of dietary crude fiber level on growth performance, body composition, liver
glycogen and intestinal short chain fatty acids of a tropical carp (Barbonymus
gonionotus ♀ X Hypsibarbus wetmorei male ♂)
S. Kamarudin, Muhammad A. Sulaiman* and Mohd. F.S. Ismail
Aquaculture, Faculty of Agriculture, Universiti Putra Malaysia, 43400 UPM
Author E-mail: firstname.lastname@example.org
Intestinal short chain fatty
Lemon fin barb hybrid
Paper received : 05.07.2017
Revised received : 20.09.2017
Re-revised received :
Accepted : 28.12.2017
Aim: A 60-day feeding
trial was conducted to determine the maximum dietary crude fiber level a
tropical carp, lemon fin barb hybrid, could tolerate in their diet.
Methodology: Twenty fish (1.50
± 0.05 g) were randomly stocked per 100 l aquarium tank in 3 replicates and
fed twice a day with 5 isonitrogenous (30% protein), isocaloric (17 kJ g-1),
35% carbohydrate and isolipidic (4%) test diets containing 0, 5, 10, 15 and
20% crude fiber until apparent satiation.
Results: The survival
(100%) was unaffected by the dietary fiber level although weight gain,
specific growth rate, and protein efficiency ratio significantly decreased
(p<0.05) as dietary fiber level increased. The best feed conversion ratio
(1.52) was achieved at 5% fiber level, while the protein retention increased
upto 5% fiber level and decreased beyond this level. Whole body lipid
significantly decreased (p< 0.05) with increasing dietary fiber level, whereas
the body carbohydrate showed an opposite trend. No significant difference was
found to the intestinal butyric acid, although acetic acid and propionic acid
were higher in fish fed 0-10% crude fiber.
Interpretation: Using a second
order polynomial regression analysis, the recommended dietary fiber level for
the hybrid was estimated at 5.2 % based on specific growth rate, which
corresponded to a gross energy requirement of 17 kJ g-1. It was
concluded that the hybrid fingerlings could tolerate and utilise up to 10%
dietary fiber at a total carbohydrate level of 35%.
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