Previous to this experiment two trials were conducted here that did not indicate a need for supplemental vitamin D for growing pigs fed in the absence of direct sunlight. In these previous trials a complete mixed ration containing recommended amounts of calcium and phosphorus was fed. The experiment reported here was conducted to see if supplemental vitamin D was required for growing pigs in the absence of sunlight when a mineral supplement was fed free-choice as cell as when a complete mixed ration was fed.
Number of Pages
Agricultural Experiment Station and Extension Service, South Dakota State College
Wahlstrom, Richard C., "The Effect of Vitamin D in Rations for Growing Pigs Fed in the Absence of Direct Sunlight" (1957). South Dakota Swine Field Day Proceedings and Research Reports, 1957. 4.