What is the ruling on paying the zakah of livestock in cash?

The Shaykh : He says: What is the ruling on paying the zakah of livestock in cash, given that the zakah collectors take it in cash and set a minimum threshold (nisab) for it? For sheep, it is two hundred and fifty riyals, meaning the value of a sheep. Yes, and the threshold for goats is one hundred and eighty riyals. Is this correct? This is correct, unless we know that they have undervalued it and that the sheep are worth more than two hundred and fifty. In that case, he pays the difference. For example, if they estimate it at two hundred and fifty but it is worth three hundred, he gives them two hundred and fifty and pays out fifty. If the goats are worth two hundred but the threshold is one hundred and eighty, he gives them one hundred and eighty and pays out twenty. Hmm? No, they are taking it, because this is how everyone does it; he gives them what they ask for.