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Whole body weight (g) of layer and broiler chicks aged embryonic days (EDs) 5 to 18. Results are presented as means±S.E.M. (n=4 animals per strain per day); 1, 2 or 3 asterisks represent significant differences at either P<0.05, 0.01 or 0.0001, respectively, between strains on one particular sample day.
