Library Catalogue

Library Catalogue

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    Union Catalogue of Agricultural Libraries in the Netherlands

    The WUR Library Catalogue contains bibliographic data on books and periodicals held by the libraries of Wageningen University and Research Centre and some 15 associated libraries. Holding data are added to each record.

    Subjects covered include Agrotechnology, Food and Food Production, Plant and Animal Sciences, Soil Science, Geo-information, Landscape and Spatial Planning, Water and Climate, Ecosystem Studies, Economics and Society.

    The joint collections of the participating libraries cover a substantial part of the internationally available scientific literature in these disciplines.

    As far as Dutch scientific literature in these fields is concerned, coverage can be considered near 100%, including much of the so-called "grey literature".

    All titles are entered in their original language. Keywords are added to facilitate subject searching.

    The database is updated every day and now contains over 830.000 records.

Record number 104638
Title Vergelijkend onderzoek op ratten en kuikens over de identiteit van het kunstmatige antirachitische vitamine (bestraald ergosterol) en het natuurlijke vitamine D uit kabeljauw-levertraan
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door M.J.L. Dols
Author(s) Dols, M.J.L.
Publisher Nijmegen : Centrale Drukkerij
Publication year 1935
Description 139 p + 2 pl.
Notes Proefschrift Wageningen
Tutors Grijns, Prof. Dr. G.
Graduation date 1935-04-16
Dissertation no. 87
Author abstract show abstract
Cod liver oil 2% sufficed to protect chickens against rickets, but irradiated ergosterol equivalent in rat units of vitamin D, equivalent to 20 % cod liver oil, was not sufficient. No single fact pointed to the presence of another factor in cod liver oil being indispensable besides vitamin D to protect chickens against rickets.

Unsaponifiable matter from cod liver oil, irradiated cholesterol or concentrate from tunny liver oil, all in rat units of vitamin D equivalent to 2 % cod liver oil were within limits of experimental error equally protective against rickets in chickens. Crystalline irradiated ergosterol was not identical with vitamin D from cod liver oil. The provitamin D in cholesterol, activated antirachitically by ultraviolet irradiation, was not ergosterol. Requirement of vitamin D by chickens from the 1st till the 75th day, either as cod liver oil or as tunny liver oil concentrate or of irradiated cholesterol was 250 IU per 100 g ration, about 80 IU daily per chicken.

To find rickets in chickens, radiography sometimes yields more information than examination of the skeleton post mortem. The average ash content of the tibiae was not a reliable comparison of the antirachitic efficiency of vitamin D preparations in chickens.

Online full textINTERNET
On paper FORUM ; SPEC.COLL. ; A2096,1935,4
FORUM ; STACKS ; NN08202,87
Keyword(s) (cab) vitamin d / rats / broilers / species differences
Categories Animal Nutrition Physiology
Publication type PhD thesis
Language Dutch; Flemish
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