Show improvement material assuredly purebred pure bred bulls must come from an ancestry that has baa proved to be stronger la in production than the grade herds into which they are going the fact that there were more grade herds tn la the iowa cow testing list than there were purebred pure bred breil herds does not dot prove that farmer must cease to look to pure for tier bierd d improvement material however la in the first place the highest prodoc 0 ing pure bred herds are seldom put po ott on test lest in cow testing associations |