Different Crowing

[Shamo Hybrid]

I am hearing different crowing from my rooster, it's not the usual 5 syllable, "Cock-a-doodle-doo" but it's a different 4 syllable crowing........ it's normal right? My rooster does the usual one too, but this morning he was doing a lot of crowing with the 4 syllable one. I'm wondering, does that different crow signify anything? My rooster is an Oriental Gamefowl, if that matters.

 

[SueT]

Mine never varies from 5 notes....altho occasionally he puts a descending slide at the end..