Never on repeat, the script does not run if set on repeat.
Once a season should be fine. Just see if they are hunry or not.
Yes, you make a pasture.
No seeds, but they haycrate has a 66% chance of being preserved. You can use it multiple times.
Thats the reason I don´t even try to get grazers, even the stables helps a lot about the grazing underground livestock, I find it not of my tastes checking all the time about grazing manually, and I have a chance to lose all my seeds (66% to keep the create is pretty cool).
Even with the possibility to store a lot of seed from my booze and cooking, in some point you don´t go cooking or do more booze (I use workflow management as a lot of people), but when my first try of use the stable I get disappointed when I lose all my seeds (because I was assuming than make hay give you seeds).
If someone knows how to create a "timer" like way to feed grazers without getting risk to lose all your seeds. Share with us please.
The only way I can think right now is using tons of science:
1. take time when the grazers needs food.
2. Create a complicated timing system by using computing.
http://dwarffortresswiki.org/index.php/DF2012:Mechanical_logic3. The computer is linked to a closed room with "Feed Grazers with Hay" on repeat. (No one can enter because the computer keeps the door closed)
4. The door will be opened when the grazers are hungry, because the computer has the timing in memory.
5. The computer will have a unkeep till the doors get closed again and the cycles continues.
This is the theory, but in practice have a lot of posible issues, like:
The science involved here, is overwhelming, just try to create a computer by reading the Wiki article, creating logical circuits.
If you are not careful for all possible thing than could make this system fails because of the variables like:
-If you have a lot of grazer pastures, your workers should do this task in the time the doors are open, if they don´t the grazers will starve to death.
-The workers can be hindered to haul the hay in some cases like, tantrums, a mob than sneak inside the fortress, sleeping, parties, eating, resting time, your worker is a lazy bum, your worker feels like a jackass and he don´t want to work in that moment.
And other possible fun you can get in those moments, make this option like a bit unpractical.