References

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4. Stockstad, E.L.R.; Jukes, T.H.; Pierce, J.V.; Page, A.C.; Franklin, A.L. The multiple nature of the animal protein factor. J. Biol. Chem. 1949, 180, 647.

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8. Hays, V.W. Effectiveness of Feed Additive Usage of Antibacterial Agents in Swine and Poultry Production; Office of Technology Assessment, U. S. Congress, Wash ington, D.C., 1977.

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