A culinary enquiry really.... we take our balwens 'off' at 18 months old - always delicious, and still tender (easily cooked pink if desired). This year we also have a zwartbles wether amongst our flock. I haven't thought twice about it really, but it suddenly occurred to me that maybe we've made a mistake. So, have any you kept a zwartbles this long, and if so, was he still tender or more muttony?