title: Cyclic changes in plasma phosphorus of laying turkeys.
abstract: Plasma phosphorus of laying turkeys measured at 0, 6, 18, and 24 hr after oviposition showed a cyclic pattern similar to that reported for laying chickens. Plasma phosphorus was lowest at oviposition and remained relatively low until 6 hr postoviposition; values at 18 and 24 hr postoviposition were higher. Plasma phosphorus was higher (P less than .05) 24 hr postoviposition than 0 or 6 hr postoviposition. The changes were assumed to be associated with egg shell calcification and bone resorption. Plasma phosphorus values of turkey toms measured during a 24-hr period remained constant and were not significantly (P less than .05) different from each other.
mesh_terms: D000818:Animals; D002940:Circadian Rhythm; D005260:Female; D008297:Male; D010058:Oviposition; D010758:Phosphorus / Q000097:blood*; D014422:Turkeys / Q000097:blood* / Q000502:physiology
chemical_list: D010758:Phosphorus