Kaikabo, A. A., Mustapha, A., Yaroro, I. I., & Gashua, M. M. (2008). Occurrence Of Egg Impaction And Peritonitis In A Flock Of Commercial Laying Hens In Damaturu Nigeria. Nigerian Veterinary Journal, 28(3), 56–58. https://doi.org/10.4314/nvj.v28i3.3568