Flax gets slimy from what I read.
I'm going to get a few small squares of high end alfalfa for the chickens this winter. Just put the bale out so they can use it as a jungle gym. You shouldn't have any problems finding non GMO alfalfa.
I ran the #s again and if anyone is wondering how I came up with those #s get your calculator out: (I rounded up my numbers to make it easier)
Fodder is 17% dry matter (DM)
It has 11.8 Mjoule /Kg DM
1 Mj= .25 Mcal
Average maintenance horse needs 25 Mcals/day
1# of seeds "grows" to 6# of fodder.
One more steps says I need 15.7# of seeds to start with.
That's 1/3 of a 50# bag....