Jug in the fridge just means you get a delayed response on milk temp changes. When I first started I made the mistake of following cold jug advice, and I was constantly overheating my milk. Granted this discussion is about UHT, but I don't think you're really going to gain anything from a cold jug.
People say you gain time for steaming - maybe so, but I'd hazard a guess it's a matter of seconds that you get, plus you're only spending 5 seconds or less introducing air and the rest is rolling it for integration and then getting to your final temperature - and this just takes as long as it takes... Technique is needed, not time.
Definitely ensure cold milk, but I wouldn't be refrigerating the jug. It means that when you forget to refrigerate the jug you're going to struggle as things aren't as you're used to.
People say you gain time for steaming - maybe so, but I'd hazard a guess it's a matter of seconds that you get, plus you're only spending 5 seconds or less introducing air and the rest is rolling it for integration and then getting to your final temperature - and this just takes as long as it takes... Technique is needed, not time.
Definitely ensure cold milk, but I wouldn't be refrigerating the jug. It means that when you forget to refrigerate the jug you're going to struggle as things aren't as you're used to.

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