âI keep a flock of commercial Zwartbles ewes, they are; prolific, very milky, easy lambing, very good mothers and have longevity. I cross them with Texel, Beltex and Charollais rams. Lambs have excellent growth rate and are easily finished. Lambs I send to the factory usually grade U with a sprinkle of E and R. When the price per kg drops and weight limits increase in factories, Zwartbles are the number one. All of my replacements are bred within the flock from top quality Zwartbles ramsâ James Lynch Kiltormer, Ballinasloe, Co. Galway