Breeding system, feeding type, and climate change effects on weight and hemogram values of bullfrog (Rana catesbeiana)
The purpose of this study was to determine hemogram reference values, and sex, age, weight, climate, breeding and feeding system physiological modifications in bullfrog, Rana catesbeiana. Three hundred and two healthy animals (both sexes, 9–21 months old), were studied in breeding places in northeas...
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| Autores principales: | , , |
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| Formato: | Artículo |
| Lenguaje: | Español |
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Universidad Nacional del Nordeste. Facultad de Ciencias Veterinarias
2022
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| Acceso en línea: | http://repositorio.unne.edu.ar/handle/123456789/48922 |
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| Sumario: | The purpose of this study was to determine hemogram reference values, and sex, age, weight, climate, breeding and feeding system physiological modifications in bullfrog, Rana catesbeiana. Three hundred and two healthy animals (both sexes, 9–21 months old), were studied in breeding places in northeast Argentina. Reference intervals for hematocrit (28.6–31.6%), erythrocytes (0.40–0.44 T/l), hemoglobin (6.41–7.20 g/dl), MCV (686–732 fl), MCH (151–164 pg) and MCHC (22.6–24.0%) were obtained. When these values are compared to those from other species, erythrocytes and hemoglobin low concentrations as well as MCV and MCH high values stood out. Weights correlated significantly with ages (r=0.82, p=0.02) but they were lower than those obtained in the same lapse on high technology hatcheries; in northeast Argentina the sacrifice weight (170 g) is achieved at 12 months rather than at 6–7 months. On adult frogs (older than 12 months), higher weights were registered in those fed naturally in lagoons, and those fed on balanced pellets (45% of proteins) and worms placed on the floor. The lowest weights were verified in frogs fed on bovine viscera (milled lung) floating on the water. When age and weight increased (growth advance), hematocrit, erythrocytes and hemoglobin values increased significantly, at the same time that MCH diminished. Although the weight and hemogram values from females were lightly higher than those from males, no significant differences between sexes were found. Lower weight gains and diminished hematic values, were registered during winter. The use of hemogram to evaluate nutritional and sanitary state is suggested, since its application is a way to improve the frog meat production. |
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