From the above example one can see that whole commercially available chickens without innards may contain too much bones vs. meat to be fed longterm as a sole dietary source to cats (2 parts meat vs. 1 part bones), but clearly, wings (necks) and backs are definitely way too rich in bones and should only be fed as a supplement to lean meat. Meyer/Zentek say that 1 g of bones per 1 kg of body weight suffice to cover maintenance requirements for calcium and phosphorus but should not exceed 10 g per day per kilo body weight. Note that approx. 70% of the dry, fat-free mature bone are minerals (generally known as bone ash) of which the chief components are 80% Ca3(PO4) = calcium phosphate, 13% CaCO3 = calcium carbonate and 2% Mg(PO4) = magnesium phosphate and the remainder 5% will be small amounts of other macro minerals and trace minerals. The remaining 30% of bone (dry, fat-free) is the organic fraction, over 90% of which is collagen which has low digestibility and is (to some extent) subject to bacterial fermentation in the colon.
Bone content in various parts of chicken
Skin Lean, Fat Bone
Skin,g % Lean,g % Fat,g % Bone,g % Total,g
Wings
Breast
Legs
Back
Total
Feed
Viscera,
Blood,
Feathers
Head/beck
Live
weight
95.09
459.82
211.65
2477.45
References:
Field, RA: Ash and Calcium as measures of bone in meat and bone mixtures, Meat Science 53 (2000), pp. 255-264
Lin, RS; Chen, LR; Huang, SC; Liu CY: Electromagnetic scanning to estimate carcass lean content of Taiwan native broilers, Meat Science 61 (2002), pp. 295-300
Meyer H; Zentek J.: Ernährung des Hundes, Grundlagen, Fütterung, Diätetik, Parey Buchverlag Berlin 1998, ISBN 3-8263-8423-7
54.68
26.27
98.98
44.15
0.20
65.58
30.48
219.34
0.09
442.95
14.81
64.63
4.52
39.68
8.88
317.47
71.97
21.27
59.71
1.26
10.70
394.76
68.63
12.01
105.06
18.41
572.08
37.08
9.39
123.72
32.10
9.48
38.94
189.91
49.03
389.65
190.95
11.76
934.93
67.67
72.42
4.46
425.72
26.21
1624.02
