title: Sperm head length as a predictor of fecundity in the sandhill crane, Grus canadensis.
abstract: Semen samples from 14 sandhill cranes were collected for 15 weeks. Mean sperm head length which did not vary significantly over weeks was found to be significantly correlated with fertility (P less than 0 . 04; r = 0 . 54, n = 14).
mesh_terms: D000818:Animals; D001699:Biometry; D001717:Birds / Q000502:physiology*; D005298:Fertility; D008297:Male; D013077:Sperm Head / Q000502:physiology*; D013094:Spermatozoa / Q000166:cytology / Q000502:physiology*