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The Effect on Growing Pigs of Rations Containing Different Levels of Phosphorus in the Absence of Vitamin D¹

Kansas Agricultural Experiment Station

Abstract

The results are reported of an investigtaion of the effects of the feeding of different levels of phosphorus in the ration of three lots of young pigs for twenty-two weeks that had no access to sunshine or cod liver oil, but were on the same level of calcium.

Data are presented to show that under the conditions of this investigation the pigs receiving a ration containing 0.51 per cent phosphorus and 0.79 per cent of calcium, a phosphorus-calcium ratio of 1 to 1.5, had the best appetite, made the best gain in weight, had the best utilization of feed, and formation of bone of any of the lots of pigs.

¹ Contribution No. 130 from the Department of Animal Husbandry, and No. 226 from the Department of Chemistry.

² The authors wish to give credit to Dr. W. J. Peterson for making the chemical analyses of the feeds, to Prof. D. L. Mackintosh for assistance in slaughtering, and to Dr. C. C. Morrill for the pathological inspection of the carcasses.