Mu' meneen Brothers and Sisters,
As Salaam Aleikum wa Rahmatullahi wa Barakatuh. (May Allah's Peace, Mercy and Blessings be upon all of you)
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In the name of Allah, We praise Him, seek His help and ask for His forgiveness. Whoever Allah guides none can misguide, and whoever He allows to fall astray, none can guide them aright. We bear witness that there is no one (no idol, no person, no grave, no prophet, no imam, no dai, nobody!) worthy of worship but Allah Alone, and we bear witness that Muhammad(saws) is His slave-servant and the seal of His Messengers.
If the animal is being slaughtered for sacrifice, then the correct dua or supplication to be prayed at this time is: Allah humma hada minka wa lak. Bismillah. Allah o Akbar. (O Allah, this [animal for sacrifice] is from You and for You. In the Name of Allah. Allah is the Greatest.)
It is imperitive that the Bismillah Allah o Akbar is pronounced on each animal that is being slaughtered separately.
It is not permitted that Bismillah Allah o Akbar is said once, and several animals are separately sacrificed.
But if there is such a machine which is invented that it can accommodate the slaughter of several animals at the same time, then there is no harm if the person operating the machine pronounces the Bismillah Allah o Akbar once and several animal are slaughtered simultaneously through that machine.
Whatever written of Truth and benefit is only due to Allahs Assistance and Guidance, and whatever of error is of me. Allah Alone Knows Best and He is the Only Source of Strength.
Your Brother in Islam,