Effect of Level of Soybean Protein and Ergocalciferol on Mineral Utilization by the Baby Pig

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Abstract
Two trials were conducted using a total of 28 baby pigs to determine the effects of varying levels of dietary isolated soy protein and ergocalciferol upon mineral utilization. Diets contained 16, 24 or 32% of crude protein from isolated soy protein and 6.25 or 12.5 mcg. of ergocalciferol/kg. of diet. Performance and levels of serum Ca, Mg and protein were not affected by dietary protein intake. Serum inorganic P, however, decreased with increasing isolated soy protein levels in the diet in trial I. This effect appeared to be modified somewhat in trial II when ergocalciferol was added at a higher level in the diet. Serum alkaline phosphatase values were generally inversely related to serum inorganic phosphorus values. Mineral balance studies did not show any significant differences in mineral retention due to protein level or dietary vitamin D level. Balance studies showed an increase in total urine volume, urinary nitrogen and nitrogen retention as protein levels in the diet increased. Bone studies showed that bone mineralization, as indicated by specific gravity, humeral mineral analyses and femur breaking strength, was depressed when high levels of soy protein were fed and that this depression was not overcome by increased dietary ergocalciferol.

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