Grit made from crushed limestone or shells; dissolves in the stomach and is used as a calcium source.
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Grit made from crushed limestone or shells; dissolves in the stomach and is used as a calcium source.
An area that allows birds to scratch.
All traits except the gonads by which males and females differ externally and in...
The choice of individuals within a population to achieve a defined breeding obje...
The base population within which selection is carried out.
A measured trait or condition used as the basis for selection.
The difference between the mean of a selected group and the mean of the original...