CONVENTIONAL FEEDSTUFFS OFANIMAL ORIGIN

Abstract

The study was carried out to investigate some chemical and mineral composition of non conventional feedstuffs of animal origin. One kilogram each of eight (8) feedstuffs namely; crayfish, dry edible hides (ponmo or ganda), grasshopper meal, poultry viscera, blood meal, bone meal and hydrolysed feather meal were used. They were labelled as treatments; T1, T2, T3, T4, T5, T6 and T7, respectively while fish meal (T8) served as control. The feedstuffs were grinded into powdered form and their proximate compositions, some chemical composition of their oil extract and mineral composition were analysed. The result showed that there was significant (p<0.05) difference in the proximate composition of all the treatments. The percentage moisture, crude protein, lipid, crude fibre, nitrogen fixed extract and ash content ranged from 1.2-10.09%, 4.19- 84.21%, 0.04-17.46%, 0- 15.81%, 0.57- 7.51% and 1.75- 91.22% respectively. However, T7(hydrolysed feather meal) recorded highest crude protein value (84.21%). There was significant (p<0.05) difference in the chemical composition of their oil extract of all the treatments. However, T7(hydrolysed feather meal) and T4(poultry viscera) recorded 8.19 and16.39mgKOH/g in the pH and free fatty acid value respectively. T8(fish meal) recorded highest value in all other parameters (acid value: 12.25mgKOH/g, peroxide value: 20.78meq/kg, iodine value: 140.52g/100g and saponification value: 195.77mgKOH/g). There was significant (p<0.05) difference in the mineral composition of all the treatments. T6(bone meal): 222374.9mg/100g and T7 (hydrolysed feather meal): 1988.6mg/100g had higher calcium content compare to T8 (control); 1250.3mg/100g. Also, T5 (blood meal): 266.35mg/100g and T6(bone meal)164.28mg/100g have higher sodium content compare to fish meal: 120.60mg/100g. However, fish meal had higher values (potassium:1355.73mg/100g, magnesium:1350.49mg/100g and phosphorus: 1550.58mg/100g) in other mineral elements. The current resultsshowed thatsome non-conventional feedstuffs such as blood meal, hydrolysed feather meal, dry edible hides and crayfish have the potentials to be used in fish feed considering their high crude protein level compared to fish meal. Also, bone meal and hydrolysed feather meal could be used as source of calcium in aquafeed. However, all the treatments were not comparable to fish meal in their lipid content. The use of these feedstuffs in fish feed will serve as alternative for fish meal. Further studies need to be carried out on the amino and fatty acid profile of these feedstuffs and on the appropriate quantity to be utilized in feed and their effects on growth and nutrient utilization of various fish species