As for feeding male goats...
First of all, make sure your grain is labelled for goats and has at least twice as much calcium as phosphorus. The 2:1 ratio is critical for males, as it helps prevent urinary calculi. Urinary calculi is where magnesium ammonium phosphate crystals form in the bladder and block the urethra, most commonly leading to a ruptured bladder and slow, painful death. I think urinary calculi may be what Barnyard is referring to as kidney stones, but I dunno..
Second...go easy on the grain for males, even if it is 2:1, Ca

. I had a buckling develop UC despite the fact that his grain was properly balanced. It turned out he was eating all his, then half the other buckling's serving, then laying down until the next meal was served instead of grazing or browsing or eating hay (consuming forage makes lots of saliva, which uses up phosphorus, which is good)... We saved him, but he'll never be "right." Bottom line...not so much grain for males, regardless of how properly it's balanced.
Also, I'd recommend pelleted grain for males.. No textured grain or "sweet feed." Reason being, textured feed allows the goat an opportunity to cherry pick the feed. Perhaps they really like the corn, so they pick around and eat lots of that....well, that throws the entire balance off. Corn --
like most grains! -- is very, very high in phosphorus and has almost no calcium, so eating too much corn can lead to UC. And corn's not the only thing they could cherry pick and get too much phosphorus, either...I'm just using it as an example. Pelleted feed, on the other hand, is balanced in each pellet. There's no cherry picking pelleted feed.
On to hay... Alfalfa has a lot of calcium and protein in it, and not so much phosphorus. Grass has a lot of phosphorus, and not so much calcium or protein.. Calcium allows the body to absorb phosphorus, instead of just sending it on out through the urine where it can reach saturation levels and crystalize with magnesium and ammonia to form UC.. That's why alfalfa/grass mix hay works so well for goats....the calcium in the alfalfa offsets the phosphorus in the grass, and the grass provides bulk, brings the overall protein content down to that seemingly magical 16% range, and makes it a little cheaper to buy..
I also know folks who feed straight alfalfa to males to dovetail the feeding of huge amounts of grain.. Only straight alfalfa will due if you're planning to feed lots of grain, because alfalfa's the only thing that's got half a chance of containing sufficient calcium to help offset the huge quantities of phosphorus in the grain..
What seems to be working for us recently is feeding the boys a cheaper grassy hay, and instead of supplementing with goat-labeled grain, we're using 17% gauranteed protein alfalfa pellets. A bag of pellets costs twice as much as an equal quantity of straight alfalfa hay by weight, but they're 100% efficient with the pellets. Zero wastage.. We could, of course, have started using more expensive straight-alfalfa or alfalfa-mix hay to incorporate more calcium, then fed the cheaper goat-labelled grain to supplement, but goats use more hay than grain. As such, being able to continue feeding cheaper hay has turned out to make the whole endeavor cheaper overall.. Plus we don't have to keep two stores of hay, which is nice.. All I have to do differently is pick up a bag of alfalfa pellets from time to time and feed that instead of grain.
I'm certainly not saying grass hay and alfalfa pellets are THE WAY to go or anything like that, and it's not something I've heard of a lot of folks doing...but it made sense to us, so we tried it, we've been doing it a little while now, and our little UC guy so far hasn't plugged up again.. We think it's a winning combo, but as with most things...YMMV.