title: [T4 metabolism in age matched heavy and light rats with good and bad feed efficiency following high- or low-in-fat diet].
abstract: Rats, fed two diets (high or low in fat content), were at the and of the feeding-period separated in light and in heavy animal groups. The leaner rats from the diet group high in fat content show opposite to the heavier animals of this diet group significantly increased T4 distribution spaces, significantly shortened T4 half life time and lower feed efficiency. T4 serum values, absolute T4 degradation per day and body mass and free thyroxine index in these leaner rats also increased significantly. However comparing heavy rats feed a diet low and light rats fed a diet high in rat content the latter  show also a decreased feed efficiency, but no differences in T4 serum concentration or T3 binding capacity of serum proteins, free thyroxine index and T4 degradation. The results in T4 metabolism are discussed in relation to feed efficiency of the investigated animal groups.
mesh_terms: D000818:Animals; D001835:Body Weight / Q000187:drug effects; D004041:Dietary Fats / Q000494:pharmacology*; D006207:Half-Life; D008297:Male; D011485:Protein Binding; D051381:Rats; D013974:Thyroxine / Q000097:blood*; D014284:Triiodothyronine / Q000097:blood
chemical_list: D004041:Dietary Fats; D014284:Triiodothyronine; D013974:Thyroxine
vernacular_title: T4-Stoffwechsel bei gleichaltrigen schweren und leichten Ratten, sog. guten und schlechten "Futterverwertern", nach Hoch- bzw. Niedrigfettdiät.