Across 1800 lambs produced, the benefits of adding 1Kg deadweight to lambs are worth over £5000, and that’s after taking into account the cost of the supplementation. It was only when the method of supplementation was right that it was realised how much time and money had been wasted previously on ineffective treatments and the extent to which they were eating in to the performance of the flock.” In this article, Carmarthenshire sheep producer Paul Williams, of Maesyfelin Farm, Whitland, comments that this decision was a result of managing the trace element needs of his flock better.