Pet lambs in a commercial flock are a

nuisance, and unless the person who’s reared them really knows their stuff, they often grade really poorly too.
Until I came on the scene, ex-BH used to palm his off on a neighbour and sell a few to other farmers who had ewes needing lambs. I’d reared 20-plus every year on the moorland farm, so just set to and reared them for him. They were a nuisance in the flock, but we managed, and I did a good job so they mostly got away before Christmas and graded fine. But he did absolutely hate taking them off, particularly any he’d fed himself. He didn’t like taking any lambs in, if truth be told; he’d have much preferred we could sell hogget so they’d have had a bit more life. He’d say they looked at him with such trust, and he knew where they were going...
Funnily enough, I was more okay than him about the lambs going, but really felt that betrayal thing with old ewes. I’d go and set them settled in their pen, go into the ring with them sometimes, and knew that my being there reassured them, but also knew what was ahead of them and that their trust was on this occasion misplaced. Whereas he with old ewes knew it was not a kindness to keep them on through another Cumbrian winter, so taking them in was the right thing to do, and it was easier for him than taking lambs in.