As far as I know Srila Prabhupada readily accepted milk from all breeds of cows. But, some spiritual teachers say only indigenous indian cow breeds are go–mata. Foreign breeds are from Raksasas. Is this correct? If so should we not rear and drink milk of foreign breeds?
There is the emergence of genetic modification of seeds in the last few years and hybrid seeds are the only varieties mostly being used by farmers. However, if we have access to native seeds that was given by nature then definitely that is purer and safe as we know that nature always punishes human tinkering with natural mechanisms.
The same analogy holds good for cows as well. However, we cannot and should not call cows as rakshasas or putanas. They are just innocent cows. We have to make a selective choice based on time, place and situations as Srila Prabhupada expertly did.