Does sauerkraut go bad

In general, slimy brine is indicative of a fermentation problem. Your brine might be too weak (what concentration did you use?), it may be too warm, your brine might not cover the vegetables, there might be some air bubbles trapped in your ferment.

This article suggests that in the early days of sauerkraut fermentation, the concentration of slime forming bacteria - Leuconostoc - is relatively high and towards the end of fermentation it's too small to measure. It doesn't say anything about slimy brine, but it's possible that the brine is temporarily slimy in the early days of fermentation and as the acidity increases it dissipates. I've never checked a ferment this early, so I can't comment on it.

Personally, I would let it continue to ferment for a week or two and then see whether the perceived sliminess has dissipated or increased. It's possible that it's too early to tell. Slimy vegetables, without a doubt, should be discarded.

References

• http://www.culturesforhealth.com/fermented-vegetables-troubleshooting-guide

Grass-fed beef does certainly smell different from corn-fed beef. I haven't noticed it smelling "sweeter", but it could smell gamey, earthy, or even sulfuric if the cow got in to some wild onions or garlic. And there's plenty of variation between different types of grass and even the same grass variety from season to season.

Corn-fed beef is not going to have that because, well, there isn't much variation in animal feed corn.

Rotten meat has a distinctive smell and it's going to be the same smell in grass-fed beef.