Digestibility and postprandial ammonia excretion in Nile tilapia (Oreochromis niloticus) fed diets containing different oilseed by-products

Research output: Contribution to journalJournal article – Annual report year: 2015Researchpeer-review

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Digestibility and postprandial ammonia excretion in Nile tilapia (Oreochromis niloticus) fed diets containing different oilseed by-products. / Obirikorang, Kwasi Adu; Amisah, Stephen; Fialor, Simon Cudjoe; Skov, Peter Vilhelm.

In: Aquaculture International, Vol. 23, No. 5, 2015, p. 1249-1260.

Research output: Contribution to journalJournal article – Annual report year: 2015Researchpeer-review

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@article{73bbb798e5894d0d83780f4fbfda15da,
title = "Digestibility and postprandial ammonia excretion in Nile tilapia (Oreochromis niloticus) fed diets containing different oilseed by-products",
abstract = "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 (similar to 1 kg bulk weight) for the digestibility trials which spanned a total of 9 days. 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 117 mg kg(-1) day(-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.",
keywords = "FISHERIES, BASS DICENTRARCHUS-LABRAX, PROTEIN LEVEL, NITROGEN-EXCRETION, RAINBOW-TROUT, SOYBEAN-MEAL, FISH-MEAL, RATION LEVEL, GROWTH, SALMON, INGREDIENTS, Ammonia excretion, Digestibility, Growth, Oilseed meals, Postprandial, Tilapia, Life Sciences, Freshwater & Marine Ecology, Zoology, Biomedical and Life Sciences",
author = "Obirikorang, {Kwasi Adu} and Stephen Amisah and Fialor, {Simon Cudjoe} and Skov, {Peter Vilhelm}",
year = "2015",
doi = "10.1007/s10499-015-9881-z",
language = "English",
volume = "23",
pages = "1249--1260",
journal = "Aquaculture International",
issn = "0967-6120",
publisher = "Springer Netherlands",
number = "5",

}

RIS

TY - JOUR

T1 - Digestibility and postprandial ammonia excretion in Nile tilapia (Oreochromis niloticus) fed diets containing different oilseed by-products

AU - Obirikorang, Kwasi Adu

AU - Amisah, Stephen

AU - Fialor, Simon Cudjoe

AU - Skov, Peter Vilhelm

PY - 2015

Y1 - 2015

N2 - 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 (similar to 1 kg bulk weight) for the digestibility trials which spanned a total of 9 days. 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 117 mg kg(-1) day(-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.

AB - 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 (similar to 1 kg bulk weight) for the digestibility trials which spanned a total of 9 days. 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 117 mg kg(-1) day(-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.

KW - FISHERIES

KW - BASS DICENTRARCHUS-LABRAX

KW - PROTEIN LEVEL

KW - NITROGEN-EXCRETION

KW - RAINBOW-TROUT

KW - SOYBEAN-MEAL

KW - FISH-MEAL

KW - RATION LEVEL

KW - GROWTH

KW - SALMON

KW - INGREDIENTS

KW - Ammonia excretion

KW - Digestibility

KW - Growth

KW - Oilseed meals

KW - Postprandial

KW - Tilapia

KW - Life Sciences

KW - Freshwater & Marine Ecology

KW - Zoology

KW - Biomedical and Life Sciences

U2 - 10.1007/s10499-015-9881-z

DO - 10.1007/s10499-015-9881-z

M3 - Journal article

VL - 23

SP - 1249

EP - 1260

JO - Aquaculture International

JF - Aquaculture International

SN - 0967-6120

IS - 5

ER -