Most people know that domestic chickens have been selectively bred to lay an egg almost every day throughout their adult production life. They may not know that this places significant strain on the calcium metabolism in their bones. Research at the University of New England has shown that behavioural and physical impacts of housing systems begin during pullet development, but exercise is important throughout lay for maintaining bone strength. Free-range systems improve bone strength for those hens that range more, indicating that outdoor ranging can have long-term impacts on hen behaviour and subsequent skeletal health.
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