He was asked:
About a man who acquired a camel, which then gave birth to a calf. Is there any concession regarding its offspring in the four schools of law?
He replied:
An animal’s offspring belongs to its owner and is not lawful for the usurper. However, if the offspring resulted from the efforts of the person who took possession, some scholars hold that the increase should be shared between the owner and the person who did the work, as in a profit-sharing partnership and similar arrangements. And Allah knows best.
He was asked:
About a man who lawfully owns livestock and has them covered by a stud unlawfully in his possession. Is there any doubt concerning the lawfulness of their offspring?
He replied:
If he has his livestock covered by someone else’s stud, the offspring belongs to him. However, if he wrongfully uses the stud for breeding in a way that harms it, he must compensate its owner for any diminution in its value. If he does not know its owner, he must give the equivalent of that diminution in charity. But if his use does not harm the stud, no payment is due for its use, for:
“The Prophet, may Allah bless him and grant him peace, forbade charging stud fees.”
And Allah knows best.