Alaviuhkola, Timo, Kaija Suomi, and Axel Schulman. “Effect of Dietary Vitamin A Level on Performance, Vitamin A Content in the Liver and Leg Weakness of Growing Finishing Pigs”. Agricultural and Food Science 1, no. 5 (September 1, 1992): 471–475. Accessed December 23, 2024. https://journal.fi/afs/article/view/72459.