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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 104498
Title Egg shell quality and microstructure as affected by vitamin C, other feed additives and high environmental temperatures
show extra info.
door A.R. El-Boushy
Author(s) El-Boushy, A.R.
Publisher Wageningen : Veenman
Publication year 1966
Description 79 p ill
Notes Proefschrift Wageningen
Ook verschenen als handelsuitgave
Tutors Frens, Prof. Drs. A.M.
Graduation date 1966-10-07
Dissertation no. 402
Author abstract show abstract
The effects of climatic stress on egg formation (weight, shape, formation period, clutch size and blood calcium) and shell quality were estimated in White Leghorn and White Plymouth Rock hens. Constant environments were used with 85°F 75- 80% r.h., 75-77°F 50-60% r.h. and 55°F 50-60% r.h. as well as a fluctuating environment with 10 h (day) 85°F 75-80% r.h. and 14 h (night) 65-70°F 50-60% r.h. The effects of dietary vitamin C (50 or 100 mg/kg feed), NaHCO 3 2.1 % and antibiotics were also tested.

The author concluded the following. Fluctuating temperature had no effect. In heat-stressed hens vitamin C improved the diminished shell quality and raised blood calcium.

At 75°F vitamin C and NaHCO 3 increased egg weight and shell quality. Combinations of antibiotics improved egg and shell weight. Microscopy of ground sections of the shell showed that heat diminished shell thickness and impaired the crystal structure of the calcified shell; vitamin C addition improved shell thickness.

Online full textINTERNET
On paper FORUM ; STACKS ; NN08202,402
FORUM ; STACKS ; NN08200,402
Keyword(s) (cab) animal physiology / egg shell / poultry / fowls / quality / performance / feeds / composition / environmental factors / immunology / antigens / feed additives / care of animals
Categories Feed Additives / Food Products (General)
Publication type PhD thesis
Language English
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