Henrietta23 said:
Thanks, I'll look for more posts on it there. I thought I had read that alfalfa could cause urinary calculi in males but now I'm not sure. We still don't have a hay source lined up so we'll have to see what's available here anyway. And I should ask the vet what he is feeding.
Generally speaking, it's phosphorus that causes problems in males.. Blood phosphates, to be more specific. Extra phosphates are filtered out by the kidneys and sent into the bladder.
Grains of pretty much any kind are PACKED FULL of phosphorus.
If the urine pH is too high (too base/not acidic enough), and/or the buck isn't drinking enough water and/or there's just a ton of phosphate in the urine, it can -- and will -- combine with ammonia and magnesium, then precipitate out into crystals of "MAP" stones...magnesium ammonium phosphate. Also known as struvite stones..
In the vast majority of cases, MAP/struvite is what urinary calculi is made of.
Now...blood calcium levels and blood phosphate levels are generally
inverse; higher blood calcium means lower blood phosphate, which is a good thing. Lower blood calcium means higher blood phosphate -- not a good thing at all.
What apparently happens is that the gut only allows considerable "extra" phosphate into the bloodstream when blood calcium is
low....not sure precisely how that works, but I know it's something along those lines. I had a conversation with a vet about this very subject just the other day and she said, straight up, that micro- and macro-nutrient absorption, mineral interplay, and metabolic processes of rumenants is really some of the most difficult chemistry to begin to try to understand.
I believed her, and let it go at that. I got the impression it wasn't so much that she didn't think I could "get it," but more like a white flag of surrender to my incessant questions on the subject.
Anyway, the bottom line is that the blood calcium/phosphate balance can be manipulated intentionally by making sure the animal's blood calcium levels stay up...which means feeding extra calcium...which is why proper goat feed is formulated to have at least a 2:1 Calcium

hosphorus ratio..
Most alfalfa hay is about 6:1, Ca

..
So...if you want your male goat's blood calcium levels to be up to help prevent urinary calculi, feeding legume or legume-mix hay (alfalfa, clover, lespedeza) is a good thing..
Or...there are always alfalfa pellets, which is what we feed our bucks in place of grain. The alfalfa pellets allow us to supplement their diet with a safe, consistent source of protein in combination with feeding el-cheapo grass hay....with which they are VERY wasteful.
It's probably also worth noting that, of all the grasses, timothy and coastal bermuda seem to have the most favorable Ca

ratios. Which is why I fricken LOVE finding clover/timothy mix hay being sold at grass-mix prices..
