1. The research was carried out to investigate correlations between breeder age, egg cholesterol content, blood cholesterol level and hatchability of broiler breeders.
2. Egg cholesterol content increased with increased breeder age. The mean yolk cholesterol contents (mg per g yolk) were 10·47 ± 0·28, 15·34 ± 0·65 and 15·64 ± 0·71 mg/g at 28, 45 and 65 weeks of age, respectively.
3. There were positive correlations between yolk weight and yolk cholesterol content (mg/g yolk) (r = 01·941; P