Length of the growing R₄ in relation to time breeding stage at feather removal.

Abstract

<p>Variation of LengthRe (see Methods) in relation to breeding stage for the replacement feathers measured less than 40 days after removal of the original feather. The linear function fitted to females (F), the second-order polynomial function fitted to males (M), and the second-order polynomial function fitted to the two sexes pooled (F+M) are shown.</p