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Digestibility in selected rainbow trout families and modelling of growth from the specific intake of digestible protein

Rasmussen, Richard and Jokumsen, Alfred (2008) Digestibility in selected rainbow trout families and modelling of growth from the specific intake of digestible protein. Aquaculture International, 17 (2), pp. 187-197.

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The experiments aimed to clarify variations in digestibility of dietary nutrients in rainbow trout. Furthermore, the objective was to study how differences in digestibility might be related to growth and feed utilisation at various growth rates. When comparing the results from the experiments it appeared that particularly protein digestibility was closely related to specific growth rate and feed conversion ratio at high growth rates. As a tool to visualise the relationship between protein digestibility and growth of rainbow trout a growth model was developed based on the specific intake of digestible protein, and general assumptions on protein content and protein retention efficiency in rainbow trout. The model indicated that increased protein digestibility only partly explained growth increase and that additional factors were important for growth increment.

Summary translation

I forsøgene undersøgtes variationer i fordøjelighed hos regnbueørred samt hvorledes forskelle i fordøjelighed af næringskomponenter kunne relateres til vækst og foderudnyttelse ved forskellige vækst hastigheder. Det viste sig, at især protein fordøjelighed var tæt forbundet med specifik vækstrate og foderudnyttelse ved høje vækst hastigheder. Der blev udviklet en vækst model på basis af den specifikke indtagelse af fordøjelig protein og generelle antagelser om proteinindhold og protein retentions effektivitet i regnbueørred. Modellen indikerede, at øget protein fordøjelighed kun delvist kunne forklare vækst forøgelsen og at andre faktorer spillede en rolle for væksten.

EPrint Type:Journal paper
Keywords:rainbow trout; digestibility; selective breeding; growth model; growth; feed utilisation
Subjects: Values, standards and certification > Assessment of impacts and risks
Animal husbandry > Feeding and growth
Soil > Nutrient turnover
Knowledge management > Research methodology and philosophy
Farming Systems > Farm nutrient management
Research affiliation: Denmark > DARCOF III (2005-2010) > ORAQUA - Organic fish production
Deposited By: Jokumsen, Senior Advisory Scientist Alfred
ID Code:18750
Deposited On:04 May 2011 07:00
Last Modified:04 May 2011 07:00
Document Language:English
Refereed:Peer-reviewed and accepted

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