There are
feed formula here. You could try this.
Good thing you have a take out counter. Being the one which will buy your own produce your target is too just fatten the animal into a size suitable for your operation. If you want to really push through with 14-16 pig then you need to get 5 piglets per month until you reach 14-16. By doing so you after 5-6 months you could slaughter 5 pigs per month.
If you fatten it using scrap foods it would take 5-6 months to reach around 60-80 kgs.
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if you want to slaughter pig in just 4 months that would weight about 80kgs above, you need to buy commercial feeds.
I have seen some people use commercial feeds in the pre starter stage and starter then when it is time to feed growing feeds they shift to scrap food. This give them good profit although it would take 5 months before they can sell their animal at 80 kgs ave.