title: The relation of the colour and vitamin A content of butter to the nature of the ration fed: The influence of the ration on the yellow colour of the butter. II. The carotenoid and vitamin A contents of the butter.
authors.affiliation: I.C.I. Agricultural Research Station, Jealotts Hill, Berks.
authors.forename: S J
authors.initials: SJ
authors.lastname: Watson