。
Give them enough food every day.
Literal
Every-day those [topic-は] sufficient only [possessive-の] feed [object-を] give [command-なさい].
The grammar is awkward — それらは topicalizes the animals with は, but やる ('give to animals/inferiors') expects the recipient marked with に, not は. Natural Japanese would say それらに十分なえさを毎日やりなさい. This reads as a translation artifact.