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Evaluation of fermented silage made from fish, tomato and potato by-products as a feed ingredient for Nile tilapia, Oreochromis niloticus
Egypt. J. Aquat., Biol., & Fish., Vol., 12, No. 1:25-41 (2008) ISSN 1110-6131 WWW.esfhd. • 2008
Publication Information
Authors
Magdy A. Soltan1 and Saeed M. El-Laithy2
Keywords
fermented silage- fish, tomato and
potato by-products - Nile tilapia,
Oreochromis niloticus
Journal
Egypt. J. Aquat., Biol., & Fish., Vol., 12, No. 1:25-41 (2008) ISSN 1110-6131 WWW.esfhd.
Publisher
Egypt. J. Aquat., Biol., & Fish.,
Volume
12
Issue
1
Pages
25-41
publication.type
International
Paper Link
Not Available
Supplementary Materials
Not Available
Abstract
ABSTRACT
Fish by-products were fermented with Lactobacillus plantarum at 30ºC
using molasses as carbohydrate source. The ensilage process was completed
after 30 days and at the end, a desirable and stable pH (4.5) was attained.
Dried tomato by-product meal (TBM) and potato by-product meal (PBM)
were used as alternative filler and blended with the liquid silage (40:30:30
w/w) and sun-dried. The resulting dried silage meal was included in the
experimental diets to replace 0, 10, 20, 30, 40 or 50% of dietary protein (by
weight) in isonitrogenous (30% CP) and isocaloric (2700 kcal ME/kg)
pelleted diets. No significant differences were found for apparent
digestibility coefficient (ADC) of dry matter (DM), crude protein (CP), ether
extract (EE) and nitrogen free extract (NFE) up to 30% inclusion level, while
the highest inclusion levels (40 or 50%) significantly reduced ADC for DM,
CP, EE and NFE.
In a 90-day growth trial, the replacing of dietary protein by fish silage
protein up to 30% of dietary protein in tilapia diet had no significant effect
on growth performance including final body weight (BW), body length (BL),
condition factor (K), weight gain (WG) and specific growth rate (SGR). The
highest replacing levels (40 or 50%) significantly (P
Fish by-products were fermented with Lactobacillus plantarum at 30ºC
using molasses as carbohydrate source. The ensilage process was completed
after 30 days and at the end, a desirable and stable pH (4.5) was attained.
Dried tomato by-product meal (TBM) and potato by-product meal (PBM)
were used as alternative filler and blended with the liquid silage (40:30:30
w/w) and sun-dried. The resulting dried silage meal was included in the
experimental diets to replace 0, 10, 20, 30, 40 or 50% of dietary protein (by
weight) in isonitrogenous (30% CP) and isocaloric (2700 kcal ME/kg)
pelleted diets. No significant differences were found for apparent
digestibility coefficient (ADC) of dry matter (DM), crude protein (CP), ether
extract (EE) and nitrogen free extract (NFE) up to 30% inclusion level, while
the highest inclusion levels (40 or 50%) significantly reduced ADC for DM,
CP, EE and NFE.
In a 90-day growth trial, the replacing of dietary protein by fish silage
protein up to 30% of dietary protein in tilapia diet had no significant effect
on growth performance including final body weight (BW), body length (BL),
condition factor (K), weight gain (WG) and specific growth rate (SGR). The
highest replacing levels (40 or 50%) significantly (P