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jt43 02-06-2013 08:45 PM

Underpitched yeast
 
Okay, so after doing a little research I realized that I under pitched my yeast by 130,000,000 cells. The brew is on its second day of fermentation and the airlock is very active. Knowing that I under pitched should I make a starter with the same yeast strand ( wyeast northwest ale) and add it to the fermenter?

ktraver97ss 02-06-2013 08:51 PM

Whats your batch size, OG, and yeast strain?

gcdowd 02-06-2013 08:53 PM

Did you mean 130 billion? 130 million is peanuts

ktraver97ss 02-06-2013 08:56 PM

Edit, I see you put the yeast strain in there, oops. What about the gravity? Ill assume you just pitched one pack into a 5g batch.

duboman 02-06-2013 09:01 PM

Quote:

Originally Posted by jt43
Okay, so after doing a little research I realized that I under pitched my yeast by 130,000,000 cells. The brew is on its second day of fermentation and the airlock is very active. Knowing that I under pitched should I make a starter with the same yeast strand ( wyeast northwest ale) and add it to the fermenter?

The cells you pitched already replicated and multiplied during the initial lag phase so really adding more yeast now would be a waste, IMO

MileHiBrewingSupplies 02-06-2013 09:02 PM

You have a couple of reasonable options: Get/grow more yeast and pitch it now or let the current yeast work it's way through fermentation, then asses the situation after 2-3 weeks of fermenting. If it were me, I'd wait to see the results then, if the FG is too high, move the beer to a secondary and re-pitch at that time. Many brewers only pitch one pack of liquid yeast and swear by the results...though pitching sufficient yeast cells will almost always make better beer.

jt43 02-06-2013 10:27 PM

Quote:

Originally Posted by ktraver97ss
Edit, I see you put the yeast strain in there, oops. What about the gravity? Ill assume you just pitched one pack into a 5g batch.

My OG was 1.086 The temp was 68f I pitched two packs of wyeast northwest ale which gave 2 billion yeast cells. They were both smacked threes hours prior being pitched and both pouches swelled like they should. I aerated by pouring the wort back and forth between two sanitized buckets ten times. 7 hours later I started to notice airlock activity.

The FG for this brew is supposed to be 1.010 and my OG was supposed to be 1.072. Don't know why the OG turned out so high.

jt43 02-06-2013 10:30 PM

Quote:

Originally Posted by MileHiBrewingSupplies
You have a couple of reasonable options: Get/grow more yeast and pitch it now or let the current yeast work it's way through fermentation, then asses the situation after 2-3 weeks of fermenting. If it were me, I'd wait to see the results then, if the FG is too high, move the beer to a secondary and re-pitch at that time. Many brewers only pitch one pack of liquid yeast and swear by the results...though pitching sufficient yeast cells will almost always make better beer.

I think I will wait 4 more days then take a gravity reading and assess then. If I did add more yeast how would the lack of oxygen affect the respiration phase?

jt43 02-06-2013 10:33 PM

Quote:

Originally Posted by gcdowd
Did you mean 130 billion? 130 million is peanuts

Yea I meant 130billion left off a few zeros

MileHiBrewingSupplies 02-06-2013 10:40 PM

Since this was a high gravity beer, it's pretty certain that you'll need to pitch more yeast after moving it to a secondary. I'd recommend getting another yeast pack and doing a starter (do you know how to build a starter?). Aerate the starter REALLY well, then pitch at hi-krauesen to your batch. That should provide enough oxygen for the remaining work the new yeast has to do.

Just FYI, big beers like this need a LOT of yeast. One BRAND NEW (just made...) pack of WYEAST contains the POTENTIAL for 100 billion cells. A 1.080 beer needs around 540 billion cells...or 5 new packs. So, it would be a great idea to learn and do a yeast starter!


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