When the number of camels reaches 46, one ḥiqqah (a female camel that has completed three years) is due. It is so named because, at this age, it becomes entitled to be serviced by the male, can carry loads, and may be ridden.
When the camels total 61, one jadhʿah (a female camel that has completed four years) is required. It is called jadhʿah because, on reaching this age, one of its teeth falls out. The proof for the obligation of a jadhʿah at this range is the sound report in which the Messenger of Allah ﷺ said: “When they reach 61 up to 75, a jadhʿah is due,” and there is scholarly consensus on this point.
When the total reaches 76, two bint labūn are due, in accordance with the authentic narration that states: “When they reach 76 up to 90, two bint labūn are due.”
When the camels number 91, two ḥiqqah are obligatory, based on the authentic hadith: “When they reach 91 up to 120, two ḥiqqah that have been serviced by the male are due,” and there is consensus on this ruling.
If the total exceeds 120 by one—that is, reaches 121—three bint labūn are required, according to the hadith on charitable dues written by the Prophet ﷺ, whose wording is: “When they exceed 120, then for every forty a bint labūn and for every fifty a ḥiqqah.”