Feather growth genetics F2,F3 +?

[KAGs waterfowl]

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What are you trying to figure out?

If I breed a leghorn male to a “very slow feathering” breed, what is the offspring like? Are they wing feather sex-able? And what if I breed a RIR male to a “Very slow feathering” breed?

 

[The Moonshiner]

A leghorn male over slow feathering female will be wing sexable offspring.
A RIR's offspring would not be.

 

[KAGs waterfowl]

Thank you for the info, The Moonshiner.