C. P. NJOKU, O. Y. AYO-AJASA, D. A. EKUNSEITAN, T. A. OKUNNIYI, and M. J. AGBENIGA, “Nutrient digestibility and physiological implication of feed withdrawal periods and ascorbic acid supplementation in growing pigs under tropical environment”, Indian J of Anim Sci, vol. 89, no. 12, pp. 1377–1388, Jan. 2020, doi: 10.56093/ijans.v89i12.96643.