The pail lasts a lot longer here. Some of my does just attack the blocks and gnaw them to lumps.
Both are vulnerable to chicken attacks, also.
I use both of them after the first freeze until things green up, alternating between pails, goat blocks, horse blocks and deer blocks.
The horse block crumbles the quickest, the deer blocks are the favorite, the pails require the most maintenance: rainwater, ants & poop..
The wide blue pails are good for watering in pens but not very stable to tote around

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If I were able to segregate and feed individually I would not use blocks or pails but having one out allows the back-of-the-pack
goat a way to supplement. I have a doe that you only see at the block or pail in the middle of the night when the rest are sacked out.