LaMancha ears tend to be dominant! lol
We had two Nubian/LaMancha dams one year (one had elf ears, the other had shorter Nubian ears). Had 24 kids out of a purebred Nubian buck..of those 24 kids (there were only five kids that were 3/4 Nubian) one of our 3/4 Nubian, 1/4 LaMancha doelings had the LaMancha ears. She just had a doeling with the LaMancha ears as well. It is coming through from that original LaMancha sire!
We used a LaMancha buck for two years and have four daughter from him still. Three have elf ears and on one the Saanen ears came through stronger...we are still seeing LaMancha eared offspring out of those dams on a regular basis and out of their offspring. Baby throws a LaMancha eared doeling every year. It usually shows up in the dams that have the elf ears though. Snow White (the Saanen eared doe) doesn't throw LaMancha ears much, if at all. Danielle(Nubian/LaMancha), Utopia(Pygmy/LaMancha), and Baby(Pygmy/LaMancha) all throw them regularly. We consider it strange when they have twins without at least one having them.
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The doe in the way back is a Pygmy/LaMancha cross.
The other elf eared doe is the 3/4 Nubian, 1/4 LaMancha (her twin sister is the brown doe in the front left with the looong ears).

Here's her Dam, Danielle with one of this year's twin bucks...both had longer ears.

Here is Elegance's daughter from this year. Those LaMancha ears go back to her great grandfather on the dam's side.