I would say that feed is a complete no. It contains meat products and other things which aren’t suitable for guinea pigs. For now, try and give them as varied a diet as possible. And hay, more hay and then more hay. In other words hay 24/7 and 50g of veg each a day. Be mindful of veg like spinach, kale and parsley. They’re high in calcium so shouldn’t be fed often. A leaf of Lettuce (not iceberg) can be fed daily, as well as cucumber, bell pepper, green bean and a sprig or two of coriander.