REFERENCES
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- Halbrook, E. R.: Ph.D. thesis, Ohio State Univ. 1950.
- Horton-Smith, C. and Long, P. L.: Proc. Xth World's Poultry Congr., Edinburgh, Sect. C, 266 (1954).
- Kennard, D. C., Bethke, R. M. and Chamberlain, V. D.: Poultry Sci. 27: 447 (1948).
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