Beeton's Book of Poultry and Domestic Animals: Showing How to Rear and Manage Them in Sickness and in Health (Classic Reprint)

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Fb&c Limited, 2016 M10 5 - 522 páginas
Excerpt from Beeton's Book of Poultry and Domestic Animals: Showing How to Rear and Manage Them in Sickness and in Health

The air bones in young birds are described as being filled with marrow, which becomes gradually absorbed, to make room for the admission of air. This gradual expansion of the air-cells and absorption of the marrow can nowhere be observed so well as in young tame geese, when killed in different periods of the autumn and winter. The limits to the air-cells may be clearly seen without, from the transparency of the bony walls. From week to week the marrow disappears, and the air-vessels increase in size, till, towards the close of the season, they become transparent.

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