Figure 4: Mean (±SEM) circulating concentrations of prolactin (PRL) determined in 48-h fasted (Panel A) and normally fed (Panel B) Polish Longwool ewes during the short day (SD; October- November) and long day (LD; April-May) seasons. The treatments were as follows: 1) saline (control), 2) ghrelin (GHRL; 2.5 μg/kg b.w.), 3) m-CPP (serotonin 5-HT2B/2C receptor agonist; 2.5 mg/kg b.w.) or 4) GHRL with m-CPP. Values denoted by asterisks or different letters are significantly different: ab (P<0.05), AB W-Z or ** (P < 0.01).