Pasture Grass for my geese

[Pgw]

I realize geese will usually avoid grass that may make them sick but am trying to find a 50# bag of pasture seed mix that I can get going before my babies can forage. Most mixes I have seen all have tall fescue as main seed like 35%. Tractor Supply is supposed to carry 1 for horses that has no fescue but haven't found it. Does anyone know a brand? Thinking I have to make my own? Live in upstate SC. Fescue does well until late summer then dries up from heat. Never tried perrineal rye but too hot for annual.