animal feed

Fertilizer runoff is fueling the toxic algae bloom in the Gulf of Mexico. Farmers could help by growing crops in rotation to reduce the need for fertilizer. But it's unclear who will buy them.

Instead of letting food rot, some entrepreneurs want to use it to feed insects, which can then nourish livestock. But federal regulations have been slow to catch up to the growth of insect farms.

Researchers are trying to figure out whether probiotics — the stuff we like to eat in yogurt to keep our guts healthy — could also help pigs, cows and chickens thrive.