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What goes in, must come out. To increase the KG of a Roostr, players must feed them $EGG. As a by-product of this feeding, Roostr digestive systems get to work and create the nutrient-rich $FERT loved by Chikn farmers everywhere. Unlike chikn which always lay $EGG, Roostr must be fed at least 1 $EGG every 24 hours to produce $FERT. This $EGG contributes to the Kg of Roostr.
Squirting $FERT is an important part of the gameplay loop