I think some people mistakenly think lamb, deer, and other similar ruminants are leaner than they actually are because many times their fat is discarded. That is a shame. I think you should at least taste an animal's fat before discarding it. Ruminants do tend to convert things to fat less gracefully than pigs do. Lard is nearly always tasty until a pig has been fed something truly horrible. Tallow and other ruminant fats can be a lot more variable.