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- W287018045 abstract "Summary Some opponents of cage housing for laying hens argue that nest boxes are important for hen welfare. Evidence to support this argument is that most hens choose to lay in a nest box if available (i.e. hens show preference), and hens are more active in the absence of a nest box and may perform pacing before egg laying (i.e. hens show frustration). In this experiment, in which hens were housed in groups of 2, 4 or 8 in 8-bird cages with and without a nest box, we investigated the relationship between pre-laying activity and basal stress levels, measured via corticosterone in eggs and plasma (~4-5 h post-laying). The posture and behaviour of 58 Hy-line Brown hens during 2-h pre-laying were collated from video records for a total of 135 egg-laying events. Hens that displayed more bouts of sitting posture, or that spent less time sitting, had higher plasma corticosterone concentrations. Further, hens that displayed more pre-laying activity had lower plasma corticosterone concentrations, although the occurrence of walk/run behaviour was not associated with plasma corticosterone. Lower activity, increased frequency of sitting and reduced time spent sitting prior to oviposition may reflect increased stress as indicated by the higher plasma corticosterone concentrations. While the evidence is limited, the finding that some pre-laying activities of hens were related to plasma corticosterone concentrations is contrary to expectation, and highlights a lack understanding of the relevance of pre-laying activity and sitting posture to layer hen welfare." @default.
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- W287018045 date "2012-01-01" @default.
- W287018045 modified "2023-09-26" @default.
- W287018045 title "THE RELATIONSHIP BETWEEN PRE-LAYING ACTIVITY AND CORTICOSTERONE CONCENTRATIONS, AND THE INTERPRETATION FOR LAYING HEN WELFARE" @default.
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