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The Feed Value of Fresh Bone

Department of Animal Husbandry, Cornell University, Ithaca, New York

1. From a series of mineral balances using two litters of growing beagles, the availability of the calcium of ground, fresh, whole bone was found to be 56%. The availability of the phosphorus in these diets, 40% of which was supplied by the bone, was 49%.

2. From nitrogen balances on adult beagles fed diets in which the protein was supplied by fresh bone, it was found that 45% of the protein was available to the dog.

3. Treatment of the bone with acid and pressure cooking decreased the nitrogen loss as compared with untreated bone, whether coarsely or finely ground.

4. A microbiological determination of the amino acid composition of bone protein showed methionine to be the limiting amino acid.

5. Supplementation with methionine of a diet in which bone supplied the protein produced good growth in your rats, and further supplementation with histidine or isoleucine did not give any added growth.

Manuscript received 7 August 1952.