The first trial, which was conducted on Farm 1, investigated the effect of melatonin treatment alongside BCS. A total of 100 animals were chosen and divided according to their BCS based upon the methods utilized within Russel et al. [12]. A total of 50 subjects had a BCS of >2.5 (range 2.0–2.5) and the remaining 50 subjects had a BCS of <2.5 (range 2.6–3.0). The animals were further divided into 4 groups as outlined in Table 1.

Groups of the first trial, number of ewes of each group, level of body condition score (BCS) (<2.5 and >2.5), treatment with melatonin implants (treated and untreated) and the date of ram introduction with Sarda breed sheep.