Umesiobi, D. O., M. U. lloeje, and N. A. Berepubo. “Artificial Insemination in Sows Using Guelph and Two Local Semen Extenders”. Nigerian Journal of Animal Production 29, no. 1 (January 1, 2021): 121–126. Accessed August 3, 2026. https://njap.org.ng/index.php/njap/article/view/1541.