Srimate Raamnujaye Namaha,
Swami has explained about the challenges of having desi cows in these days in todays audio 2321.
As a start those of us who are fortunate to live near a place where cows are there, we can save our fruit and vegetable peels etc. and can feed the cows(either stray cows or in the place where we procure milk) .this can be a small act but when done in large numbers may help.
Ideally for a sustainable way, cows and farmlands were integrated , where cows feed on the agricultural waste or graze in empty lands and make the soil fertile by cow dung. Nowadays cows in cities need to be fed by fodder which is quiet expensive and makes it unsustainable.
another challenge faced is the costly and complex allopathc treatment for cows, heard that there are some good homeopathic remedies and doctors who have simple and cheap solutions for most problems.