It is narrated from Sayyiduna Jabir bin Abdullah (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) said: "There is no harm in the urine of lawful animals."
(b) In another narration: "There is also no harm in the leftover of an animal whose meat is eaten."
Amr bin al-Husayn al-Uqayli and Yahya bin al-Ala al-Razi are both da'if (weak), and Sawwar bin Mus'ab is da'if (weak); so nothing on this is authentic from the Prophet (peace and blessings be upon him).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4148