American Pipit (Anthus rubescens) Science Article 1
Hatchability often is reported as the proportion of eggs laid that hatch. While this may be the demographic value of ultimate interest as an index of recruitment, such broad usage makes it difficult or impossible to identify more specific proximate factors affecting hatching and the extent that these may vary.
PAUL HENDRICKS, Wilson Bull., 106(2), 1994, pp. 392-399