Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 421968
Title Physiological and genetical aspects of egg production in White Plymouth Rock pullets
Author(s) Middelkoop, J.H. van
Source Landbouwhogeschool Wageningen. Promotor(en): M. van Albada. - Wageningen : Pudoc, Centre for Agricultural Publishing and Documentation - ISBN 9789022004999 - 76
Department(s) Wageningen University
Publication type Dissertation, internally prepared
Publication year 1974
Keyword(s) rassen (dieren) - kippen - genetische variatie - genetica - heritability - ovipositie - pluimvee - zoölogie - breeds - fowls - genetic variation - genetics - oviposition - poultry - zoology
Categories Poultry
Abstract <p/>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.<p/>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.<p/>Economically, first eggs of a pair have also to be seen as abnormal, because they proved almost unhatchable.<p/>With the help of the sex-linked dwarfing gene <em>dw</em> , 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.
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