The study looked at how different types of farm manure affect earthworm growth and manure production. They tested horse manure, cattle manure, straw cattle manure, and combinations with hen manure. The results showed that horse manure and straw cattle manure led to the highest worm growth. The most worm manure was produced by a mix of horse and hen manure. Overall, 100% horse manure and 100% straw cattle manure were the best for increasing worm growth.