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Kiyisha It's not terribly hard once you get the hang of it - it's really a matter of choosing things that your guineas like/will eat (some 'good' choices, like celery and green beans, are rejected by mine, for example) and feeding things that can cause problems either not at all, if your guineas won't tolerate it, or very sparingly (these include veggies with high Vit A, oxalates, brassicas that can cause gas - brassicas are things like cabbage, broccoli, Wikipedia has a good list). You want to keep the Ca
ratio between 1.33 and 2:1, but 1.33 is ideal, especially if yours are prone to bladder issues - mine is at 1.2:1, which keeps it close and keeps the calcium at a low-ish level. If your guinea pigs have calcium problems, you'll want to pick things from the nutrition chart (
https://www.guineapigcages.com/foru...vy-Nutrition-Charts-amp-Poisonous-Plants-List) that don't have too high of a calcium content (Ca).
Ca
just means a balance between calcium and phosphorus, so, for example, if there are 34 mg of calcium and 34 mg of phosphorus, the ratio would be 1:1, if double the calcium than phosphorus, 2:1, etc.
https://www.guinealynx.info/diet_oxalic.html gives you an idea of things that have high oxalic acid content, you don't want to feed too many foods that have a high amount.
https://www.guinealynx.info/chart.html on this link, there is an Excel calculator where you can input the amount of different types of vegetables in grams and have the Ca
ratio calculated. Generally about 5-10 grams of each vegetable are fed per pig, and a mixture of about 5-7 different kinds, I find is a nice variety for each day. You can just weigh up the food one day and see how much you feed and adjust amounts as necessary. For example, I feed about 90g lettuce (two handfuls) and 60g bell pepper (half a pepper) along with other things each day (I have four guineas). You also want to aim for 10-30 mg of Vit C per kg of guinea daily for good health. The calculator helps you keep an eye on how much calcium and Vit C you're feeding, which is great.
To balance Ca
, if you feed veggies with an inverse or low Ca
ratio (<1:1, for example, 0.5:1), this will bring down your overall ratio. If you feed things with high Ca
(2:1, for example), this will bring up your ratio. Generally speaking, you want about 2-3 'high' foods and 2-3 from the low/inverse range. Anything 1:1 or approximately 1:1 will keep the overall ratio the same. There is no general guidance on the total amount of calcium a guinea pig 'needs' or what is 'too much,' unfortunately, so it's a bit a matter of trial and error. However, GuineaLynx does give a link to nutritional requirements for lab animals, which gives requirements per kg of food, but you'll definitely not be feeding a kg of food to any guinea pig in any day! I just used it as a general guide to calculate how much calcium I'd give compared to that total amount and came under the guideline in order to limit their calcium intake to prevent stones, but still have enough to not cause any calcium deficiencies.
Sorry for the long response, but I hope that's helpful! Please feel free to PM me if you want more info, help, or specifics - I've been spending too much time researching this over the past few months (alongside my actual research for my degree - research is my middle name right now!), so if it helps someone other than me, all the better!