Sheep, cow, pig, and especially chicken breeding seems to be based on a chance event. I estimate it to be around a one in five success rate at...
I've found two plugins, but they're both outdated: http://forums.bukkit.org/threads/misc-antidecay-v1-0-stop-leaves-decaying-1000.28928/...
this conflicts with nolagg, together, they let you pick up the red wool, redstone, and bones
this conflicts with bleeding mobs, lets you pick up the redstone, bones, and red wool that you ussually can't
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