Indirect spectrophotometry on vitamin A products: peak signal readout.
D000818:Animals; D002338:Carotenoids / Q000032:analysis; D002645:Chickens; D008099:Liver / Q000032:analysis*; D013053:Spectrophotometry / Q000379:methods; D013552:Swine; D014801:Vitamin A / Q000032:analysis* / Q000097:blood
D014801:Vitamin A; D002338:Carotenoids