title: The effect of pinealectomy on plasma levels of thyroid hormones in pigeons reared under different photoperiods.
abstract: The effects of pinealectomy on plasma T3, T4 and free T4 concentrations were studied for about 10 weeks in pigeons maintained either under a constant short photophase or in a regime where a long photophase was replaced by a short one during the experiments. The results indicate that, regardless of the photoperiod, no clear functional relationship can be found between the avian pineal gland and thyroid function, although a transitory increase in T4 levels was seen in both pinealectomized and sham-operated birds shortly after the operations.
authors.forename: H
authors.initials: H
authors.lastname: Rintamäki
authors.forename: H
authors.initials: H
authors.lastname: Reijonen
authors.forename: R
authors.initials: R
authors.lastname: Hissa
mesh_terms: D000064:Acclimatization; D000818:Animals; D010856:Columbidae; D003624:Darkness; D005260:Female; D007700:Kinetics; D008027:Light; D008297:Male; D010870:Pineal Gland / Q000502:physiology*; D013974:Thyroxine / Q000097:blood*; D014284:Triiodothyronine / Q000097:blood*
chemical_list: D014284:Triiodothyronine; D013974:Thyroxine