Williams, Melissa A., Cicero H.O. Lallo, and Donald Palmer. 2020. “Effect of Early Post-Hatch Feeding on Yolk Sac Disappearance, Feed Intake and Weight of Newly Hatched Mule Ducklings in a Tropical Environment”. Pakistan Journal of Nutrition 19 (2): 74–79. https://doi.org/10.3923/pjn.2020.74.79.