The performance of the Border Leicester in Australia

Abstract

<i><b>Aims.</b></i> We examine the average performance of Border Leicester (BL) flocks that are part of LAMBPLAN, Australia's sheep performance recording and genetic evaluation system. We also summarise outcomes from the New South Wales Department of Primary Industry's research on BL improvement, and discuss the performance required for the BL to continue to be a pivotal part of the Australian prime lamb industry.<br/> <i><b>Key results.</b></i> Modest gains have been recorded in the BL in growth since 2000 and faecal egg counts have reduced, suggesting improved worm resistance. The net reproductive rate has slightly improved, while inbreeding continues to increase. In work conducted by the New South Wales Department of Primary Industries, an improved BL flock, encompassing selection for multiple births and a broadening of the breed's genetic base, had advantages over purebred BLs in many aspects of performance, including a 19.3% advantage in the net reproductive rate. Advantages in fertility were ~5%, litter size ~7% and lamb rearing ability ~5%. BL improved X Merino and (BL improved X BL) X Merino crossbred ewes also had advantages over traditional BL X Merino ewes in their joining performance when joined to Dorset rams.<br/> <i><b>Conclusions.</b></i> Selection in the BL needs to emphasise traits in a manner consistent with their importance to commercial lamb production.<br/> <i><b>Implications.</b></i> Embracing this selection and broadening the BL's genetic base will assist the BL to maintain its place in the Australian lamb industry.