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Effects of Tallow in Swine Rations on Utilization of Calcium and Phosphorus¹

Louisiana Agricultural Experiment Station, Baton Rouge

Abstract

Results of feedlot performance and radio-chemical balance studies indicate that 0.2% calcium was suboptimum and 0.4% calcium appeared to be borderline for growing swine. Maximum feedlot performance of pigs was attained at dietary calcium and phosphorus levels of 0.6 and 0.45%, respectively. Restriction of calcium intake increased efficiency of calcium absorption and retention. Added tallow had no consistent effects on calcium digestibility, but depressed the apparent digestibility of dietary phosphorus. Endogenous fecal calcium loss was greatest in pigs fed the high calcium diets, but was not affected by the level of dietary tallow.

¹ Published with the approval of the Director, Louisiana State Agricultural Experiment Station, Baton Rouge, Louisiana.

² Present address: Department of Animal and Range Sciences, Montana State University, Bozeman, Montana.