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Abstract
1. The pattern of variation for egg yolk cholesterol concentration between 5 commercial egg layer lines and a cross of Gallus domesticus is described.
2. Yolk cholesterol concentration in the cross was lower than in the lines, and 6–7% lower than the midparent value.
3. It is proposed that the reduced yolk cholesterol concentration of the cross may be a consequence of heterosis, although sex‐linkage and/or maternal effects cannot be discounted.
4. The difference between the cross and parental lines is consistent with a physiological relationship between yolk cholesterol concentration and rate of egg production, but not between yolk cholesterol concentration and yolk weight.
Notes
Current addresses: ‘Department of Human Anatomy and Cell Biology, The University of Liverpool, PO Box 147, Liverpool L69 3BX, UK
Ross Breeders Ltd, Newbridge, Midlothian EH28 8SZ, UK.