Owen, O.J., Briggs, B.P. and Gunn, H.H. 2020. Performance of broiler chickens administered graded levels of bitter kola (Garcinia kola, Heckel) as feed additive. Nigerian Journal of Animal Production. 46, 5 (Dec. 2020), 107 –. DOI:https://doi.org/10.51791/njap.v46i5.283.