Here's how to use them:
* Feed: This is the most common noun form, referring to the act of feeding or the food given.
* Example: "The farmer gave the cows their morning feed."
* Example: "The baby bird was waiting for its feed."
* Feeding: This form emphasizes the act of providing nourishment.
* Example: "The feeding of the animals takes place at dawn."
* Example: "Breastfeeding is an important part of a baby's development."
Sometimes "feed" is also used as a noun to refer to a specific type of food.
* Example: "Bird feed" is a mixture of seeds for birds.
The best choice depends on the context.