title: The effect of serial removal of blood on plasma concentrations of luteinizing hormone during the ovulatory cycle of the hen.
abstract: Plasma concentrations of luteinizing hormone (LH) and corticosterone were measured during the ovulatory cycle of laying hens. Blood samples were removed either serially at 2-hr intervals from individual hens or intermittently from randomly selected hens in a large population. The removal of serial samples of blood was associated with an increase in the concentration of corticosterone, and in hens which continued to lay normally, elevated concentrations of LH. Twenty percent of hens from which serial samples of blood were removed terminated their reproductive cycle prematurely, and in these hens the concentrations of LH were depressed.
mesh_terms: D000818:Animals; D001800:Blood Specimen Collection / Q000379:methods / Q000662:veterinary*; D002645:Chickens / Q000502:physiology*; D003345:Corticosterone / Q000097:blood*; D005260:Female; D007986:Luteinizing Hormone / Q000097:blood*; D010060:Ovulation
chemical_list: D007986:Luteinizing Hormone; D003345:Corticosterone