The effect of vitamin A supplement on the incidence of pneumonia in lambs.
D000818:Animals; D019587:Dietary Supplements; D015994:Incidence; D011014:Pneumonia; D012756:Sheep; D014777:Virus Diseases; D014801:Vitamin A / Q000494:pharmacology*
D014801:Vitamin A
VIRUS DISEASES; VITAMIN A/effects