Why not, conceptually?

[Norselord]

Rack on to ale yeast in the primary at 75F and then (for example) at 50% fermentation rack on to lager yeast and continue for a bit at 54F?

Or vice versa?

Are there any lager/ale yeasts?

 

[IffyG]

I'm not sure what you would accomplish doing that. Ale yeast is intended to produce a more esters and lager yeast is intended to produce clean flavor profiles. If you did it, my guess would be the ale yeast character would dominate.

 

[Euphist]

Well, at 50% fermentation, the ale yeast will still be in suspension, so racking wouldn't really accomplish anything...

Yes, there are lager/ale yeasts, they're called California Common yeasts.

 

[RainyDay]

Hmm, interesting idea, Im curious to see what would happen. The only hybrid yeasts I know of are a Kolsh and German Ale yeast. You should totally do it!

 

[passedpawn]

It'll taste like an ale if you ferment at 75 with any yeast, ale or lager.

 

[Effingbeer]

I don't have any idea what the OP really intends, but a good ale/lager yeast blend is the cream ale blend from White Labs-WLP080. I ferment at 62-64F.

 

[brewguyver]

Starting @ 75 might be a little rough on the pallet, depending on the strain. If your willing to experiment though, why not?