caa a22 4500 60546474X CHVBK 20210128100259.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s10499-015-9881-z doi (NATIONALLICENCE)springer-10.1007/s10499-015-9881-z Digestibility and postprandial ammonia excretion in Nile tilapia ( Oreochromis niloticus ) fed diets containing different oilseed by-products [Elektronische Daten] [Kwasi Obirikorang, Stephen Amisah, Simon Fialor, Peter Skov] The present study was undertaken to evaluate the potential for using oilseed by-products (soybean, copra and palm kernel meals) as partial replacements of fishmeal in feeds for Nile tilapia (Oreochromis niloticus). Nutrient digestibility and postprandial ammonia excretion rates were examined. A fishmeal-based diet served as control against three test diets in which 30% of each of the oilseed by-products was included. Diets were randomly assigned to triplicate groups of fish (~1kg bulk weight) for the digestibility trials which spanned a total of 9days. The partial inclusion of oilseed meals did not significantly affect apparent protein digestibility, although lipid, ash and dry matter digestibilities were significantly affected (p<0.05). Fish fed the soybean meal diets significantly reduced their feed intake and showed lower growth and feed utilization efficiencies over the trial period. The inclusions of the plant proteins caused a reduction in ammonia excretion rates with the palm kernel meal diet recording the lowest mean excretion rates of 117mgkg−1day−1 which was twofold lower than the highest mean daily ammonia excretion rate of the fish group fed the fishmeal-based control diets. Overall, the study confirmed the potential of using copra and palm kernel meals to partially replace fishmeal in Nile tilapia diets based on their effects on short-term growth and feed utilization, nutrient digestibilities and lower ammonia excretion rates, while soybean meal in an unrefined form is not a promising replacement for fishmeal in tilapia diets. Springer International Publishing Switzerland, 2015 Ammonia excretion nationallicence Digestibility nationallicence Growth nationallicence Oilseed meals nationallicence Postprandial nationallicence Tilapia nationallicence Obirikorang Kwasi College of Agriculture and Renewable Natural Resources, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana aut Amisah Stephen College of Agriculture and Renewable Natural Resources, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana aut Fialor Simon College of Agriculture and Renewable Natural Resources, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana aut Skov Peter DTU Aqua, Section for Aquaculture, The North Sea Research Centre, Technical University of Denmark, PO Box 101, 9850, Hirtshals, Denmark aut Aquaculture International Springer International Publishing 23/5(2015-10-01), 1249-1260 0967-6120 23:5<1249 2015 23 10499 https://doi.org/10.1007/s10499-015-9881-z text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10499-015-9881-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Obirikorang Kwasi College of Agriculture and Renewable Natural Resources, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana aut NATIONALLICENCE 700 1- Amisah Stephen College of Agriculture and Renewable Natural Resources, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana aut NATIONALLICENCE 700 1- Fialor Simon College of Agriculture and Renewable Natural Resources, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana aut NATIONALLICENCE 700 1- Skov Peter DTU Aqua, Section for Aquaculture, The North Sea Research Centre, Technical University of Denmark, PO Box 101, 9850, Hirtshals, Denmark aut NATIONALLICENCE 773 0- Aquaculture International Springer International Publishing 23/5(2015-10-01), 1249-1260 0967-6120 23:5<1249 2015 23 10499