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Ivanhoe Farming Company South Africa Danish Alfred Sorensen-Vedel Albert Theron seed potato inspector Certification Service KwaZulu-Natal crisps French fries generation concept pathogens disease tuber healthy strict quality control samples laboratory bacterial cultivar beef herd Red Angus British breed meat production calves weaned feedlot slaughterhouse Weaning less stress anti-suckling device nostrils maize trees Eucalyptus wood chips exported Japan