It is narrated from Sayyiduna Amr bin Shu'aib (may Allah have mercy on him) that Sayyiduna Umar bin Khattab (may Allah be pleased with him) said regarding blood money: "Blood money will be taken from the owners of goats in the form of goats."
Hadith Referenceالسنن المأثورة / باب أيام التشريق / 391
Hadith Takhrijمصنف عبدالرزاق: 290/9، السنن الكبرى للبيهقي: 77/8، مسند الشافعي منقطع لكن وصله البيهقي في السنن الكبرى: 80/8۔