Backcrossing
¥ C x A
¥       ø
¥   F1 x A
¥              ø
¥      B1 x A
¥                     ø
¥         B2 x A
¥                            ø
¥            B3 x B3
¥                                   ø
¥                    B3-F2 x B3-F2
¥                                            ø
¥                    B3-F3 x B3-F3
¥                                            ø
¥                          B3-F4
Year crosses
made
old


days


1989-1995


1995-2003


2001-2011


2005-2020


2015-?