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Again it's going to be CWF certification that you want to look for, specifically producers whose dairy calves go to someone with "Good Calf Commendation" status. Unfortunately the nature of dairy farming pretty much means the separation of calves from mothers, as @Well_is_it said, of which the male calves will likely go for raising as veal - hence the best you can do within this system is ensure that these animals have the best possible lives.
The only other way is to keep your own cow! Even then the usual way it's done is to milk the cow and then feed the calf yourself, otherwise the calf will beat you to it every time...
Having grown up with cows literally looking over the garden wall (and getting into the garden itself occasionally) I personally find it very difficult to deal with the way these placid and usually friendly animals have to live.
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Try explaining that they have been selectively bred over millennia to be docile and cool with it. Importantly they wouldn't be alive if they didn't produce milk.
We buy organic milk (and not too much) as it seems to offer a marginally better quality of life for them. But then still consume a lot of cheese and butter as my other half is a veggie and the reality is having a balanced diet with no meat or dairy is hard.
If it's just tea milk then she's just got to take a view. Or if she has sugar in her tea (shudders) then try cashew.
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Not sure where you are based but I've had very good milk from this farm which is relatively local to me.
A relevant question that I've been struggling with.
My girlfriend isn't keen on milk production, in particular the aspect of the calves being taken away from the mothers straightaway. Are there any "ethical" milk producers, free-range, calves remaining with the mother, etc (and the same question for cheese). Searching found a few in the US and one over here that seems to have a giant waiting list.
She's moved onto alternatives to dairy for cereal, etc but still wants real milk to go in tea.