Here is the post where I got the detail of the timings for horse digestion.
linkyBy my reckoning, if she is correct, then you have the following from giving a full haynet to the horse really needing something else, or suffering real damage.
- Eating time (time it takes to eat all the hay in the haynet), say 2-3 hours for a greedy pony with a full net?
- Emptying stomach (from article) 4-6 hours
- Time before starvation kicks in and real damage starts (from article) 4 hours
Therefore, for an ideal scenario, so that the horse is never stressed and hungry, you would give a greedy horse a haynet every 6-9 hours, so that there is no time when the stomach is empty. The timing to avoid physiological damage is 10-13 hours, so that he eats for 2-3 hours, empties his stomach over the next 4-6, and starts to be in danger from starvation a further 4 hours after that.
We are currently doing Davy's bedtime 'net at 10-11pm, and the milking team give him his first 'net in the morning at 8-9am or thereabouts. In addition, I'm now using "
bedderstraw" as part of his bedding, which isn't particularly nice for him to eat but won't harm him, so if he is really anxious and hungry, he can eat a bit of that and it will avoid any damage from acids, and won't cause any damage itself.
Oh, and he now has haynets with the small holes, which slows him down ever so slightly. Watching him tearing the hay from them, I don't expect them to last very long, mind...