وَالْجَوَامِيسُ وَالْبَقَرُ سَوَاءٌ.
Translation: And buffaloes and cattle are equal in this ruling.
Buffaloes and cattle are equal for this livestock-zakat schedule; buffaloes are not assigned a different starting threshold.
Accordingly, the age-class requirement at 30 and 40 applies to qualifying grazing buffaloes as it does to cattle. Their status as livestock rather than trading stock remains a separate consideration.