CP and hereditary elliptocytosis: ACV × CP, ACV × HE or CP × HE interactions were also found to be significant for proportions (%) of H and L. In vaccinated birds, increased CP or HE supplementation resulted in a reduction of H and in an increase in L proportions in leukograms compared to vaccinated birds with normal CP levels or without HE supplementation, respectively (Table S1 in Supplementary Materials).