Calculating response to selection - Genetics help!?

Question

Ok not looking for someone to do my homework just wondering if anyone could tell me how to calculate the expected progeny mean if i know the i value for the bull but am only told that the heifers used were 215kg and over (whole group mean 205kg) It hints something about truncation point.

Any help get 10 points thanks!

Answer 1

i think this may help

http://www.ext.vt.edu/pubs/beef/400-804/...

Answer 2

Wow, I just answered a physics ?, and now biology lol jk

and, this doesn't sound like biology WTF