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The scheme was repeated during 2 vegetation periods with flock X1 (starting at around 8 mo of lay) from April to the beginning of August of the first vegetation period and flock X2 (whole laying period) from August of the first to August of the second vegetation period.The effect of replacing woodchips on the area in front of the henhouse on turf quality and para-site infection was tested on farm Y. Four groups of layers, comprising 2 replicates (YA, YB and YC, YD) were investigated during an experi-mental period of approximately 12 mo and re-peated with new birds in the following year: The first 10 m of the paddocks of groups YC and YD were covered with approximately 25 cm of wood chips (mainly beech, approximately 3 cm long; ~200 m2/1,000 hens); the paddocks of groups YA and YB remained unaltered (Figure 1). The total surfaces of paddocks A to D were identical (2,500 m2for 500 hens).Data were recorded during 2 laying periods with flock Y1 (ending in June of the first vegeta-tion period) and flock Y2 (ending in June of the second vegetation period). Flock Y2 was treated
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