>Mature Christmas trees must be one of the highest-value crops you can steal from a farm
If you have the equipment/motivation to steal christmas trees, you probably could be stealing animals too. Those are proabbly worth even more than christmas trees, probably several hundred dollars each.
Harder to dispose of, though. You'll need to be in league with a crooked farmer, slaughterhouse or livestock mart if you want to sell the animal alive. You can sell Christmas trees on the side of the road, no questions asked.
If you have the equipment/motivation to steal christmas trees, you probably could be stealing animals too. Those are proabbly worth even more than christmas trees, probably several hundred dollars each.