Theiler, A.; Du Toit, P.J.; Malan, A.I.; Du Toit, P.J.
(Pretoria : Government Printer, 1937)
Bethke and associates (1933) and Dunlop (1935) conclude that growing pigs require approximately 0 - 6 percent P in their rations and that maximum growth is obtained with a Calcium-phosphorus ratio
between 1:1 and 2:1. ...