Abstract
A strain of turkeys developed by selecting for increased egg production (E) was compared with its corresponding randombred control (RBC1) in the 18th and 19th generations of selection for response to cold stress at 4 weeks of age. Similarly, a growth selected strain (F) was compared with its control (RBC2) in the 12th generation of selection. Response to cold stress was measured by the plasma corticosterone level after cold stress (4 C for 4 hr) at 4 weeks of age.Increases in egg production in the E strain were associated with decreases in growth rate and increases in plasma corticosterone level after cold stress. Conversely, increases in growth rate in the F strain were associated with decreased egg production and decreased plasma corticosterone level after cold stress.
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