Physical properties of extruded aquafeed with a combination of sago and tapioca starches at different moisture contents

Abstract

This study was conducted to determine the effects of sago-tapioca starch ratio and moisture level of feed mixture on the physical properties of a Malaysian mahseer (Tor tambroides) extruded diet. Fifteen iso-nitrogenous diets containing varying ratios of sago-tapioca starch (20:0, 15:5, 10:10, 5:15 and 0:20) and varying moisture contents (200, 300, and 400 g/kg) were formulated. The feed mixtures were extruded using a single-screw extruder. The barrel temperature profile was set at 80-100-120 °C while the die temperature was set at 160 °C. The physical properties of extruded diets (bulk density, expansion rate, floatability, water stability, pellet durability index, sinking velocity and scanning electron microscopy) were investigated. The results showed that increasing moisture level of diet from 200 g/kg to 400 g/kg increased (P<0.05) the value of all physical properties examined. The best moisture level to produce best floating extrudates using sago or tapioca or their combination was 400 g/kg. Sago starch and combinations of the sago-tapioca starch performed as good as tapioca starch alone.

Effects of extruded pellet and moist pellet on growth performance, body composition, and hematology of juvenile olive flounder, Paralichthys olivaceus

“…It is well documented that extruded pellets have superior water stability, better floating properties, and a higher energy content among the pelleted diets (Hilton et al 1981;Johnsen and Wandsvik 1991;Ammar 2008). Aqua feed technology is moving in tandem with the aquaculture growth with the usage of extrusion procedures for the improvement of digestibility (Umar et al 2013). Chang and Wang (1999) stated the advantages of extrusion cooking process for aquaculture feed production including improved feed conversion ratio, control of pellet density, greater feed stability in water, better production efficiency, and versatility.…”

Physico-chemical properties of extruded aquafeed pellets containing black soldier fly (Hermetia illucens) larvae and adult cricket (Acheta domesticus) meals

“…This was done in 3 replicates and average number of pellets that were found floating after 20 min was recorded. Floatability was calculated as the number of floating pellets after 20 min divided by the total number of pellets introduced in the water multiplied by 100 (Khater et al, 2014;Umar et al,2013).…”

“…Pellet durability index was determined as outlined by Umar et al (2013). About 15 g of each sample was sieved on a 2.36 mm sieve in triplicate.…”

Vacuum coating of pelleted feed for broilers: Opportunities and challenges

“…After moisture is removed during cooling and drying, there may be an increase in porosity. Similarly, with extrudates, Umar et al (2013) demonstrated that as the moisture content increases, the porosity also increases. However, an excess of moisture can decrease the friction in the pellet die and reduce compression (i.e., increasing porosity, but possibly reducing durability).…”