References

1. Fleming, A. On the antibacterial action of cultures of a Penicillium, with special reference to their use in the isolation of B influenzae. Brit. J. Exp. Pathol. 1929, 10, 226.

2. Chain, E.; Florey, H.W.; Gardner, A.D.; Heatley, N.G.;

Jennings, M.A.; Orr ewing, J. Penicillin as a therapeutic agent. Lancet 1940, 2, 226.

3. Dugger, B.M. Aureomycin: A product of the continuing search for new antibiotics. Ann. N.Y. 1940, 51, 177.

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.

5. Raper, K.B. A decade of antibiotics in America. Mycologia 1952, 44, 1.

6. Wachholz, D.E.; Heidenreich, C.J. Effect of tylosin on swine growth in two environments. J. Anim. Sci. 1970, 31, 104.

7. Hays, V.W.; Speer, V.C. Effect of spiromycin on growth and feed utilization of young pigs. J. Anim. Sci. 1960, 19, 938.

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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