Essential fatty acids (like omega 3 and omega 6 fatty acids) and fat soluble vitamins (Vitamin A, Vitamin E, Vitamin, D, Vitamin K). The plain fat is a nutrient too.
Kittens, generally, can begin to use a litter box at about four weeks of age, and a kitten being raised without its mother or adult cat will take slightly longer to litter train; so, keep this in mind when you begin the task of litter training your kitten. - Place the kitten in the box 1/2 hour after play or meals.
Because the time when the kitten is taken home, itâs already past when litter training is best started. That is, kittens are normally brought home at age of 10 to 12 weeks (unless it comes from a terrible breeder, or itâs a rescue kitten). However, litter training should be started somewhat close to four weeks of age.