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Effect of Three Calcium:Phosphorus Ratios on Performance of Growing Holstein Steers^1,2,

Department of Dairy Husbandry
and Department of Veterinary Physiology and Pharmacology, University of Missouri, Columbia 65201

ABSTRACT

Dietary Ca/P ratios of 1:1, 4:1, and 8:1 were studied in 30 Holstein steers in a 168-day split plot in time and space experiment. A factorial arrangement among feed intakes and Ca/P ratios existed at each time period.

Animals receiving the 8:1 Ca/P ratio diets gained less daily than the 1:1 and 4:1 groups. Animals fed the 1:1 Ca/P ratio diets had higher serum inorganic phosphorus, lower serum calcium, and a narrower serum Ca/P ratio than those fed the 4:1 and 8:1 diets. There were no adverse effects on average daily gain and feed efficiency from feeding the 4:1 Ca/P ratio diet.

¹ Contribution from the Missouri Agricultural Experiment Station. Journal Series 5739. Approved by the Director.

² This investigation was supported in part by Grants PE-07053 and FR-00285 from the U.S. Public Health Service.