Chumrah of the [shmitta] Year

I've never heard of this chumrah before...

hattip Gilad Field

the chumrah is that the cows ate during Pesach "sefichin" - produce that is prohibited during shmitta - and therefore drinking milk from regular dairy cows is a problem. The sign offers anyone who wants to obtain milk from cows that have only eaten produce planted before this past Rosh Hashana and was harvested properly, should call...
I don't know why they don't just give the cows yevul nochri...
aren't the cows eating grass and hay anyway? what produce do they eat? I had n idea that cows are being given sefichin to eat, and I have no idea if that is a problem or not, let alone a problem with the milk that cow produces...
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