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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

An analysis of acoustic communication in the chinchilla

Vogt, Susan Carol. January 1980 (has links)
Thesis (M.S.)--University of Wisconsin--Madison, 1980. / Typescript. Title from title screen (viewed Mar. 19, 2007). Includes bibliographical references (leaves 135-140). Online version of the print original.
2

An analysis of acoustic communication in the chinchilla

Vogt, Susan Carol. January 1980 (has links)
Thesis (M.S.)--University of Wisconsin--Madison, 1980. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 135-140).
3

Carbohydrate digestion in the chinchilla

Smith, Diana Claire January 1970 (has links)
Carbohydrase activity in the chinchilla (Chinchilla lanigera) was investigated from birth to post-weaning. Crude homogenates of the small intestinal wall and pancreas were prepared in order to study intestinal lactase, maltase and sucrase, and pancreatic amylase. The study was based on the assumption that, at different stages of growth, the carbohydrase levels reflect the ability of the animal to utilize specific carbohydrates. Small intestinal lactase activity was highest from birth to three weeks of age, at which time it decreased sharply reaching the fairly constant low levels found in the post-weaned animal by four weeks. Maltase activity at birth was appreciable, increasing significantly at four weeks of age and attaining maximum levels by twelve weeks of age. The adult animal retained this high activity. In contrast to maltase, sucrase activity was negligible at birth and did not increase significantly until five weeks of age, at which time a steady increase was noted to the adult levels attained by the twelve week old animal. Pancreatic amylase was similarly negligible at birth. The highest increase in activity occurred between three and eight weeks at a time when intestinal lactase activity was decreasing. This also corresponded to the time of most rapid increase in maltase activity. The digestion of more complex carbohydrates was also investigated in the adult chinchilla. Cellulose, comprising 18.7% of a pelleted ration, was 54% digestible, the main sites of cellulose breakdown being the cecum and large intestine. Total volatile fatty acids (VFA) throughout the alimentary tract of animals on a normal ranch ration of pellets and hay were quantitated, as were the individual acids. The cecum and large intestine were the only sites of VFA production, while the low levels found in the stomach were attributed to coprophagy. / Land and Food Systems, Faculty of / Graduate
4

Contribution radiologique et ostéologique à la connaissance du Chinchilla (Chinchilla lanigera) /

Gasse, Coline Ducos de Lahitte, Jacques January 2008 (has links) (PDF)
Reproduction de : Thèse d'exercice : Médecine vétérinaire : Toulouse 3 : 2008. / Titre provenant de l'écran titre. Bibliogr. p. 133-136.
5

Efectos de la domesticación de la chinchilla chilena, Chinchilla lanigera, sobre algunos indicadores morfológicos y genéticos

Pérez Concha, Patricia January 2004 (has links)
Memoria para optar al Titulo Profesional de Médico Veterinario / Se analizaron los efectos producidos por la domesticación en Chinchilla lanigera comparando individuos de criadero con individuos silvestres con el objeto de analizar el efecto de la domesticación sobre este roedor. Se midieron diez variables corporales y craneanas de las cuales tres discriminaron diferencias entre grupos mediante análisis de componentes principales, éstas fueron: largo total del cráneo, largo basal del cráneo y ancho máximo craneal. La separación morfológica no fue evidente para las variables comúnmente indicadoras del proceso domesticación sugiriendo que este no estaría totalmente establecido en el grupo de chinchillas de criadero a nivel fenotípico. Para el caso del análisis molecular se observó una diferencia de 2,4% en sus secuencias genéticas entre las chinchillas silvestres de sectores de Aucó, Cuyano y Curico y las chinchillas domésticas determinando que se clasifiquen como poblaciones distintas. Para el caso de un individuo silvestre del sector de la Higuera, éste presente un mayor parentesco con las domésticas confirmando la teoría de que las chinchillas domésticas que se exportaron a USA para la industria peletera provienen de este lugar
6

Efectos de la administración subcutánea de zeranol sobre la morfología testicular de chinchillas (Chinchilla lanígera) de uso comercial

Santibáñez Araya, Carolina Andrea January 2014 (has links)
Memoria para optar al título Profesional de Médico Veterinario / Zeranol es un producto semi-sintético no esteroidal con potencial actividad estrogénica, que ha sido usado por criadores de la industria peletera de chinchillas para obtener pieles de mejor calidad. Estudios realizados en ratas evidencian efectos deletéreos del Zeranol a nivel testicular, sin embargo, en chinchillas no existen estudios que demuestren los efectos de este anabólico a nivel de la morfología testicular. El presente estudio pretende realizar una evaluación de los efectos del Zeranol a nivel testicular de machos Chinchillas. Se implantaron veintisiete machos adultos con una dosis total de 6 mg de Zeranol y 9 individuos no tratados conformaron el grupo control, ambos grupos en iguales condiciones de manejo. Los animales fueron eutanasiados y se recuperaron los testículos, a los que se les realizó medicina de peso, largo y circunferencia testicular. Asimismo, los testículos se procesaron para evaluación histológica de rutina. Los resultados evidenciaron diferencias significativas en cuanto a las variables macroscópicas y microscópicas testiculares. Los individuos del grupo tratado presentaron una significativa reducción en el peso, largo, ancho y circunferencia testicular, además de disminución del lumen tubular de los túbulos seminíferos, pérdida de la estructura del epitelio seminífero y túbulos desprovistos de espermatozoides. Los resultados anteriores sugieren que Zeranol produce un efecto tóxico a nivel testicular incluyendo un daño degenerativo en células germinales y células de Leydig, afectando así la espermatogénesis. / Proyecto FIV 2012, N°12101401.9102.013
7

Observations on the gross and histological morphology of the chinchilla kidney

Wright, David Victor, 1945- January 1969 (has links)
No description available.
8

An electrophysiological study of binaural interaction in the chinchilla auditory cortex

Benson, Dennis Alan, January 1973 (has links)
Thesis--University of Florida. / Description based on print version record. Typescript. Vita. Bibliography: leaves 162-172.
9

Physiology of the exocrine pancreas in relation to protein utilization by the chinchilla

Smith, Valerie Irene January 1973 (has links)
Protein utilization was investigated in the chinchilla from birth to post-weaning by studying three important stages of growth and nutritional adaptation, occurring at birth, weaning, and in adult life. The first area of study was centered on the pre-colostral chinchilla, a period which in many species is accompanied by absorption of intact proteins and immunoglobulins. immunoglobulins of the blood sera from birth to post-weaning were quantitated by polyacrylamide disc gel electrophoresis. The levels of immunoglobulins did not correlate with pancreatic enzyme or inhibitory levels in any way so as to show a relationship between inhibited enzyme levels and the amount of immunoglobulin absorbed into the blood stream. Trypsin and chymotrypsin inhibitors, assayed spectrophotometri cally, were not appreciable in the pancreatic homogenate from the young chinchilla tested. The study of adaptation can be based on the assumption that at different stages of growth, the chinchilla utilizes the proteins of its diet to different extents. This is in accordance with the change in level of protein between its first diet of maternal milk and then its secondary diet of roughage. in order to verify this assumption, pancreatic protease activity, of trypsin and chymotrypsin, was studied in seventeen chinchilla from birth to post-weaning. Homogenates of the pancreas, assayed spectrophotometrically, were used to monitor the enzymatic activity. Though not significantly different for the respective age groups, trypsin and. chymotrypsin levels tended to be highest at birth, dropping at about day three to day eight and then rising slightly at about six weeks of age where the values leveled off. The third area of study was the juvenile and adult adjustment to various rations. in this case, five rations varied in protein levels, ranging from a low protein level (11.2%) to a relatively high protein level (24.5%). Pancreatic trypsin and chymotrypsin levels were investigated to determine if pancreatic protease would respond to the level of protein in the diet. Again, enzyme levels were not significantly different between diets, but there was a tendency for the higher protein diets to result in higher enzyme values. / Land and Food Systems, Faculty of / Graduate
10

Indicadores morfológicos de estacionalidad reproductiva en testículos de Chinchilla laniger, (Molina, 1782) en cautiverio

Negrete Lozano, Lina January 2008 (has links)
Memoria para optar al Titulo Profesional de Médico Veterinario / En el presente trabajo se buscó identificar indicadores morfológicos para determinar estados de actividad reproductiva en Chinchilla laniger. Para esto, se estudiaron los testículos de animales adultos, mantenidos en cautiverio, durante un año. Detectando posibles variaciones en peso gonadal, cambios morfo-histológicos estacionales en los distintos compartimentos testiculares, altura del epitelio seminífero, área y diámetro tubular, índice gonado somático e índice espermatogénico. Además, se realizó un análisis inmunohistoquímico para la detección de células en proliferación por medio del antígeno nuclear de proliferacion celular (PCNA) y detección de células apoptóticas a través de la técnica de TUNEL con la finalidad de identificar los cambios en la actividad proliferativa y apoptótica en un ciclo reproductivo anual. Los resultados indicaron claras diferencias histológicas durante el año, lo que hace pensar en la existencia de distintos periodos durante un ciclo anual: reposo, recrudescencia, actividad y regresión gonadal. Las tendencias en las curvas de los indicadores mostraron un aumento en los meses de otoño- invierno y disminución en verano (diciembre, enero y febrero), por lo tanto, el testículo de la Chinchilla laniger presenta mayor actividad durante los meses de otoño-invierno, demostrando que al utilizarlos en forma complementaria son buenos indicadores de actividad reproductiva. Lo que, además, coincide con los estudios de estacionalidad reproductiva realizados a las glándulas sexuales accesorias para la especie en el mismo período

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