Needs of a farrowing piggery and a fattening one

[ongito]

hi, im new here and im quite interested in starting my own hog farm, i've learned so much from reading this forum, and still haven't fully grasped the idea of how to start one, can anyone guide me accordingly on the housing needs for farrowing method and the fattening? do i need to build seperate pens for each hog i have?

[nemo]

gilts and sows are housed separately but fatteners are  housed in groups naman