fat replacer
olestra
Yes
Milk replacer. It comes in a powdered form that you can buy at your local feed store that you have to measure out and mix with water. Don't buy any plant-based milk replacer like soy as this will be detrimental to your calf's health: soy contains low to zero saturated fat which is not healthy for a baby calf, plus also contains some other things (forget what) that will cause him to get sick. So either stick with the milk replacer formula, or get some unpasteurized cows or goats milk for him to suckle on.
explain with help of an example, how FAT is different from inode.
Please follow the label on the milk replacer you purchased. You will need to use the guidelines on the milk replacer formula label to determine how much is needed per unit of body weight of your calves.
They have to be bottle fed milk replacer that is specially made for them. Milk replacer usually comes in a powder formula which is mixed with water and given to the calf accordingly. However, milk replacer doesn't need to be given to the orphaned calf if the owner has a cow that can be used as a surrogate mother for the calf.
Fat
Vegatable oil
Straight, unpasteurized milk from a cow, or powdered milk that is derived from unpasteurized milk (see your local large animal vet for the best milk replacer, as brands are sometimes different between countries/states/provinces, but basically are the same). NO SOY MILK REPLACER OR ANY MILK REPLACE THAT COMES FROM PLANT-BASED "MILK." Soy replacer is bad for calves because it doesn't contain the same amount of fats, proteins and calcium, among other nutrients, that is in cow's milk. You will kill your calf faster if you feed plant-based "milk" replacer than if you feed the real milk-based replacer.
If you are talking about hand raising baby rabbits, your best bet is kitten replacer milk (you can buy it at most any pet store) or goats milk (canned). Cows milk does not have enough fat in it especially if it is processed.
animal fat.