Seasonal rhythm in plasma testosterone and luteinising hormone of the male laboratory rat.
D000367:Age Factors; D000818:Animals; D006063:Chorionic Gonadotropin / Q000494:pharmacology; D007986:Luteinizing Hormone / Q000097:blood*; D008297:Male; D010507:Periodicity; D011863:Radioimmunoassay; D051381:Rats; D012621:Seasons; D013739:Testosterone / Q000097:blood*
D006063:Chorionic Gonadotropin; D013739:Testosterone; D007986:Luteinizing Hormone