It is narrated from Sayyiduna Samurah al-Suwa'i (may Allah be pleased with him); he said: I asked the Messenger of Allah (peace and blessings be upon him), saying: "We are people of the desert and of livestock; should we perform ablution (wudu) after eating camel meat and drinking its milk?" He (peace and blessings be upon him) said: "Yes." I said: "Should we perform ablution after eating the meat of sheep and goats and drinking their milk?" He (peace and blessings be upon him) said: "No."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 7075