Bukkit

The latest config v2.1 (1/20/20) -

# The chance a chicken will lay an egg, or something else.
# 100 = Always lay eggs.
# 50 = Half the time lay an egg, the other half the time lay a replacement
# 0 = Always lay replacement.
layChance: 50

# Replacements for eggs, an item for each egg drop from this list will be selected randomly.
# Valid material names can be found at http://jd.bukkit.org/rb/apidocs/org/bukkit/Material.html
# AIR is a valid replacement which when paired with layChance 0, will make chickens lay nothing.
replaceWith: 
 BRICK: 1
 AIR: 10
 
# Which worlds should this be enabled in?
# Unlisted worlds will allow normal egg laying.
enabled_worlds:
 - example_world
 - example_world_nether

# Customized world settings, just add world name, enabled:true, layChance and replaceWith for 
# the specific world. Any enabled_worlds that are NOT in perWorld, will use the default settings. 
# Any worlds added to perWorld that are NOT in enabled worlds will still be disabled.
perWorld:
 example_world:
 enabled: true
 layChance: 50
 replaceWith:
 BRICK: 1
 _chicken_boots: 1
 GOLD_INGOT: 1
 AIR: 10
 perBiome:
 PLAINS:
 enabled: true
 layChance: 50
 replaceWith:
 BRICK: 1
 _chicken_boots: 1
 GOLD_INGOT: 1
 AIR: 10
 TAIGA:
 enabled: true
 layChance: 50
 replaceWith:
 BRICK: 1
 _chicken_pants: 1
 GOLD_INGOT: 1
 AIR: 10
 DESERT:
 enabled: true
 layChance: 50
 replaceWith:
 BRICK: 1
 _chicken_hat: 1
 GOLD_INGOT: 1
 AIR: 10 
 JUNGLE:
 enabled: true
 layChance: 50
 replaceWith:
 BRICK: 1
 _chicken_vest: 1
 GOLD_INGOT: 1
 AIR: 10

# Named chickens can lay eggs or replacements as well. Named chickens do not have per biome settings.
custom:
 Clucky: 
 enabled: true
 layChance: 50
 replaceWith:
 DIAMOND: 1
 INK_SAC: 1
 IRON_INGOT: 1
 AIR: 10

# Special item drops, these can be anything you want, just create an item like the example, the 
# "type" needs to be an official bukkit item, you can apply enchantments, item name, data value, 
# lore and color if the item can have them. This is a very BETA feature and may have some bugs so be 
# careful! To link the special item put it in your replaceWith area with an underscore like so:
# _mySpecialItemName
special:
 chicken_boots: 
 type: LEATHER_BOOTS
 enchants: 
 PROTECTION_ENVIRONMENTAL: 1
 name: "Chicken Boots"
 lore: 
 - "From the chicken gods"
 color: 0x00FF00 
 chicken_hat: 
 type: LEATHER_HELMET
 enchants: 
 PROTECTION_ENVIRONMENTAL: 1
 name: "Chicken Hat"
 lore: 
 - "From the chicken gods"
 color: 0x00FF00 
 chicken_vest: 
 type: LEATHER_CHESTPLATE
 enchants: 
 PROTECTION_ENVIRONMENTAL: 1
 name: "Chicken Vest"
 lore: 
 - "From the chicken gods"
 color: 0x00FF00 
 chicken_pants: 
 type: LEATHER_LEGGINGS
 enchants: 
 PROTECTION_ENVIRONMENTAL: 1
 name: "Chicken Pants"
 lore: 
 - "From the chicken gods"
 color: 0x00FF00

# Enable logging (for debugging, generally leave this false unless you are having problems)
# Note that on production servers with lots of chicken farms this log could get very big!
debug_log: true