Really chill it, instantly, no waiting til you've finished your other chores. I put mine in the bottom of the freezer straightaway, til it's almost developing ice crystals.
Obviously no billies anywhere near.
If these don't help, your goat might need a cobalt supplement.
Ellie's milk tasted odd once, and Doug on here recommended a periodic drench of Formula Co+B12 with selenium. Worked like a dream and a lot more economical than some of the more highly priced 'sprinkle on their food' minerals, plus you know they've had it.