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• W87231750 abstract "The purpose of this study was to determine plasmatic non protein nitrogen (NPN) reference values according to sex, age, liveweight, season, and breeding and feeding systems physiological modifications in bullfrog, Rana catesbeiana .Three hundred and two healthy animals (both sexes, 9 to 21 months old) were studied. They were reared in 3 different hatcheries in northeastern Argentina. Reference values (mean ± standard deviation) were recorded for plasmatic creatinine (4.83±1.22 mg·L -1 ), urea (84.2±17.5 mg·L -1 ), and uric acid (13.4±2.89 mg·L -1 ) . A significant correlation between growth and liveweight increase (r =0.82, P =0.02) ) was found. Significant lineal association among animal development, creatinine and urea increase, as well as uric acid decrease (P < 0.05), were registered. No significant differences were found between sexes. In amphibians fed naturally in lagoons, urea concentration was higher (105 mg·L -1 ) than those fed with milled lung (63.8 mg·L -1 ); amphibians fed with balanced pelleted diets registered intermediate values. Rearing system had a significant influence on the plasmatic NPN levels. Creatinine and uric acid lowest values were registered in amphibians coming from hatchery 3 (water covering 90% of the tank’s floor, floating feed), and highest urea and creatinine values (significant), as well as highest uric acid values (not significant), were registered in frogs reared in hatchery 1 (water covering 25% of the tank’s floor, feed supplied on dry floor). Cold season (hibernation) produced plasmatic NPN increase, significantly for urea concentration (90.1 mg·L -1 in winter versus 79.5 mg·L -1 in the remaining seasons). Utility of plasmatic NPN to evaluate sanitary, metabolic, and nutritional state of meat production frogs, is emphasized. El proposito del estudio fue obtener valores de referencia para nitrogeno no proteico (NNP) plasmatico y sus variaciones fisiologicas segun sexo, edad, peso, clima y sistemas de manejo y alimentacion en Rana catesbeiana . Se estudiaron 302 animales sanos (ambos sexos, 9-21 meses de edad), mantenidos en tres criaderos del nordeste argentino. Se obtuvieron intervalos de referencia para creatinina (4,83±1,22 mg·L -1 ), urea (84,2±17,5 mg·L -1 ) y acido urico (13,4±2,89 mg·L -1 ). El crecimiento correlaciono con el aumento de peso (r=0,82, p=0,02). Se registro asociacion lineal significativa entre el avance de la edad y los aumentos de creatinina y urea, asi como con la disminucion de acido urico (P<0,05). No se encontraron diferencias significativas entre sexos. La urea fue mas alta en anfibios alimentados naturalmente en laguna (105 mg·L -1 ) que en animales alimentados con pulmon molido (63,8 mg·L -1 ). El manejo influencio significativamente los niveles de NNP. Los valores mas bajos de creatinina y acido urico fueron registrados en anfibios del criadero No 3 (agua cubriendo el 90% del piso de las piletas, alimento flotante), y los valores mas altos de urea y creatinina (significativos), asi como de acido urico (no significativos), fueron registrados en el criadero No 1 (agua cubriendo el 25% del piso de las piletas, alimento suministrado sobre piso seco). El clima frio (hibernacion) produjo aumento del NNP, significativamente para la urea (90,1 mg·L -1 en invierno versus 79,5 mg·L -1 en las estaciones restantes). Se enfatiza la utilidad del NNP para evaluar estado sanitario, metabolico y nutricional de las ranas explotadas para produccion de carne." @default.
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• W87231750 date "2006-08-05" @default.
• W87231750 modified "2023-09-23" @default.
• W87231750 title "Baseline for some plasmatic and physiological variables in Rana catesbeiana." @default.
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• W87231750 doi "https://doi.org/10.7764/rcia.v33i2.341" @default.
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