Lag time with u.s 05

Supposedly, the manufacturer gets the yeast into a state where the sterols (cell wall building material) needed for cell division have already been made/incorporated before drying. So they don't need additional oxygen.

 

Below is some information from a Danstar FAQ:

“There is no need to aerate the wort but it does not harm the yeast either. During its aerobic production, dry yeast accumulates sufficient amounts of unsaturated fatty acids and sterols to produce enough biomass in the first stage of fermentation. The only reason to aerate the wort when using wet yeast is to provide the yeast with oxygen so that it can produce sterols and unsaturated fatty acids which are important parts of the cell membrane and therefore essential for biomass production.

If the slurry from dry yeast fermentation is re-pitched from one batch of beer to another, the wort has to be aerated as with any liquid yeast.”

Cheers!

 

Thanks, you learn something new every day. I had no idea. Another +1 for US05 vs. the liquid versions.

 

Would you guys still aerate a big beer 12-18 hours after pitching dry yeast?

 

I would probably not before the pitch, but would aerate once at 12-16 hours in.

 

So close and yet so far! It's been so long since we've seen a good, old fashioned dry versus rehydrated flame war, I was starting to feel nostalgic
I use dry for 90+% of my beers and 75+% of those are US-05. I've rehydrated it exactly once, never made a starter (that's counter-productive with dry yeast), and it's never gotten more aeration than what it picks up while splashing it into the fermenter. I've even used it past its 'best by' date. With one exception, it's never let me down (a big DIPA that fermented at 82F was my only yeast related drain pour, and that was my fault). Lag time is typically anywhere from 10 to 24 hours, fermentation is always vigorous, and FG is right where I want it to be. Dry is as easy as it looks. Despite what an awful lot of excellent brewers would have you believe, there's nothing of consequence to be gained by doing anything beyond the package directions.