It is narrated from Sayyiduna Abu Darda (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) sacrificed two rams; both were of the age of Jadh'a and castrated.
Hadith Takhrij«اسناده ضعيف، الحجاج بن ارطاة مدلس وقد عنعن، ويعلي بن النعمان في عداد المجھولين ، (انظر مسند أحمد ترقيم الرسالة: 21714 ترقیم بيت الأفكار الدولية: 22057»
Brief Explanation
Benefits: … Although an animal being castrated is indeed a defect, in the context of sacrifice (qurbani), this defect is not considered valid.