Dyfed Powys Police and the FSA will today begin interviewing the three men arrested on suspicion of offences under the fraud act.
The arrests follow a joint operation with the FSA at Farmbox Meats in Aberystwyth and the Peter Boddy Slaughterhouse in Todmorden, West Yorkshire.
Two men aged 64 and 42 were detained at Aberystwyth police station over night and a 63 year old man arrested in Yorkshire has today been transported to Aberystwyth.
Interviews with the three men are likely to continue through the day.
Meanwhile Dyfed Powys Police officers will maintain a presence at the site in Aberystwyth.
More top news
A young boy has been praised for his quick-thinking actions after his mother collapsed at home.
George North has ended speculation over his future by signing a new contract at Northampton.
A man who died from stab wounds in Newport has been named by police.