I installed MendelSheep recently. Offspring of sheep will be a combination of the two sheep's qualities.
http://forums.bukkit.org/threads/mech-m ... r01.47590/
Check out the chart. "Hue" and "Lightness" are recessive, "Colorness" and "Naturalness" are dominant.
It's a little confusing, but play around with it.
Mendel sheep plugin
Re: Mendel sheep plugin
Hmm.. perhaps my main source of confusion and seeming randomness is that I can't tell my now.. 50 white sheep apart to know who dropped the white lambs, and who the 50 silver ones. So far the white combos have also produced one yellow, one black, and one magenta. The magenta successfully bred with a white sheep to drop a pink lamb and a magenta one, but so far no combo of black +white or +silver has made dark grey or brown. And all silver+silver has resulted in silver lambs. Very curious.