title: [The ionized calcium in the blood of domestic chickens: dependence on the laying cycle].
abstract: In the present study the plasma concentration of both ionized and total calcium in arterial as well as in venous blood of Leghorn hens and its dependence on the ovulatory cycle were investigated. During the ovulatory cycle, the concentration of ionized calcium in blood of hens follows the course of a sine curve. Maximum calcium ion concentrations (1.58 mmol/l in venous blood and 1.48 mmol/l in arterial blood, respectively) were observed 3 to 6 hours after oviposition, and minimum concentrations (1.26 and 1.19 mmol/l, respectively) at 18 to 21 hours after oviposition. Changes in total and ionized calcium concentration went parallel. Six to 9 hours after oviposition maximum values (4.24 and 4.15 mmol/l respectively) and 21 to 24 hours after oviposition minimum values (3.25 and 2.99 mmol/l, respectively) were measured. The arterio-venous difference was -0.22 mmol/l on average.
authors.affiliation: Institut für Physiologie, Physiologische Chemie und Ernährungsphysiologie, Tierärztlichen Fakultät, Ludwig-Maximilians-Universität München.
authors.forename: K
authors.initials: K
authors.lastname: Kölling
authors.forename: A
authors.initials: A
authors.lastname: Hofmeier
authors.forename: M
authors.initials: M
authors.lastname: Merkenschlager
mesh_terms: D000818:Animals; D002118:Calcium / Q000097:blood*; D002645:Chickens / Q000097:blood* / Q000502:physiology; D005260:Female; D010058:Oviposition / Q000502:physiology*; D010060:Ovulation / Q000502:physiology*; D012016:Reference Values
chemical_list: D002118:Calcium
vernacular_title: Das ionisierte Calcium im Blut des Haushuhnes: Abhängigkeit vom Legezyklus.