Which animal are used for making products?
Many animals are used in production.
Chickens are used for eggs and meat.
Horses' hooves are used to make gelatin.
Cows and goats are used for meat and milk.
Pigs are used for meat and lard.
Because you have been used to consuming animal products. Once the afore-mentioned products have been removed from your diet, you no longer get the same taste or nutrients. It is very normal to feel strange after removing animal products from your diet, because you are still adapting to the change. Once you get used to it, it's more or less the same as before.