| Autor: | Joaquim Luís Coimbra, A. Figueiredo, E. Gomes, M. Monteiro, António Fontaínhas-Fernandes, Ma.A. Reis-Henriques |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
medicine.medical_specialty
food.ingredient biology business.industry Fish farming Tilapia Aquatic Science biology.organism_classification Oreochromis Nile tilapia Animal science Endocrinology Fish meal food Aquaculture Blood chemistry Plant protein Internal medicine medicine business Agronomy and Crop Science |
| Zdroj: | Aquaculture International. 8:299-313 |
| ISSN: | 0967-6120 |
| DOI: | 10.1023/a:1009217310464 |
| Popis: | This study was conducted to evaluate theeffect of plant protein‐based diets on gonadaldevelopment and plasma 17 β-estradiol (E2) levelin female Nile tilapia Oreochromis niloticus.Fish with a mean body weight of 6.7 (0.1) g were fedfour different diets with the same digestible protein(DP) and digestible energy (DE) containing gradedlevels of a mixture of plant ingredients as partial ortotal replacement of fish meal protein for 20 weeks.The control diet (D0) was based on fish meal, twodiets containing 33% (D33) and 66% (D66) of plantprotein, and one diet containing only plant protein(D100). Fish were sampled at 12 and 20 weeks. Nosignificant differences were found in different stagesof oocyte development and plasma E2 levels betweentilapia fed diets D0 and D100 at 12 weeks. Eight weekslater tilapia fed diet D0 showed a higher (P < 0.05)level of E2 than the D100 group. This difference andthe reduced proportion of vitellogenic and matureoocytes demonstrated that diets containing only plantprotein are less efficient in terms of tilapia growthand consequently ovarian development. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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