On changing the carotene
content of the pellets from 250 mg/kg to 0 added
carotene/kg there was an exponential decrease in
PCC. Analysis of the data using iterative curve
peeling methods indicated a 2-component
exponential model best fitted the data which
suggested there were two pools of carotene affecting
PCC. Despite large differences in overall mean
PCC there were high correlations between PCC
measured on different days, in the heifers on the
feedpad. In conclusion, the ranking of heifers for
PCC was relatively constant provided the carotene
intakes of the heifers were the same