A. H. Mimeo Series 63-24
Since the introduction of SPF pigs on farms, nutritionists have wondered if the nutrient requirements of the pigs are similar to non-SPF pigs. Theoretically if the animal does not have a physiological stress, such as disease, and a good environment is provided, he should gain faster and thereby need more daily nutrients. However, the healthy, fast gaining pig will normally eat more feed in order to meet his nutrient requirements. Consequently, the nutrient requirements in terms of amount of nutrient per pound of total feed should generally be the same for SPF and non-SPF pigs. The word generally is emphasized because a specific requirement of a microingredient (s) might be slightly different. Already a few swine producers of pigs have questioned the calcium and phosphorus requirements. Their concern logically developed from observations of stiff legs and more feet and leg trouble with the SPF pigs than was observed in the herd before repopulating with SPF pigs. With these observations in mind, two field trials with various levels of calcium and phosphorus in the ration were initiated at the Eureka Experiment Station.
Number of Pages
Agricultural Experiment Station and Extension Service, South Dakota State College
Seerley, R.W.; McCarty, J.W.; and Dittman, A.E., "Calcium and Phosphorus for Growing-Finishing Specific-Pathogen-Free Pigs" (1963). South Dakota Swine Field Day Proceedings and Research Reports, 1963-11-11. 4.