Oyeleke, M. O. 2021. “Effect of Feeding Varying Levels of Dietary Crude Protein and Digestible Energy Levels on Nitrogen Retention, Urinary and Blood Plasma Constituents in Pigs Fed from 9 to 60kg”. Nigerian Journal of Animal Production 41 (1):111-24. https://doi.org/10.51791/njap.v41i1.2697.