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Please do not give high sugar orange juice and include other high vitamin C foods like a slice of peppers or some fresh herbs that are healthier to your guinea pigs. You can find a sample veg and herb diet picture in our diet guide.
If you have access to dog pee free fresh grass, then introduce it gradually into your piggy diet. Green grass is high in vitamin C and the reason why guinea pigs never had the need to make their own. Good quality hay also still contains some. It should make around 80% of the daily food intake. With the correct diet your guinea pigs don't need any extra supplements.
Please take the time to read our very comprehensive but easy to follow diet guide that looks at all food groups in detail: Here is the link: Long Term Balanced General And Special Needs Guinea Pig Diets
Orange pee can be discoloured from veg or fruit they are eating or - more commonly - it leaves the body clear and oxidises when in contact with air to orange and rust shades. That is a very normal process and nothing to worry about.
Is your boy an only piggy or does he have a companion?
Yes, No worries I'm fully aware.. He's on an antibiotic and experiencing loss appetite. I usually give him slice of orange or Oxbow vitamin C tab but he's refusing to eat any of those. So the only option that left for me was feeding him 1/4 squeezed orange.