Passwell Formula One 20kg. Formula One is a low lactose emergency milk formula that can be used for a range of different species including puppies, kittens, lambs, piglets, calves foals, cria, marsupials and zoo animals. Key Features: Formulated from low-lactose ingredients, with an improved nutritional profile than cow’s milk products. High in whey proteins for improved digestibility. Enhanced levels of unsaturated fats including omega-3 & 6 fatty acids. Elevated taurine content – an essential nutrient for the development of carnivores.