Abstract
Natural feed additives are efficient in reducing the need for antibiotics therefore, nutritionists are using plant-based feed additives such as garlic. This study evaluated the effect of garlic on the growth and hematological parameters of H. longifilis juveniles in a 56-day feed trial. H. longifilis juveniles (57.80±26.7g) were divided into fifteen circular tanks (60 liters capacity) and stocked 10 fish per tank in three replicates. Five experimental diets were formulated, each containing varying amounts of garlic powder: 0.00 (control) 0.01g/kg, 0.015, 0.02, and 0.025g/kg designated as G0, G1, G2, G3, and G4, respectively. Fish were fed 2% body weight twice daily. The results revealed that fish fed 0.015g/kg of garlic gave a significantly (P<0.05) higher mean weight gain of 8.39g±0.84 while fish fed control gave the lowest mean weight gain of 1.3g±0.00. The specific growth rate and mean feed intake followed the same pattern but showed no significant difference (P>0.05). The food conversion ratio was relatively high in the fish fed the control group and lowest in fish fed G2 diet. The Hematological parameters of garlic-supplemented diets showed a general decrease except for Total white blood cells. The Packed cell volume, Hemoglobin, and Total red blood cell values were significantly (P<0.05) higher in the control than in fish fed with garlic-supplemented diets. The Total white blood cells showed a significant (P<0.05) increase in fish fed with a garlic-supplemented diet. This indicates garlic inclusion in the diet of H. longifilis should be minimal and 0.015g/kg is recommended.
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