Price deals for fat lambs are up 10p to 20p/kg, as local factories struggle to keep pace with a vibrant mart trade.Live exporters are extremely active in marts across NI, bidding on heavier lambs to ship to processing plants in Britain, where deadweight prices are in the region of 660p/kg. Lambs weighing 23kg to 26kg have consistently returned prices from £135 to £150 over the past week, with some isolated lots making closer to £160.