A comparison of the responses of captive willow ptarmigan (Lagopus lagopus lagopus), red grouse (Lagopus lagopus scoticus), and hybrids to increasing daylengths with observations on the modifying effects of nutrition and crowding in red grouse.
D000818:Animals; D001717:Birds / Q000502:physiology*; D003441:Crowding / Q000502:physiology; D004044:Dietary Proteins / Q000008:administration & dosage; D005241:Feathers / Q000502:physiology; D005260:Female; D008027:Light; D007986:Luteinizing Hormone / Q000097:blood; D008297:Male; D010058:Oviposition / Q000528:radiation effects; D010507:Periodicity
D004044:Dietary Proteins; D007986:Luteinizing Hormone