I previously fed my guinea pigs Burgess Excel Guinea Pig Nuggets with Mint, which they absolutely loved. However, I noticed the high calcium content in the Burgess nuggets was causing them to excrete excess calcium, leading to milky urine. To address this, I switched to Science Selective Guinea Pig pellets, which have a lower calcium content. While my guinea pigs aren't as enthusiastic about the Science Selective pellets, the change has completely resolved the issue of excess calcium in their systems. Additionally, Science Selective offers a broader range of nutritional benefits compared to Burgess.