A little confused by the OP. If by a "sow boar", you mean a female wild hog, what happened to the fat you got when you butchered it? Do you not get enough of it?
I learned from my West Virginian G'ma that you ALWAYS save your pork drippings in the kitchen. I pour them into a mason jar and put it in the freezer. It fills up faster than you would think. When it's about full I do a quick render by liquefying it in the microwave and pouring it through a paper cone coffee filter. You will melt a plastic pour-over cone doing this. This is why I have my own cone, Mrs45 won't let me near her fine ceramic one. This tip won't help when making 15lbs of sausage, put it's always been enough for our baking needs. If you do bacon or pork roast in the oven, make sure you have a deep pan under it, a deep pan is easier to pour off without making a mess. You can filter a pan full of oven drippings right out of the oven and skip the middle collection step.
BTW - I render suet and deer tallow as well. Deer tallow renders so pure you can leave it on the shelf like a bar of soap. I use it to lube cast bullets. Mrs has soap making friends who always want more.
Mrs has a M.Ed and says I'm, "Process Oriented"... like a 3 Y.O. Fair enough.
That sounds like the cheapest bear bait anywhere...