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- Present address: Animal Science Department, North Carolina State University, Raleigh, North Carolina.
- Department of Statistics, Purdue University.
- Animal Husbandry Research Division, A.R.S., U.S.D.A., Beltsville, Maryland.
- Journal paper no. 2948 of the Purdue University Agricultural Experiment Station.
- This research was supported by U.S.D.A. contract no. 12–14–100–5763(44) and conducted in co‐operation with the Poultry Research Branch, Animal Husbandry Research Division, A.R.S., U.S.D.A. as part of Regional Poultry Breeding Project NC‐47.