The police on Tuesday arrested the main suspect in a case of alleged cow slaughter in Govindgarh in Alwar district.
Shakil Qureshi (24) was the fourth person arrested in the case, Govindgarh station house officer Dara Singh said.
His wife, mother and sister-in-law were arrested on Tuesday with about 40 kilos of meat, suspected to be beef.
The police said they had raided a house after a tip off that a cow had been slaughtered and found the women packaging the meat.
A veterinarian's report said the meat was beef and its samples were sent to forensic experts for further confirmation, police said.