Ruling on combining some livestock with others to complete the nisab

Q: A man has a number of different types of livestock, but no single type reaches the nisab on its own. Is there any zakah due on them? If so, how does he pay it?

A: Livestock, such as camels, cattle, and sheep, have known nisabs. Zakah is not obligatory in them until they reach these thresholds, provided that the conditions are met, one of which is that the camels, cattle, and sheep are grazing, meaning they graze for the entire lunar year or most of it. If the nisab for camels, cattle, or sheep is not reached, there is no zakah on them, and one type is not combined with another. For example, if a person has three camels for personal use, twenty sheep for personal use, and twenty cattle for personal use, he does not combine them, because each type has not reached the nisab.
However, if they are for trade, some are combined with others, because in the situation described, they are considered trade goods. They are subject to zakah as trade goods, just as the scholars have stated, and the evidence for this is clear to anyone who reflects on it.