A lot goes on behind the closed doors of factory farms.
Here is a family-friendly series of short videos that show the basics of how animals are treated before going to the slaughterhouses:
https://www.youtube.com/watch?v=rEkc70ztOrc
https://www.youtube.com/watch?v=VAN6G8sBNIE
https://www.youtube.com/watch?v=aGK3Rqoeux8
And this video goes into graphic detail:
https://www.youtube.com/watch?v=II2LWxN26hs
All of these videos are educational and worth watching.
The inhumane treatment of farm animals and its effect on the environment and human health need to be stopped with restrictions on how many animals any one farm can be in possession of, based on its size, as well as health standards and laws against mutilation and other horrifying discourtesies shown to the creatures who feed us.