Simon Hart MP has written to the RSPCA to ask why they apparently did not respond to allegations of animal cruelty at Bramble Hall Farm near Pembroke Dock.
"I have had a number of letters and emails from concerned residents who tell me that the reported the farm to the RSPCA and even saw the local inspector at the site, yet it seems no action was taken by the animal charity," explained Mr Hart.
A total of 215 animals were removed from the farm in January following court warrants executed by Pembrokeshire County Council and the Dogs Trust.
Mr Hart has written to RSPCA Chief Executive Chris Sherwood asking how many times Bramble Hall was reported to the charity in 2018 and how many visits were undertaken to the premises by their local inspector during the year.
He added "The RSPCA is usually involved in prosecutions involving companion animals such as dogs and cats, but there is also plenty of evidence of them getting involved in court cases involving farm animals.
"It seems to be a bit of a mystery why the charity apparently took so little action in this instance and I hope to get some answers for their local supporters."