Within treatment prolactin by analyte correlation analysis also revealed a significant (P = 0.021) moderately strong correlation (r = 0.433) between prolactin and creatinine in HE but not LE steers, whereas correlations between prolactin and blood urea nitrogen:creatinine (r = 0.377; P = 0.064) and packed cell volume (r = 0.375; P = 0.065) were identified in LE but not HE steers. Here, PRL is linked to hereditary elliptocytosis.