Villager type Villager Never spawns

In minecraft.jar / mobs / villager there villager texture type "villager". has a green shirt. But such has never spawn villager in my games. I guess the function of this villager in trade is to sell some things of construction (may be possible). The issue is that there are spawns ever since the villagers and their eggs spawner. When they changed the format to spawn mobs spawn are made with eggs all types of villager has not spawn