I would like to suggest another way to harvest mobs. If the item the mob likes (sheep - wheat, chicken - seeds) is in a photo frame the mobs would be attracted to it. Using this method you can dig holes in the ground and when random mobs walk past they will fall into it. You can also make a fenced area with a pressure plate in front of a gate (not behind) with a photo frame with the item inside the area, the animals will then walk into the area and not be able to come out. I would like this on PlayStation and PC edition, not only in mods but with the original game. Please update soon.
Regards,
PlayStation Username - Leprian
PC Username - Leprian123