Make sure they don't go out when it's dewy in the morning, llet them go to they're grazing when the sun is high, wet grass can increase chance of bloat too. Make sure they're drinking plenty of fresh wate though before you cut feed, watch how much they're taking in, change regularly, they can be ultra fussy with water. The morning feed and late bottle is good I think, my rule of thumb. Is never every thing at the same time when they're having everything grass/milk/creep. But most mportantly water. N a nice bit of sweet hay x