Patterns and Rates of Ammonia Excretion by Juvenile American Lobsters, Homarus americanus, Fed Casein- and Crab Protein-Based Diets
| Autor: | J. D. Castell, V. Leroyer, C. M. Hawkins |
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| Rok vydání: | 1986 |
| Předmět: | |
| Zdroj: | Canadian Journal of Fisheries and Aquatic Sciences. 43:1290-1294 |
| ISSN: | 1205-7533 0706-652X |
| DOI: | 10.1139/f86-160 |
| Popis: | The rate of excretion of nitrogenous wastes is not only a function of an animal's metabolic status but is also a function of the nutritional quality and quantity of dietary protein. Hourly rates of ammonia excretion by Stage V and Stage VI juvenile lobsters, Homarus americanus, fed purified diets formulated with casein or a purified crab protein, were measured over 24 h postfeeding to evaluate differences in use efficiencies of these two dietary proteins. Hourly ammonia excretion rates by Stages V and VI lobsters fed the casein-based formulated diets were significantly higher than those of animals fed the crab protein formulation. In addition to differences in ammonia excretion rates observed between animals fed the two diets, regular but different recurring patterns in hourly excretion rates were found between Stages V and VI lobsters fed each diet. Our findings illustrate that although the percentage of protein in the food of juvenile lobsters may be similar, the use of the nitrogen component is significantly different. We conclude that the quality of the protein in a diet may be as important (if not more important) as its quantity. |
| Databáze: | OpenAIRE |
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