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 104361
Title Physiological and genetical aspects of egg production in White Plymouth Rock pullets
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J.H. van Middelkoop
Author(s) Middelkoop, J.H. van
Publisher Wageningen : Pudoc, Centre for Agricultural Publishing and Documentation
Publication year 1974
Description 76 p ill
Description 1 online resource (76 p) ill
Notes Proefschrift Wageningen  show all notes
Ook verschenen als handelsuitgave
ISBN 9022004996
Tutors Albada, Prof. Ir. M. van
Graduation date 1974-01-18
Dissertation no. 576
Author abstract show abstract

White Plymouth Rock pullets selected for a high 8-week bodyweight have an unsatisfactory production of hatching eggs, but this is not the only problem. In addition a great proportion of ovulated yolks are lost for the formation of normal eggs, because they are laid in abnormal eggs. In a study on the relationship between yolk production and egg formation, abnormal eggs were found to be laid when ovulation rate exceeded the limit of one ovulation per egg formation period.

Research on the genetic background showed that laying of double-yolked eggs, of two eggs a day, and of normal eggs only is genetically controlled to a large extent. Correlations were calculated between these laying traits and 8-week bodyweight, but those estimates did not provide a conclusive answer.

Economically, first eggs of a pair have also to be seen as abnormal, because they proved almost unhatchable.

With the help of the sex-linked dwarfing gene dw , it was shown that a reduction of yolk production in the ovary can result in an increase in normal egg laying in hens whose ovulation rate is too high. There seems therefore to be the relationship between total yolk production and the laying of abnormal or normal eggs.

Online full textINTERNET
On paper FORUM ; STACKS ; NN08202,576
FORUM ; STACKS ; NN08200,576
Keyword(s) (cab) breeds / fowls / genetic variation / genetics / heritability / oviposition / poultry / zoology
Categories Poultry
Publication type PhD thesis
Language English
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