In vivo digestibility of animal and plant based ingredients and diets for pre-adult redclaw crayfish (cherax quadricarinatus)
- Format
- MasterThesis
- Status
- publishedVersion
- Description
The absence of nutritionally well balanced and cost-effective aquafeeds have hindered the redclaw aquaculture industry potential for growth and expansion. The determination of nutrients digestibility of ingredients is an important step in the formulation of worthwhile diets. This study assessed the digestibility of four plant based and two animal origin ingredients for pre-adult redclaw crayfish. Six test diets were based on a 30% substitution of ingredient in a reference diet which was a commercially available redclaw diet. The ingredients evaluated in this study were: copra meal (CM), wheat bran (WB), blood meal (BM), corn gluten (CG), wheat gluten (WG) and meat and bone meal (MBM). Proximate chemical analysis of ingredient and diets was accomplished to determine the nutrient profile. Digestibility of diets and ingredients was determined using the indirect method employing Yttrium as inert marker. Test diets tended to decrease in digestibility in respect to reference diet; however, crude lipid (CL) digestibility was improved. Apparent digestibility coefficients (ADC?s) were statistically different among diets. WG and CM diets were the best digested. Ingredients apparent digestibility coefficients (IADC?s) showed a high response for WG, CM and CG for plant based materials, and BM for animal feedstuff. A positive correlation was exhibit by crude protein (CP) and digestible protein (DP) level. Daily feed intake (DFI) was statistically different among diets, WG diet was the less palatable. DP and dietary energy (DE) were low correlated to DFI. Performance of redclaw was equal among treatments, animals decreased in weight but increased in length. Overall survival was over 85%. Redclaw demonstrated very good potential to efficiently digest different feed materials of plant and animal origin indicating flexibility to choose a broad range of sources to formulate cost-efficient diets that fulfil the nutritional requirements of this specie.
- Publication Year
- 2014
- Language
- eng
- Topic
- NUTRICI?N DE ESPECIES ACU?COLAS
TECNOLOG?A DE ALIMENTOS
CULTIVO DE ESPECIES ACU?COLAS
ESTAD?STICA
- Repository
- Repositorio SENESCYT
- Rights
- openAccess
- License