The area covered by standing male meat turkeys between 11 and 21 weeks of age was measured by planimetry on photographs taken from directly above the birds. There was a strong relationship (r=0.86) between their liveweight and the area covered, and a formula was derived for the calculation of the area covered by turkeys weighing between 7.6 and 21.8 kg. A comparison with the formula developed on theoretical grounds in 1995 by the Farm Animal Welfare Council (FAwc) showed that for heavy turkeys the FAwc formula is not valid, because it yields values which are about 50 per cent too low.
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