Photos provided to the ABC by the head of an animal rescue organisation show dead horses and others that appear to be in a severely underfed state on a property west of Toowoomba.
It is understood up to 32 horses have died at the property.
Warning: This story contains images some people may find distressing.
The founder of Australian Farm Animal Rescue Matters (AFARM) Marjorie Pagani said the Department of Agriculture and Fisheries (DAF) was alerted to the horses' condition, but more needed to be done.
"Sadly nothing has happened except their continued starvation," Ms Pagani said.
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Article written by: George Roberts