ESIEGWU, A.; OBIH, T. Growth performance, haematological and serum biochemical indices of broiler starter chickens offered dietary supplement of comfrey leaves extract. Journal of Agriculture and Food Sciences, [S. l.], v. 19, n. 1, p. 48–62, 2021. DOI: 10.4314/jafs.v19i1.4. Disponível em: https://www.ajol.info/index.php/jafs/article/view/210896. Acesso em: 6 aug. 2026.