'Abdullah bin Umar (may Allah be pleased with them) reports that the Prophet Muhammad (peace and blessings of Allah be upon him) forbade taking a fee for letting a male animal mate with a female. __QUR_N__ Imam Tirmidhi says: 1- The hadith of Ibn Umar (may Allah be pleased with them) is Hasan Sahih, 2- In this chapter, hadiths have also been narrated from Abu Hurairah, Anas, and Abu Sa'id (may Allah be pleased with them), 3- Some people of knowledge act upon this. Some scholars have permitted accepting a gift for this work, but according to the majority, this prohibition is one of forbiddance.
Hadith Referenceسنن ترمذي / كتاب البيوع عن رسول الله صلى الله عليه وسلم / 1273
Anas bin Malik (may Allah be pleased with him) narrates that a man from the tribe of Kilab asked the Prophet (peace and blessings of Allah be upon him) about taking a fee for letting a male animal mate with a female. The Prophet forbade him from doing so. Then the man said: "O Messenger of Allah! We let the male mate with the female and we are given a gift (in return), so what is the ruling on that?" The Prophet permitted him to accept the gift.