Response of Broiler Chickens to Oral Administration of Ocimum Gratissimum Leaf Extracts

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Abstract The study was carried out on one hundred and ninety-five day-old broiler chicks of cobb500 to study the effect of Ocimum gratissimum leaf extracts on growth performance, blood profile, microbial population in the faecal and gut samples. The chicks were randomly selected into five groups with thirty-nine chicks per group and each group replicated thrice. The groups were: control (synthetic antibiotics), extracts from 200 g fresh leaf, 400 g fresh leaf, 40 g air-dried leaf and 80 g aid-dried leaf per litre of water respectively. Data collected were subjected to one-way Analysis of Variance. The growth performance except mortality was similar (P>0.05) across the groups. Albumin, urea, cholesterol, alkaline phosphate and sodium were influenced (P<0.05) at the starter phase while only alkaline phosphate was significantly (P<0.05) highest in birds on 400 g of fresh leaf extract at the finisher phase. Neutrophil was highest (P<0.05) in birds on 400 g of fresh leaf extract while those on 200 g had higher values of lymphocytes and eosinophil at starter phase. At finisher phase, birds on antibiotics and 80 g of air-dried leaf extract had higher (P<0.05) white blood cell. Faecal total microbial population was least (<0.05) in birds on antibiotics and 200 g fresh Ocimum gratissimum leaf extract at starter phase. The study concluded that the adoption of Ocimum gratissimum leaf extract as prophylactic treatment against bacteria should be encouraged among poultry farmers.

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