Some breeds of sheep (lamb) are very lean !

I think sheep has been bred for fatness.

...

My cousin used to keep a flock of "Gotland  sheep"
A traditional "primitive" breed of sheep ,originating from the Swedish
island of Gotland. This breed is primarily kept for the wool.  They are
primitive in the sense that they can thrive on marginal foods , are robust
and only needs little care


The meat was very lean -  almost too lean  - it had little taste compared
to other normal breeds of sheep.  Now my cousin has such sheep instead :-)


Esben