The Nisab for cattle is thirty.
Zakat is not obligatory on less than thirty cattle.
For thirty cattle, a one-year-old calf is required.
This applies up to 39 cattle.
For 40 to 59 cattle, a two-year-old calf is required.
For 60 to 69 cattle, two one-year old calves are required.
For 70 cattle one one year old calf, and one two year old calf is required.
For separate calculation of zakat on all livestock, please visit our Livestock Zakat Calculator