Horn phenotype F (rams).
A long scur, approximately 4 inches, to 10-12 inches in length.
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Photo courtesy of Stephen Rouse of Sheltering Pines, Allegan, MI.
Long scurs can grow quite long, and can be confused with regular  ram horns. It has been my observation that they are generally smoother, have a narrower horn base, and lack the ridges and rings around the horn that mature horned rams develop.
These three scurred ram photos courtesy of Rebecca Robinson of Iowa.