Aubracs are very hardy, nice breed. Normally no such problems.
We think that there is somekind of problem too. Either nutritional, or maybe genetical, because all cattle were bought from abroad and that's not the first time we heard bad experiences with cattle bought this way. Talked with that farmer before. Cattle grazed during summer, brought home in October. Fed hay, minerals and abit of meal. Said to the owner that he better consult with the vet, maybe blood test needed for cows. It's truly very stressful start of farming for those people.