Your 14% figure stems from a single study, precisely the oldest study mentioned on the report linked, while three paragraphs down it mentions the newest study, quote:
"The most recent results (University of Bristol; Defra project AW0234), from a
survey of 67 flocks (not including conventional cages) were similar but even worse,
particularly because only keel bone fractures were recorded. Thirty six per cent of
hens from enriched cages had fractures (of the keel bone) and the average
prevalence in other non-cage systems ranged from 45 to 86%. In the worst flocks,
95% of hens had fractured keel bones." (Emphasis mine.)
The report I linked even says that the old results massively under estimate bone fractures because they seldomly used x-rays to find them!
And not only that, your 14% figure are the new fractures, i.e. the ones that did not occur during laying! One newer study from 2006, mentioned in your report just two paragraphs after the one you got your figure from, estimates these old fractures of free range hens at 44%!
> The fractures seem to be mostly unrelated to the number of eggs laid in this study.
Even that is explicitly contradicted by your report, quote:
"Osteoporosis is further exacerbated by the great egg output of modern
hybrids. In 1930, a hen laid around 115 eggs in a laying cycle (from about 20 to 72
weeks of age) but nowadays a hen lays around 300 eggs, almost an egg per day for
a year. A hen’s need for calcium for eggs exceeds her body reserves by about 30
times."
Please, actually be honest on offering a counterpoint.
"The most recent results (University of Bristol; Defra project AW0234), from a survey of 67 flocks (not including conventional cages) were similar but even worse, particularly because only keel bone fractures were recorded. Thirty six per cent of hens from enriched cages had fractures (of the keel bone) and the average prevalence in other non-cage systems ranged from 45 to 86%. In the worst flocks, 95% of hens had fractured keel bones." (Emphasis mine.)
The report I linked even says that the old results massively under estimate bone fractures because they seldomly used x-rays to find them!
And not only that, your 14% figure are the new fractures, i.e. the ones that did not occur during laying! One newer study from 2006, mentioned in your report just two paragraphs after the one you got your figure from, estimates these old fractures of free range hens at 44%!
> The fractures seem to be mostly unrelated to the number of eggs laid in this study.
Even that is explicitly contradicted by your report, quote:
"Osteoporosis is further exacerbated by the great egg output of modern hybrids. In 1930, a hen laid around 115 eggs in a laying cycle (from about 20 to 72 weeks of age) but nowadays a hen lays around 300 eggs, almost an egg per day for a year. A hen’s need for calcium for eggs exceeds her body reserves by about 30 times."
Please, actually be honest on offering a counterpoint.