The Messenger of Allah ﷺ forbade taking payment for the stud services of a male animal.
نهي رسول الله ﷺ عن عسب الفحل.
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Nasai (4674), Daraqutni (4713), and Bayhaqi (5/339) all narrated it through the route of Sufyan, from Hisham, from Ibn Abu Nuaim, from Abu Saeed Khudri, who related it. Its chain is hasan because of Hisham, who is Ibn Aaidh Asadi, Abu Kulayb Kufi. Ahmad, Ibn Main, Abu Dawud, and Ajli all deemed him reliable, but Abu Hatim said, "A sheikh." That is why Ibn Hajar placed him at the rank of "truthful."Dhahabi assumed that he was a different Hisham Abu Kulayb, not Ibn Aaidh, and so entered him in Al-Mizan, saying, "His hadith is objectionable, and the one who narrates from him is unknown." Yet he himself mentioned among his teachers Ibn Abu Nuaim, and among those who narrated from him Sufyan Thawri. In Al-Kashif, he said of him, "Reliable." Ibn Hajar followed him in this, entering him into Lisan Mizan, without correcting Dhahabi's mistake, even though he is among the men of Al-Tahdhib, and Ibn Hajar said of him in Al-Taqrib, "Truthful."On this subject there is also what has been narrated from Ali bin Abu Talib, from the Prophet ﷺ, that he forbade the stud fee, in a lengthy hadith. Ahmad (1254) and Abu Yaala (357) both narrated it through the hadith of Hasan bin Zakwan, from Habib bin Abu Thabit, from Asim bin Damra, from Ali, who related it.Hasan bin Zakwan, Abu Salama Basri, is daif. Ibn Main, Abu Hatim, Nasai, and others declared him daif. Moreover, Hasan bin Zakwan did not hear this hadith directly from Habib bin Abu Thabit, there is Amr bin Khalid between them, and he is one whose hadith is abandoned, as Ibn Adi stated in Al-Kamil (5/1776), except that Hasan bin Zakwan dropped him from the chain due to the severity of his weakness.His statement, "the stud fee," refers to the payment charged for the male animal's fluid, whether it be a horse, a camel, or a billy goat. Taking payment for it is forbidden due to its baseness, and this is the view held by a group of the companions and most jurists.It has also been said that the reason for prohibiting payment for the stud's fluid, which amounts to a fee for the act of mating, lies in the uncertainty and risk involved, since the male may or may not successfully mate, and the female may or may not conceive as a result.As for lending out the stud animal, this is recommended, and it is established in the sahih collections, "Among the rights owed regarding camels is the lending out of their stud." In another wording, "the offering of their stud." Muslim (988) narrated it.