Abstract
1. | Positive heterosis effects for the proportion of yolk, and negative heterosis for the proportion of albumen were found in crosses of six inbred Leghorn lines. | ||||
2. | Three‐way crosses showed no consistent change in egg composition when compared with matched two‐way crosses. | ||||
3. | Large differences in egg composition were found between inbred lines. | ||||
4. | The egg composition of two‐way crosses was highly predictable from the performance of their parents, while specific combining effects as measured by deviations from offspring—parent regression were relatively unimportant. |
Notes
Present address: Faculty of Agriculture, Saga University, Saga 840, Japan.