Quote: I'm also far more interested in behavior, genetic interplay, and hardiness than maintaining different breeds, so I get that.
Good to hear the geese are doing well.
Quote: White Dorpers I wouldn't touch with a long stick, lol... I both hear of and see some serious faults in that breed. Black face/neck Dorpers seem ok, but in Africa and a few other countries (Australia, UK) they reckon that of all sheep breeds, Dorpers have strong wanderlust and disrespect for fences. In Africa they make a joke: "if you buy a herd of Dorpers and bring them home, drop them off at a neighbor's a couple of places away from yours. In the next few days they'll end up on your place". Of course, keeping them on your place once they get there is another issue. They're powerful and don't mind breaking fences.
But my biggest issue with them is the unwise breeding behind the whites; some of them show serious deformity, but when breeders are focused on weight gain only they often don't pay attention to that, unfortunately. I don't know how to describe it, except to say they're breeding the back legs off them in pursuit of body length. The body is the same length as ever but where the back legs ought to be, you see the parts of the flanks and loin normally covered by haunches; and further back there's the hind legs, practically joined to the tail rather than the body. Sometimes breeders take shortcuts which seem to produce the same results as desired but which are in fact missteps. Many genes contribute to each characteristic, but many of them have other characteristics which accompany them and which have negative attributes. Anyone taking the shortcut in breeding to achieve a result in the shortest possible timeframe is going to breed on bad things as well, since you can't guarantee what you haven't seen and it takes a while for all faults to show.
Aussie White Dorpers have a high incidence of scoliosis of the spine, which may not apply to those in your country, and rarely applies to Blacks. But many Aussie animals of many breeds and species have horribly bent and twisted spines, now that many modern breeders place low importance on what is a serious genetic and ethical issue. Spinal scoliosis causes terrible and continual suffering, but both animals and humans with it tend to soldier on looking just fine.
Anyway, that's just my opinion on Dorpers, which may be the right choice for you, for all I know. Due to their physical type they're good lawnmowers since they've got a lot of growing to do, but personally I prefer more sound and stable animals... But, again, they may be fine in your country. Although I must say, the Santa Ines breed could do with more proponents, from what I hear. Worth preserving as opposed to a breed which is globally common. But then again, who knows, maybe your country has a very good strain of Dorpers that are also worth preserving... And then again maybe you're not going to breed them at all! lol, perhaps I speculate overly much.
All the best.