ArticleAnimals : an open access journal from MDPI2026
Metabolic, Hormonal and Body Condition Changes in Melatonin-Implanted Dairy Rams and Flock Pregnancy Rate During the Mating Season: A Longitudinal Field Study.
Article in Animals : an open access journal from MDPI, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Reproductive activity imposes significant physiological demands on rams. This study evaluated metabolic and hormonal fluctuations in Sarda rams under semi-extensive management conditions, together with flock reproductive outcomes. Fourteen rams were isolated from ewes, subjected to nutritional flushing, and treated with melatonin implants (3 × 18 mg) before joining the flock. From June to December, body condition score (BCS), non-esterified fatty acids (NEFA), urea, triglycerides, cholesterol, testosterone, faecal thyroid hormone metabolites (FTMs), and faecal corticosteroid metabolites (FCMs) were measured every 45 days. Ewes' pregnancy rates (PRs) and conception dates were determined by ultrasound scanning to estimate flock reproductive performance. BCS declined (
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