To Standardise Parameters for Preparation of Extruded Feed Using Various Conventional and Non-Conventional Ingredients
Puneet Kumar Patel *
College of Fisheries (NDUA&T), Kumarganj, Ayodhya, India and College of Fisheries (OUAT), Rangailunda, Berhampur -760007, Odisha, India.
Brundaban Sahu
College of Fisheries (OUAT), Rangailunda, Berhampur -760007, Odisha, India.
Saumyendra Nanda
College of Fisheries (OUAT), Rangailunda, Berhampur -760007, Odisha, India.
Priyanka Acharya
College of Fisheries (OUAT), Rangailunda, Berhampur -760007, Odisha, India.
Dinesh Kumar
College of Fisheries (NDUA&T), Kumarganj, Ayodhya, India.
Lavkush
College of Fisheries (NDUA&T), Kumarganj, Ayodhya, India.
Venkatesh K
College of Fisheries (OUAT), Rangailunda, Berhampur -760007, Odisha, India.
*Author to whom correspondence should be addressed.
Abstract
The purpose of this research was to optimise extruder parameters for the preparation of floating fish diets with appropriate physicochemical qualities. The impact of temperature (90-120oC), moisture content (15%-30%), die diameter (2.0-4.0 mm) and pre-conditioning duration (15-30 m) on physical properties of the pellets such as bulk density, floatability, expansion ratio and water stability, were examined. Accordingly, four iso-nitrogenous (crude protein 35%) experimental diets were formulated for GIFT tilapia advance fry by replacing 50% of GNOC protein of the control diet (T0) by sunflower oilcake (SFOC) (T1), by linseed oilcake (LSOC) (T2) and by fish based silage (T3) protein. The pellets extruded using a combination of 120 oC extruder barrel temperature, 25% moisture content of feed mix, 2.0 mm die diameter and 30 minute of pre-conditioning duration gave most required pellet floatability (90-100%), expansion ratio (1.43-1.61), water stability (95-99%) and bulk density (0.8 - 0.9 g/cm3) for T1 and T2. However, fish silage when incorporated in the feed mix, it affected negatively in all the physical characteristics of a floating feed and resulted in higher bulk density and lower floatability, expansion ratio and also water stability.
Keywords: Twin screw extruder, GIFT tilapia, sunflower oil cake, linseed oil cake, fish silage