RESUMEN
An epulis in the oral cavity of an aged captive lion in Brasilia, Brazil, is reported. Oral inspection of the animal revealed a pale blunt and irregular multilobulated mass involving the upper left caninum tooth. Microscopic features of the mass included a fibrous stroma (mesenchyme) interspaced with a few blood vessels, suggesting a periodontal ligament origin. The dense collagen fiber background had a moderate cellularity composed of regularly orientated fibroblasts and it surrounded foci of osteoid or mineralized material. Mild overlying gingival epithelial hyperplasia with some irregular cellular cords was also observed. Based on the location of the lesion as well as the gross and microscopic features, the lesion was classified as fibromatous epulis and is believed to be the first report in this species.(AU)
Asunto(s)
Animales , Neoplasias Gingivales/congénito , Fibroma/veterinaria , Enfermedades de las Encías/diagnóstico , Leones/fisiología , Brasil , BocaRESUMEN
Twenty-seven healthy captive lions (Panthera leo) and 13 healthy captive tigers (Panthera tigris) from São Paulo Zoo (Fundação Parque Zoológico de Sã Paulo, São Paulo, Brazil) collection were selected for this study. They were anesthetized with ketamine (10 mg/kg) combined with xylazine (1-2 mg/kg) for physical examinations, hematologic and serum chemical analysis and electrocardiogram recording. The main aim of this research was to gather initial information about normal electrocardiographic parameters of large felids. Standard P-QRS-T deflections on leads described for domestic carnivores were analyzed, and they did not greatly differ from those of large felids, taking into account the greater weight and corporal mass of large felids. Heart rate of lions ranged from 42 to 76 beats per minute (bpm). Heart rate of tigers ranged from 56 to 97 bpm. In both species, the most common rhythm detected was normal sinus rhythm followed by sinus arrhythmia; wandering pacemaker was also observed with normal sinus rhythm or sinus arrhythmia. Mean electrical axis lay between +60 degrees and +120 degrees. QRS complexes were predominantly positive in leads DI, DII, DIII, and AVF, and negative in AVR and AVL. This study provides insights into normal electrocardiograms of large felids. Wider investigations on the same subject are necessary to establish criteria for the recognition of abnormalities in these species and should include other anesthetic drug(s) combinations and reports of electrocardiographic features of animals with cardiac disease and electrolytes disturbances.
Asunto(s)
Anestésicos Disociativos/administración & dosificación , Electrocardiografía/veterinaria , Frecuencia Cardíaca/fisiología , Leones/fisiología , Tigres/fisiología , Agonistas alfa-Adrenérgicos/administración & dosificación , Animales , Animales de Zoológico , Peso Corporal/fisiología , Femenino , Inmovilización/métodos , Inmovilización/veterinaria , Ketamina/administración & dosificación , Masculino , Valores de Referencia , Especificidad de la Especie , Xilazina/administración & dosificaciónRESUMEN
The intrinsic yield of spermatogenesis and the supporting indexes of the Sertoli cells are the best indicators for the spermatic production capacity in a species. The aim of the present study was to quantify the intrinsic yield of the spermatogenetic process, as well as the Sertoli cell index and spermatic reserves. Testicular fragments of five adult African lions was fixed in 4% glutaric aldehyde, dehydrated at increasing alcohol concentrations, included into hydroxyethyl methacrylate, and were cut into 4 microm thickness. In the seminiferous epithelium of the African lions, 10.3 primary spermatocytes at pre-leptotene phase are produced by the type-A spermatogonia. During meiotic divisions, only 2.7 spermatids were produced from the primary spermatocytes. The general spermatogenesis production in the African lions was approximately 22.1 cells, and each Sertoli cell was able to sustain and maintain approximately 14.9 cells of the germinative line, from which 7.9 are round spermatids. A total of 103x10(6) spermatozoa are produced by each testis gram at each cycle of the seminiferous epithelium. The spermatic reserve of lion is below the amplitude observed in mammals.
Asunto(s)
Animales de Zoológico/fisiología , Leones/fisiología , Células de Sertoli/fisiología , Recuento de Espermatozoides , Espermatogénesis/fisiología , Animales , Masculino , Epitelio Seminífero/citología , Espermátides/citología , Espermatocitos/citología , Espermatogonias/citología , Testículo/citologíaRESUMEN
This study describes a strong aponeurosis on the caudal surface of the antebrachium, between the Mm. Flexoris and the M. pronator quadratus. This aponeurosis has not been experimentally validated. By dissection and macroscopic examination of formaldehyde-prepared material, and experimental surgical transection of the structure in F. catus, the aponeurosis is described and its functional capacity is determined. The origin of the aponeurosis is the Facies caudalis, Margo medialis of the Radius and distal Ulna and inserts on the Crista transversa of the Radius and the Ligg. radiocarpeum palmare and ulno-carpeum palmare, and a strong Pars radialis. Its disposition is similar to that of the supernumerary M. anterior radialis brevis in humans. Surgical transection of the aponeurosis in F. catus resulted in hyperextension of the Manus and a decrease in the Carpus in its weight-bearing ability. These findings indicate the anatomico-functional importance of the aponeurosis in providing support to the claws.