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Dietary Ca/P ratios of 1 : 1, 4:1, and 8 : 1 were studied in 30 Holstein steers in a 168day 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 4il 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.
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Ricketts et al. (1970) studied this question.
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