the herd was divided into six open lost.
the first lot corralled the high-producing cows and early lactation cows;the second had average producing cows, and lot 3 had the poorer producing cows.
lot 4 through 6 were smaller lots and housed prepartum cows, sick cows and dry cows,respectively.
lots 1 through 3 were graded soil;the others were bedded with straw.
lot size was ample for each group.