Hadith 5:132
Ghundar narrated to us, from Shu'bah, who said: I asked al-Hakam and Hammad, and they both said: Regarding thirty [cows], a *jadha'* (a one-year-old calf) or a *jadha'ah* (a one-year-old female calf), and regarding forty, a *musinnah* (a two-year-old cow).
حدثنا غندر عن شعبة قال سألت الحكم وحمادا فقالا في ثلاثين جذع أو جذعة وفي أربعين مسنة