Abstract
The fat content and the concentrations of glucose and triglyceride in day-old chicks hatched from 27 and 60 wk-old broiler-breeder hens were determined from pooled samples of residual yolk and blood serum, respectively. Serum glucose and triglyceride levels were unaffected (P>.05) by breeder age, although there was a linear (P<.001; r = .67) relationship between these characteristics and chick weight Yolk fat, adjusted for chick weight, was on the average 13% greater (P<.05) in chicks from old breeders than chicks from young breeder hens. Yolk wet weight was not affected (P>.05) by breeder age. Results indicate mat breeder age may affect chick performance through alterations in the fat content of residual yolk.
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