Show cross breeding for many years american poul thymen have by crossing different breeds produced chicks that show sex differences by the different c colors 0 I 1 0 of the males and females rhode rh ode island red males tor for exam example crossed with barred rock hock hens produce black female demalo chicks with black shanks the m males ales also black have yellow shanks and a white spot on the head bead another example of cross abrl breeding ding tor for sex determination of 0 chicks is the crossing of rapid leath feath ering single comb white leghorns Leg horns with slow feathering single comb white leghorns Leg horns the male in ale chicks have small primary win alog g feathers females Per nales hatch with larger primary wing leathers feathers cross breedin breeding has its limitations however two breeding lines must be maintained generally the wants but one breed |