A plant for the treatment of whole muscle meat including a brine injection apparatus integrating • a conveyor device of whole muscle meat defining a conveying direction, and a conveying surface on which said whole muscle meat is to be placed; • three injector heads successive in the conveying direction, each provided with a plurality of injector needles parallel to one another and orthogonal to said conveying surface, wherein each injector head is movable in a direction orthogonal to the conveying surface between an injection position and a standby position away from the conveying surface, and wherein each of said injector needles is hollow and is connected to a pressurized brine supply device; characterized in that • one injector head, constituting a stand-alone injector head, is connected to a first pressurized brine supply device, being independent from the remaining injector heads which constitute two linked injector heads which are connected to an at least partially shared second pressurized brine supply device, and wherein said two linked injector heads reach the injection position at alternating times; • the conveyor device has at least two segments (10a and 10b) independently operated, the conveying surface of each of said segments (10a and 10b) facing one of said two linked injector heads; • said plant also integrates at least one massage application apparatus including a rotary drum suitable for being loaded with the whole muscle meat after it has gone through the injection apparatus said rotary drum having an inner face with a maximum inner diameter comprised between 140 cm and 210 cm and being operated by a motor making it rotate at between 14 and 20 revolutions per minute; such that the brine injection occurring in the injection apparatus and the turning occurring in the massage application apparatus allow increasing the weight of the whole muscle meat, with respect to the initial weight before it goes through the plant, by up to more than 220% by means of brine absorption. • a conveyor device of whole muscle meat defining a conveying direction, and a conveying surface on which said whole muscle meat is to be placed; • three injector heads successive in the conveying direction, each provided with a plurality of injector needles parallel to one another and orthogonal to said conveying surface, wherein each injector head is movable in a direction orthogonal to the conveying surface between an injection position and a standby position away from the conveying surface, and wherein each of said injector needles is hollow and is connected to a pressurized brine supply device; • one injector head, constituting a stand-alone injector head, is connected to a first pressurized brine supply device, being independent from the remaining injector heads which constitute two linked injector heads which are connected to an at least partially shared second pressurized brine supply device, and wherein said two linked injector heads reach the injection position at alternating times; • the conveyor device has at least two segments (10a and 10b) independently operated, the conveying surface of each of said segments (10a and 10b) facing one of said two linked injector heads; • said plant also integrates at least one massage application apparatus including a rotary drum suitable for being loaded with the whole muscle meat after it has gone through the injection apparatus said rotary drum having an inner face with a maximum inner diameter comprised between 140 cm and 210 cm and being operated by a motor making it rotate at between 14 and 20 revolutions per minute;