Asim bin Damrah (may Allah have mercy on him) said that Sayyiduna Ali (may Allah be pleased with him) said: On five camels there is one goat, on ten two goats, on fifteen three goats, on twenty four goats, and on twenty-five five goats. When they exceed that, up to thirty-five there is a bint makhad; then when more, up to forty-five there is a bint labun. Likewise is the zakah of camels up to ninety. When they exceed that, up to one hundred and twenty there are two hiqqahs fit to receive the stud camel. Then when they exceed even that, on every fifty there is a hiqqah and on every forty a bint labun.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7266