both in cautivity and in freedom, but there are
MORPHOLOGICAL STUDY OF THE VAGINA OF THE Myocastor coypus (COYPU)
Felipe,Antonio E.; Castro,Alejandra; Callejas,Santiago S.; Cabodevila,Jorge A.;
Revista chilena de anatomía , 2000, DOI: 10.4067/S0716-98682000000200003
Abstract: the myocastor coypus (coypu) is a medium size rodent internationally considered as a species of economic interest because its fur. the aims of this work was realized the morphological study of the vagina of coypu. the vagina of sexually mature coypus appeared as a tubular organ, 10.25±1.40 cm long. the vaginal wall was very thin. it was composed by four layers: mucosa, submucosa, muscularis, and adventitia or serosa (according to the region). the lining epithelium of the mucosa was squamous stratified and without glands. two layers of smooth muscular tissue with abundance of connective tissue were differentiated in the muscularis. the tunica serosa, formed by connective tissue of dense aspect, had numerous big blood vessels
DESCRIPTION OF THE CHARACTERISTICS OF OOCYTES AND ZYGOTES OF COYPU (Myocastor coypus
Felipe,Antonio; Teruel,Miriam; Callejas,Santiago; Cabodevila,Jorge;
Revista chilena de anatomía , 2001, DOI: 10.4067/S0716-98682001000200007
Abstract: the goal of the present work was to characterise morphologically the oocytes and zygotes of myocastor coypus. in order to obtain the samples, a daily colpocytological follow-up and programmed mating of females were done. by flushing of the oviducts, oocytes (17) and zygotes (24) were collected. in the analysis of the oocytes and zygotes, morphological aspects, including analysis of cellular polarity and of the envelopments were considered. oocytes presented spherical shape with a cellular diameter of 85.7 ± 3.1 μm. the nucleus presented a diameter of 28 ± 3.1 μm. the occupied perivitelline space was 98%, with a zona pellucida thickness of 15.9 ± 1.9 μm. the existence of ovular polarity was determined. zygotes presented an external diameter, measured to the zona pellucida, of 125 ± 8.6 mm and an embryonic diameter of 80.6 ± 8.1 μm. in 91.7% of the cases, they were in the stage of 2-nucleus zygote. a homogenous distribution of cytoplasmic granulations was observed in all the zygotes. as the only and complete envelopment, zygotes presented the zona pellucida, obtaining few specimens with associated granulose cells
MORPHOLOGICAL STUDY OF THE VAGINA OF THE Myocastor coypus (COYPU) ESTUDIO MORFOLOGICO DE LA VAGINA DE Myocastor coypus (COIPO)  [cached]
Antonio E. Felipe,Alejandra Castro,Santiago S. Callejas,Jorge A. Cabodevila
Revista chilena de anatomía , 2000,
Abstract: The Myocastor coypus (coypu) is a medium size rodent internationally considered as a species of economic interest because its fur. The aims of this work was realized the morphological study of the vagina of coypu. The vagina of sexually mature coypus appeared as a tubular organ, 10.25±1.40 cm long. The vaginal wall was very thin. It was composed by four layers: mucosa, submucosa, muscularis, and adventitia or serosa (according to the region). The lining epithelium of the mucosa was squamous stratified and without glands. Two layers of smooth muscular tissue with abundance of connective tissue were differentiated in the muscularis. The tunica serosa, formed by connective tissue of dense aspect, had numerous big blood vessels Myocastor coypus es un roedor de tama o mediano, considerado internacionalmente como una especie de interés económico por sus cualidades peleteras. El estudio morfológico de su vagina reviste importancia en el marco de investigaciones de su fisiología reproductiva. La vagina de coipos sexualmente maduros se presentó como un órgano tubular, de 10,25 ± 1,40 cm de longitud. La pared vaginal fue muy delgada, distinguiéndose en ella cuatro túnicas: mucosa, submucosa, muscular y adventicia o serosa (según la región). Su epitelio de revestimiento era de tipo escamoso estratificado y aglandular. En la túnica muscular se diferenciaron dos capas de tejido muscular liso con abundancia de tejido conectivo. La serosa, conformada por tejido conectivo de aspecto denso, presentó numerosos y grandes vasos sanguíneos
GnRH NEURONES POPULATION IN THE DIENCEPHALON OF THE COYPU (Myocastor coypus)
Silva,L; Sánchez,H; Acosta,W; Portiansky,E; Zuccolilli,G;
Revista chilena de anatomía , 2000, DOI: 10.4067/S0716-98682000000100001
Abstract: the goal of this study was to investigate the distribution and morphology of neurones that synthesise and store gonadotrophin releasing factor (gnrh) in the diencephalon of the coypu (myocastor coypus), a south american rodent of the hystricomorpha suborder. for this purpose the encephalon of three mature male coypus were fixed by intra-arterial perfusion, using a paraformaldehyde and picric acid solution. the hypothalamic blocks were cut with freezing microtome to obtain 40μm thick coronal sections. the slides were exposed to an ultrasound antigen retrieval process in order to unmask hidden antigens. these sections were then processed using an immunohistochemical technique to show the gnrh neurones, using a monoclonal antibody (lrh 13). one group of serial sections was stained with cresyl violet (nissl techniques) while the other sections were stained using küver barrera's method (luxol fast blue and cresyl violet), to show the nuclei and nervous tracts of the hypothalamus under microscopic observation. morphometric and quantitative analysis of neuronal bodies were performed using an image analyser. gnrh immunoreactive neurones were bipolar and long. the total number of neuronal bodies for this species was estimated at 1072 ± 27. all the cells were located in the rostral hypothalamus, mainly in the preoptic area. a few neurones were also observed in the bed nucleus of the stria terminalis and hypothalamic preoptic medial nucleus. the immunoreactive fibres were observed in the external layer of the median eminence. according to the data obtained we inferred that the distribution of the gnrh neurones of the coypu mainly coincides with that of other rodents such as the rat.
Topography of the medullar cone in nutria (Myocastor coypus Molina, 1782 – Rodentia: Mammalia)
Gilberto Valente Machado,Josy Alvarenga Cal,Arlei José Birck
Biotemas , 2009,
Abstract: Aiming to investigate the topography of the medullar cone, ten adult nutria (Myocastor coypus), eight male and two female, were previously fixed in 10% aqueous formalin solution, maintained in similar solution and dissected. After the dissection the following data were noted: a) the medullar cone apex was close to the fifth lumbar vertebra (L5) in five animals (50.0%), between L5 and L6 in three animals (30.0%), between L4 and L5 in one animal (10.0%), and just above L6 in one animal (10.0%); b) the medullar cone base was observed between L3 and L5 in nine animals (90.0%), and in one animal alone (10.0%) it was found between the L4 and L5 vertebrae. This Myocastor coypus presented six lumbar vertebrae.
Pattern of division and distribution of the mesenteric arteries in nutria (Myocastor coypus – Rodentia: Mammalia)
Gilberto Valente Machado,Pedro Renato Gon?alves,Adelvino Parizzi,Juliana Rosa de Souza
Biotemas , 2006,
Abstract: For the recognition of the anatomical pattern of the mesenteric arteries, ten adults nutria (Myocastor coypus), males and females, were dissected, and the following results were obtained: a) The cranial mesenteric artery appears from the ventral face of the abdominal aorta, close to the celiac artery (70%), or as a common trunk with it (30%). b) The direct branches of the cranial mesenteric artery are the caudal pancreaticoduodenal (100%), middle colic (100%), duodenojejunal (90%), pancreatic (10%), hepatic (10%), right colic (100%), jejunal (100%), ileocolic (100%) and ileal (100%) arteries. The caudal mesenteric artery appears from the ventral face of the abdominal aorta, immediately cranial to the emergence of the external iliac arteries, and it separates to form the cranial rectal and left colic arteries. This left colic artery can be anastomosed (30%), along the wall of the descending colon, with the descending branch of the middle colic artery.
Proposal of a method to estimate the weight of dried eye lens in the Coypu (Myocastor coypus) / Proposta di un metodo per la stima del peso secco del cristallino nella Nutria (Myocastor coypus)
Massimo Cossignani,Francesco Velatta
Hystrix : the Italian Journal of Mammalogy , 1993, DOI: 10.4404/hystrix-4.2-3990
Abstract: A method is proposed to estimate the average weight of dried eye lens of Myocastor coypus from morphometric parameters that can be detected also in living. Riassunto Viene proposto un metodo per stimare il peso secco medio dei cristallini di Myocastor coypus a partire da parametri morfometrici rilevabili anche sugli animali vivi.
Prevalence of Toxoplasma gondii infection in Myocastor coypus in a protected Italian wetland
Simona Nardoni, Maria C Angelici, Linda Mugnaini, Francesca Mancianti
Parasites & Vectors , 2011, DOI: 10.1186/1756-3305-4-240
Abstract: The occurrence of the infection was evaluated using a modified agglutination test (MAT) in 74 adult coypus from a naturalized population living in a wetland of Central Italy. Nested PCR (n-PCR) assay was carried out on some of them. Positive T. gondii MAT results were found in 44 animals (59·4%), 30 males (68·2%) and 14 females (31·8%). Antibody titers were ranging from 20 to 40960, while 12 out of 23 (52·2%), examined animals, 8 males (66·7%) and 4 females (33·3%), resulted positive to n-PCR. All n-PCR positive animals were seropositive, showing antibody titers ranging from 640 to 40960.Our results indicate that examined animals are heavily parasitized with Toxoplasma. This suggests that coypus could be a reservoir of this parasite, because they can be eaten both by scavenger animals and by humans, and that these animals would play a role in maintaining the cycle of T. gondii.Toxoplasma gondii is an obligatory intracellular protozoan parasite which can infect all warm-blooded animals and is the aetiological agent of toxoplasmosis, a major zoonosis. T. gondii has adapted to an oocyst-oral cycle in herbivores [1,2]. Felines are known to act as definitive hosts and they can shed millions of oocysts in the environment. After a period they sporulate and become highly infectious and resistant to environmental influences, being able to maintain their infectivity in moist soil as well as on fruits and vegetables for long periods [3,4]. Mechanical spread of oocysts by flies, cockroaches, dung beetles and earthworms represents an additional route of infection [1]. The role of filter feeder mussels as casual reservoir has also been established [5,6].Coypus (Myocastor coypus), commonly nutria, are large semi-aquatic invasive rodents, naturalized throughout European countries, including most wetlands of Italy. Coypu is ecologically associated with people due to changes in the ecosystem caused by human activities. It adapts to a wide variety of environmental conditions and persi
MORPHOLOGICAL STUDY OF THE FEMALE EXTERNAL GENITALIA OF THE MYOCASTOR COYPUS (COYPU)
Felipe,Antonio E.; Castro,Alejandra; Callejas,Santiago S.; Cabodevila,Jorge A.;
Revista chilena de anatomía , 2001, DOI: 10.4067/S0716-98682001000100003
Abstract: the aims of this work was realised the morphological study of the female external genitalia of myocastor coypus. the vulva was rudimentary and limited by two folds scarcely developed. its external surface showed a cover with scarce and long hairs while the internal surface had a hairy cover and no pigmentation. the lining of the vulvar area showed a squamous stratified epithelium resting on a lamina propria with many microscopic papillae. in the lamina propria there were abundant small glands of sebaceous aspect associated to pilose follicles of small diameter. the clitoris was a prominent conic structure, with a small glans covered by the prepuce of the clitoris. the prepuce, of rugose surface and soft and flexible consistency, projected point-first towards ventral. the clitoris had a well-developed cavernous body (corpus cavernosum), with muscular tissue in the basal zone, formed the body of the clitoris. the axial part of the body had an elongated hyaline cartilaginous nucleus. the urethral opening was observed as a longitudinal fissure at dorsal of the clitoris, behind the glans
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