Most of the rice farmers are small farmers. Many of them with less than 20 acres. It means they can produce special varieties of rice and also use the by products of the rice for other things if they have a small portable rice mill for economy of scale.
These small millers can also add a portable stock feed processing machine to use the rice byproducts plus other available products ( tiny shrimps, minnows etc) to make stock feed.
It would be great for others to get together and bootstrap a small machine manufacturing industry. We have need for everything from barbeque grills to the machines above to kilms and pizza ovens.