The Decline in Annual Egg Production with Age
نویسندگان
چکیده
منابع مشابه
The Rate of Senescence of the Domestic Fowl as Measured by the Decline in Egg Production with Age
Data are presented showing that the course of decline of egg production with age in the domestic fowl from the time laying begins up to and including 8 years follows an exponential law, that is, each year's egg production is a constant percentage of the preceding year's production (88 per cent in the group of fowl studied). Since the exponential law is the same as the law of monomolecular chang...
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Data of four layers flocks (#31-34) from North Carolina Layer Performance and Management Test of the Department of Agriculture and Consumer Services were used in the meta-analysis to find if an increase in space allowance can affect egg production traits in white and brown layers. Effects of space allowance of 310 and 413 cm2/bird on layers performance were compared in this study. The increase ...
متن کاملThe effect of age on egg production in the domestic hen.
The effect of age on egg production was investigated in the domestic fowl. The rate of egg production was reduced with increasing age and the incidence of thin-shelled and cracked eggs was markedly increased. Older hens which remained in lay produced fewer but larger eggs than the younger birds. The ovaries of these two groups of hens were of similar appearance but the largest preovulatory foll...
متن کاملMothers reduce egg provisioning with age
David Giron* and Jérôme Casas Institut de Recherche sur la Biologie de l’Insecte (Centre Nationale de la Recherche Scientifique, Unité Mixte de Recherche 6035), Faculté des Sciences, Université de Tours, 37200 Tours, France *Correspondence: E-mail: [email protected] Abstract Precise and comprehensive data on resource allocation into individual eggs are rare and this empirical void in the lite...
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ژورنال
عنوان ژورنال: Poultry Science
سال: 1942
ISSN: 0032-5791
DOI: 10.3382/ps.0210455