Is the amount on which zakat is obligatory based on the principal amount invested in a poultry farm project, or on the profits generated from it that are used for daily expenses?

Zakat (definition) is obligatory on a poultry farming and sales project because it falls under trade Zakat. The poultry and eggs prepared for sale are appraised at their selling price at the end of the Hawl (Zakat year), and Zakat is paid at a rate of 2.5% of their value. The Hawl begins from the date of possessing the nisab (definition) (minimum threshold) of money with which the project was established. Profits are subject to Zakat along with the original capital of the project if they remain until the end of the Hawl. As for what is spent from them before the Hawl ends, there is no Zakat on it. Zakat is not obligatory on the equipment and machinery used in the project.