How is zakat paid on camels that were bought lean and sick, then fattened and multiplied, knowing that some of them have not yet completed a year?

If camels graze in the desert for more than half a year, zakat (definition) becomes obligatory on them, even if they are fed for the remainder of the period. Young camels are added to adult camels for zakat calculation, and their zakat year follows that of their mothers. If the total number of camels is 82, then two Bint Labun are due.