Ablution after such food is not obligatory, nor after drinking camel milk. It is only required to perform Wudhu after eating camel meat, according to the most authorative saying of the scholars, based upon the hadith of the Prophet salallaahu 'alaihi wasallam in which he said:
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"Perform ablution after eating camel meat, and do not perform ablution after eating goat." [At Tirmithi no.21 and Abu Dawud no.184]
Muslim narrated in his Sahih, on the authority of Jabir bin Samurah, may Allah be pleased with him, that a man asked the Prophet salallaahu 'alaihi wasallam:
"Should we make ablution after eating female camel meat?" He said: "Yes" [Muslim no.366].
And broth is not called meat, nor is food (cooked in camel meat) nor camel milk. Such matters are specific and Qiyas cannot be applied to them. And Allah knows best.