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http://www.premier1supplies.com/img/instruction/89.pdf
t-posts serve only to hold your wire in line and do not have the mass to resist much pressure put on them. They'll just bend over if a cow charges into one if startled.
An offset wire works wonders for the climbing types... and of course keeps the cows from leaning on the fence, too.
I don't reommend t-posts; but sometimes it's all you can afford. If you can alternate wood post with t-post every 10', it's probably a good compromise.
The "goat" woven wire comes in a lot of different heights and grid sizes. You'll notice on them that the openings are smaller towards the bottom. They also come in strange heights, since they are most commonly used with a high tensile hotwire along the top. The 330' rolls come in 39", 26"...
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I think people are confusing welded wire with woven wire. Welded wire is really not suitable for large areas. Perhaps for working facilities & corrals you can make the argument. But as far as a per LF basis goes, woven wire compares well.
Going all high tensile will be the cheapest...
Assuming you can't pour cast in place walls about 16' high, which have only the potential to deter goats, then I suggest:
39" woven wire
3-4" dia wood posts at 10' OC
1 strand high tensile wire, electrified, at 48"
4-5" dia posts for all corner braces
then as big as you can afford for the gate...