Secondary plumage that replaces the chick down and is renewed at regular intervals by molting.
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Secondary plumage that replaces the chick down and is renewed at regular intervals by molting.
Horny structure at the end of the toe.
Constitution type characterized by a fine skeleton, dry joints, fine, seemingly ...
Bean- to egg-shaped male gonads located in the body cavity; they produce sperm a...
Control involving evaluation of the quality of hatching eggs and analysis of dea...
Symbol for the amino acid threonine.
Common name for 2‑amino‑3‑hydroxybutyric acid; an amino acid commonly found in p...