Insulinaemic and glycaemic responses to three forages in ponies.

•The insulinaemic and glycaemic responses of ponies to soaked hay, dry hay and haylage were compared.•Soaked hay produced the lowest insulinaemic and glycaemic responses to feeding, whilst haylage produced the highest responses.•Insulin-dysregulated ponies had a higher insulinaemic response to all forages than ponies without insulin dysregulation.•The insulinaemic response to feeding hay was reduced after soaking the hay.•Feeding haylage can result in a pronounced insulinaemic response.