What is the explanation of the issue: "The increase of the zakatable amount (nisab) from offspring and profit, their hawl (one-year period for zakat) follows the hawl of their origin," as stated in the jurisprudence of Imam Ahmad ibn Hanbal?

"The passing of a full year (hawl) is a condition for zakat (definition) to be obligatory on acquired wealth (inheritance, gift, etc.), based on the Prophet's (PBUH) saying: 'Whoever acquires wealth, there is no zakat on it until a year passes over it with his Lord.'

As for the offspring of pasturing animals (sa'imah) and trade profits, their hawl is tied to the hawl of their original capital if it reached the nisab (definition); otherwise, it begins when the nisab is completed."