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.

The second trial, which was conducted on Farm 2, investigated the effect of treatment alongside the date of treatment. All of the sheep within this trial had a previous lambing in November. A total of 150 animals were chosen and divided into 6 groups as outlined in Table 2.

Groups of the second trial, number of ewes of each group, treatment with melatonin implants (treated and untreated), date of treatment (March, April and May) and the date of ram introduction with Sarda breed sheep.

The third trial, which was conducted on Farm 3, investigated the effect of treatment alongside varying dates of the previous lambing. A total of 150 subjects were chosen and divided into 6 groups, as outlined in Table 3.

Groups of the third trial, number of ewes of each group, treatment with melatonin implants (treated and untreated), period of previous lambing (November, December and January) and the date of ram introduction with Sarda breed sheep.

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