Effects of chronic hypoxia on hematocrit ratios and heart size in the pigeon.
D000064:Acclimatization; D000818:Animals; D001835:Body Weight; D006332:Cardiomegaly / Q000209:etiology; D010856:Columbidae; D006321:Heart / Q000033:anatomy & histology*; D006400:Hematocrit; D000860:Hypoxia / Q000150:complications / Q000503:physiopathology*; D008297:Male; D011086:Polycythemia / Q000209:etiology