I work at a dairy barn and for a year now almost every 2nd holstein that calves will get a twisted stomach within that month after calving. The cows were on this special feed ration that has every nutritional requirement needed by a lactating dairy cow. The dry cows are a ratio that is suppose to prevent twists (same with lactating cows). But it doesn't help. We have had around 15 cows die from this...after the surgery to repair the twist. Nothing seems to be helping. We went off the ration 3 months ago and stayed on the ration to prevent twists. Its hasn't helped out at all. We have had 2 more cows have twists this week. We have had feed analysis done, nutritionists look at the cows and the feed, vet out and cows into the clinic, dead animals taken in for a look at the vet college. But they say the cows are in excellent condition and feed is good. Anyone have any other ideas about what may be causing this. The dairy farm has been in business for many years (like over 30 or more) and have never had this happen till this past year. Any thoughts would be great!!!!