Abstract
Exposure of baby chicks to low temperatures may result in considerable death losses. Variation in percentage mortality or time of death may be due to the temperature level, length of exposure, individual resistance, breed resistance, or other factors. The present study was concerned with the relative resistance of inbred, outbred, and crossbred chicks of different ages exposed to low temperature. Additional information was sought on recovery of chicks from exposure.The stock used consisted of 113 inbred White Plymouth Rocks, 395 outbred White Plymouth Rocks, New Hampshires, and White Leghorns, and 79 crossbred chicks. The inbreds had coefficients of inbreeding ranging from .34 to .67. The crossbreds included F1 and F2 generations from reciprocal matings of White Leghorns and White Plymouth Rocks. The crossbred chicks of the F2 generation were slightly inbred.Ninety-eight inbred, 242 outbred, and 79 crossbred chicks 1 day of age, and 15 inbred and 153 outbred …
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