“I hope you’re both ready for the cost, and have a nice deep-freeze.”
It’s either that or lose your squeamishness over picking up roadkill, hopefully relatively fresh. There’s also having another bird farm for pigeons or collecting them from city parks.
Roadkill isn’t very good for them; most hawks are not routine scavengers and eat a varied diet. A steady diet of pigeons wouldn’t be good for them, either.
People who have these birds pay very good money to have a constant supply of quality food, often weanling rats, mice, day-old chicks, etc., that have been raised nutritiously, killed and frozen.
https://www.rodentpro.com/categories/frozen-foods/rats