You have a few options:
Deer:
A. For the deer issue, you could build a really high
fence, like 8 feet of woven wire, but then posts and fencing would be really expensive. It is probably your best option, but again, the most expensive.
B. Another option would be to install 6 foot woven wire with a few strands of high tensile or barbless cable to prevent jumping from the 6 foot mark to the 8 foot mar,. Its not as epensive as option A, but it would be expensive still
C. You could put up (2) four foot fences. A deer can easily bound over a 4 foot fence...but not from a standing start. It needs some room to take off, and more importantly a place to
land. If you put a second fence within that first fence by 10 feet, you eliminate the deer's landing zone and thus keep them out. They say this is very effective. It would not have to be 4 feet, you could get by with 32 inch woven wire, or just barbless cable, allowing your sheep and pigs to wonder in between the two fences.
Sheep: In my
experience I have tried a lot of fences and only woven wire has really worked. There is no electricity to fuss with; just put fence posts in, you
staple up woven wire, you forget it is up for the next 30 years. Deducted over that length of time, it is VERY cheap fence. My attempts at electronet were having them run straight through it. The same for sapling, high tensile and other fences. Considering the high cost if they get out, a sheep fence that keeps them in is a very sound investment.
Pigs:
They won't go through woven wire anyway, but putting up cheap stand-out insulators on your posts, with one or two wires at pig height connected to a good energizer will stop them all the more since they do not have wool like sheep.
Recommendation:
Perimeter fence 4 feet high, wooden fence posts, well braced corners with 48 inch woven wire set 2 inches off the ground. Place off set insulators on these posts with electrical wire set at pig height; one or two strands as finances allow, to a 10 mile energizer (25 mile if you have some extra money)
10 feet inside of that (but a space so sheep and pigs can get between the two fences and graze, place electronet fencing. The white sort of reflects moonlight so deer see it and realize there is no landing zone and stay out.