Greetings, I'm the manager of a small dairy farm in Medina County. We have overall 23 cattle (12 being milked, 11 are dry cows or heifers) and rely primarily on pasture for feeding them. We have just taken over a field that was previously leased to a row crop farmer. It is currently growing field corn, planted May 25th, and due to a shortage of forage we have decided to graze it after reading this article: https://ohioline.osu.edu/factsheet/anr-11 One concern I have is that of rumen acidosis. Right now the corn seems to be in R3 (soft and plump kernels, milky white juice when I squeeze them), so I assume it is not an immediate concern. I'm using portable electric wire to only give them about 3 days worth at a time to ensure they eat the leaves and stalks down well. I predict it will take at least a month to graze the whole field, so I'm worried it will become too starchy by the time they get to the end. At what point in the corn's maturity should I be concerned about rumen acidosis? Or is there already a significant risk of it? If so, would feeding hay while grazing the mature corn mitigate the risk of acidosis?