Laravel Sum by Value

This is my table :

If I use this :

{{$periode->pakan->sum('jumlah_masuk')}}

The result is "55"

What if I want sum('jumlah_masuk') but only value='s10' from ('Jenis_pakan')?

try the below query,

{{$periode->pakan->where('Jenis_pakan', 's10')->sum('jumlah_masuk')}}