Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) says that the Messenger of Allah (peace and blessings be upon him) "forbade hiring out a stud animal for mating."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10851
Sayyiduna Jabir bin Abdullah (may Allah be pleased with them both) says that the Messenger of Allah (peace and blessings be upon him) forbade "the camel's mating, and the sale of water and land on the condition that it be cultivated."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10852
Sayyiduna Anas bin Malik (may Allah be pleased with him) says that a man from Banu Kilab asked the Messenger of Allah (peace and blessings be upon him) about the mating of a stud animal, and he forbade him from it. He said: O Messenger of Allah! We lend out our stud for mating and we are given a gift in return. So he permitted the gift.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10853
Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) says that the Prophet (peace and blessings be upon him) "forbade the sale of a stud's mating," and Ubaydullah added: "and the miller's qafiz (qafiz is a measure)."
(b) Waki' (may Allah have mercy on him) says: "He forbade hiring out a stud animal for mating."
(c) Abd al-Rahman bin Abi Nu'm (may Allah have mercy on him) says that the Messenger of Allah (peace and blessings be upon him) "forbade (it)."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10854