Digestibility Characteristics of Selected Feed Ingredients for Developing Bespoke Diets for Nile Tilapia Culture in Europe and North America
Davies, Simon J. . 2011
Abstract. – The apparent digestibility coefficients of dry
matter (ADC DM), protein (ADCp), essential amino acids
(ADC EAA), and energy (ADCe) for Nile tilapia of a
selected range of animal and plant feed ingredients found
in Western European and North American markets were
determined. The investigation was able to provide useful
data and information as a prelude for effective diet formulation
for this fish species. A reference diet was used for
the basis of assessing hydrolyzed fish protein concentrate
(CPSP), full-fat soybean meal (FFSBM), solvent-extracted
soybean meal (SESBM), maize gluten meal (MGM), poultry
meat meal (PMM), hydrolyzed feather meal (HFM),
and spray-dried hemoglobin meal (SDHM) by substitution.
For each major commercial test ingredient, the ADC were
as follows: for plant proteins – FFSBM (ADCp 86.99%
and ADCe 74.84%), SESBM (ADCp 93.46% and ADCe
82.16), and MGM which was also utilized well by Nile
tilapia (ADCp 83.03% and ADCe 82.36%); for animal proteins
– PMM (ADCp 69.30% and ADCe 73.47%), HFM
(ADCp 45.53% and ADCe 49.11%), and SDHM was highly
digested (ADCp 85.79% and ADCe 75.96%). The ADC
EAA reflected the same trends as ADCp, and these varied
from >87% on average for the EEA in fish meal, >88%
for CPSP, >84% for FFSBM, >63% for SESBM, >83%
for MGM, and only 61% for PMM, >63% for HFM, and
>77% for SDHM. Highest ADC were obtained with SDHM
and SESBMamong the animal and plant by-products tested,
respectively. These are discussed in the context of practical
diets for tilapia.
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