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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 104456
Title Over het effect van hyperthyreoidiseering bij witte leghorns
show extra info.
door J.B. van der Meulen
Author(s) Meulen, J.B. van der
Publisher Gorinchem : Noorduyn
Publication year 1938
Description X, 161 p
Notes Proefschrift Wageningen
Tutors Grijns, Prof. Dr. G.
Graduation date 1938-07-12
Dissertation no. 110
Author abstract show abstract
Oral feeding of White Leghorn hens on a thyroid preparation generally had only a very small toxic effect when given in one dose. A higher death rate occurred when given in small doses on consecutive days.

The hens fell into a moult, varying from slight to complete, 7 or 8 days after thyroid feeding. Severity depended on dose, season and feeding. The sensitivity to moult induction increased gradually from January to May, reaching maximum in summer. During natural moult in September hens were almost insensitive to thyroid preparation. This resistance decreased gradually until February-March.

After giving thyroid preparation, 1-3 eggs were produced, then followed a temporary interruption in egg production, varying in length with the individual, but usually in almost direct proportion to the quantity given. The maximum interruption lasted about 1.5 months despite larger doses. After moulting this maximum diminished to about 3 weeks. After an induced moult the birds rarely moulted again in autumn; yet egg production ceased as usual. Thus advanced moult cannot increase winter production. After induced interruption, normal egg production was resumed.

The influence of thyroid feeding on moult periodicity was probably controlled by another mechanism than that on egg production. A hypothesis was drawn up to explain these mechanisms.

Online full textINTERNET
On paper FORUM ; STACKS ; 523D38
FORUM ; STACKS ; NN08202,110
Keyword(s) (cab) poultry / fowls / zoology
Categories Poultry
Publication type PhD thesis
Language Dutch; Flemish
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