An example might be a Californian X New Zealand White crossbred doe bred to a White Flemish Giant buck to produce market animals. In this case, both does and fryers exhibit hybrid vigor. Crossbreeding should only be used by producers who have a definite breeding plan. Do not keep replacements from terminal crosses designed to be market animals. It is sometimes possible to improve the vigor of offspring in the first cross.
Some people feel that using a buck on an unrelated doe is more likely to improve the strain.
This is not always the case. The most progress is made by breeding animals through intensifying the characteristics found in families through either inbreeding or line breeding. Inbreeding is breeding parents that are more closely related than the average of the population of the herd. Such close breeding does not produce bad results when it is scientifically employed. The first thing is to establish that there are no outstanding weaknesses in the participating family.