No abstract. The following taken from the introduction:
"It may be argued that a datry farmer who is teeting hls
eow8 every year and breedlng hts own replacement helfers, slred
by pedtgree dalry bull-s wlth r.easonable bntterfat backtng,
shorrld by a prognamme of .tntelligent cuLltng, be able to
establtsh and malntain a herrl consistlng malnly of mature cows
of hlgh produclng abtllty. Thls ls the polnt that thts stucly
endeavours to answer."