When we get meat (chicken), we go to the local (non-Muslim) slaughterhouse/factory and recite the name of Allah over the chickens as a mechanical blade slices their throats. We are not doing it with our own hands but a machine is carrying out the slaughter. The process is so fast that by the time we recite the name of Allah, at least four chickens have gone by. Is this meat lawful for us to eat?
Sheikh `Abd al-Wahhâb al-Turayrî, former professor at al-Imâm University in Riyadh
Slaughtering is valid by means of any sharp tool that causes the blood flow. This would includes such machines as you describe. If this action is taken and Allah’s name is mentioned, then the slaughter is correct and the meat slaughtered in this way is lawful, by the will of Allah.
If some of the animals are slaughtered before the name of Allah could be mentioned on them, then they are also lawful, by the will of Allah.
And Allah knows best.
Source: Islam Today
-- Al Arabiya Digital