calcium needs

Hi, Please can you help as I’m becoming a bit calcium obsessed. Our guinea pigs have white pee at the moment. They’re not in pain it’s just white and this is a bit of a new thing. I’m pretty sure the hay isn’t alfalfa but am checking. I’m trying to reduce the green leafy veg that is high in...

When they say your pigs diet should be 0.3% calcium does that mean 0.3% of the calories they consume? Or 0.3% of the food they consume in grams/ kilos? This site: https://www.nap.edu/read/4758/chapter/6 Says 8 grams of calcium per kilo of feed. But if you calculate for how much a pig eats in...