from what i understood Dave , an example, Grand father flew well or bred winners paired to a Grand daughter who flew well or bred winners ,would produce "Line bred" offspring , and so on ,,,,, .
i can remember asking when a "novice" back in (about 2006) on Basics ,the best i had was a good looking stock hen whos offspring were always there at the end of the season , and my best "old bird" racing cock had only won a 4th place in the club about pairing them together , most told me i was wasting my time. the pair produced winners that year and every year since , grandchildren have won here when i moved to Scotland . so despite (for many) a poor racer , has become one of the best stock cocks i have ?