A chopper machine that functions as a feeding chopper is often used in agriculture and animal husbandry. The design of this machine is different from a commercial chopper. It is used with a set length of chopped sizes variation in 4 sizes, 1, 3, 5, and 7 cm. Chopped sizes based on the farmer’s requirement to meet standard feeding sizes will impact livestock production. Smaller sizes of feeding, mainly forage (basal feeding) which is easier to digest, will increase feeding efficiency. This research aims to inform farmers about the importance of knowing the forage size for goats that will increase livestock productivity. The 3-5 cm chopped cassava leaf’s optimum size raises milk production from 700 to 1000 ml/day/goat (raising to 42%). This is because the size of the chopped forage makes it easier for the microbial in the goat’s rumen to be digested.