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Calcium and Magnesium Absorption in Growing Cattle as Influenced by Age of Animal and Source of Dietary Nitrogen^{1, 2,}

Rutgers University, New Brunswick, New Jersey 08903

Abstract

Twelve steers that varied in age were assigned to six low-fiber diets in which the nitrogen sources were different, with a younger and an older animal included in each of the treatments. The effect of age of animal and nitrogen source on absorbed calcium and absorbed and retained magnesium were evaluated over 12 weeks. Apparently absorbed calcium was higher (P<.01) in younger (537±31) than in older (341±38) animals. The rate of adaptation or change in absorption to high dietary calicum was faster in the younger animals. The younger animals absorbed calcium at a maximum rate sooner. All animals absorbed calcium at a lower rate after 9 weeks on a high calcium diet. Isolated toasted soy protein (ITS) had a negative influence on calcium absorption. Absorbed calcium for the ITS diet was lower (P<.05) than for the diets containing corn gluten, wheat gluten or urea as a nitrogen source. Ingested magnesium influenced (P<.01) the apparent absorption and retention of magnesium. No significant difference due to age of the animal, nitrogen source or ingested calcium in absorption or retention of magnesium was found.

¹ Paper of the Journal Series, New Jersey Agricultural Experiment Station, Rutgers University, New Brunswick 08903.

² Department of Animal Sciences.