Who owns the offspring resulting from breeding a usurped male animal with a free female animal?

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If a male animal (*fahl*) is usurped and then used to breed with a female animal belonging to the rightful owner, the offspring belongs to the owner of the female animal because lineage follows the dam. The usurper is not entitled to any fee for the service because the Prophet, peace be upon him, prohibited compensation for the stud service (*'asb al-fahl*).