| establishment of gastro-intestinal helminth infections in free-range chickens: a longitudinal on farm study. | the objective of this study was to monitor establishment and development of gastro-intestinal helminth infections in chickens over two production years (py) on a free-range farm in lower saxony, germany. the data were collected between july 2010 and june 2011 (py1) and july 2011 and january 2013 (py2), respectively. during py1, lohmann brown classic (lb classic, n = 450) was tested, while in py2 two different genotypes (230 lb classic, 230 lb plus) were used. the hens were kept in two mobile sta ... | 2014 | 25080825 |