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Modification of selection limits for egg number

Published online by Cambridge University Press:  14 April 2009

Hans Abplanalp
Hans Abplanalp
Affiliation:
Department of Poultry Husbandry, University of California, Davis, California

Extract

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An attempt was made to modify a near-limit of selection response in the egg production of a closed poultry flock which had been under selection for 31 years; to this end the laying hens were subjected to weekly periods of 24-hour feed deprivation, and selected for egg number under these conditions.

In two replicate populations genetic gains of about 20 eggs were made under shock treatment to 40 weeks of age, over 5 and 6 generations of selection. These gains were also manifest under normal management.

Selection, under 24-hour starvation per week, also improved the ability of the selected populations to lay under weekly starvation periods of 33 and 48 hours respectively. Differences between selected and unselected lines increased with the more severe stress treatments. Also it was found that the difference in average egg production between 33-hour and 48-hour treatments was larger in unselected lines than in the selected ones, indicating the existence of genotype-environment interactions.

Correlated responses of reduced egg-weight and body-weight, and somewhat earlier maturity of selected lines correspond with what might be expected under normally effective selection for egg number. These adaptations however varied considerably between replicate lines.

Type
Research Article
Information
Genetics Research , Volume 3 , Issue 2 , July 1962 , pp. 210 - 225
Copyright
Copyright © Cambridge University Press 1962

References

REFERENCES

Abplanalp, H. (1957). Genetic and environmental correlations among production traits of poultry. Poult. Sci. 36, 226–228.CrossRefGoogle Scholar
Blyth, J. S. S. (1952). The correlation between egg number and egg weight in the fowl: An investigation of its inconsistency. Poult. Sci. 31, 254–268.Google Scholar
Dempster, E. R., Lerner, I. M. & Lowry, Dorothy C. (1952). Continuous selection for egg production in poultry. Genetics, 37, 693–708.CrossRefGoogle ScholarPubMed
Dickerson, G. E. (1955). Genetic slippage in response to selection for multiple objectives. Cold Spr. Harbor Symp. quant. Biol. 20, 213–224.CrossRefGoogle ScholarPubMed
Falconer, D. S. (1960). Selection of mice for growth on high and low planes of nutrition. Genet. Res. 1, 91–113.Google Scholar
Lerner, I. M. (1954). Genetic Homeostasis. vii + 134 pp. London:Oliver & Boyd.Google Scholar
Lerner, I. M. (1958). The Genetic Basis of Selection. xvi + 298 pp. New York: John Wiley and Sons.Google Scholar
Lerner, I. M. & Dempster, E. R. (1956). An empirical test of part-record selection for egg production. Poult. Sci. 35, 1349–1355.Google Scholar
Lerner, I. M. & Hazel, L. N. (1947). Population genetics of a poultry flock under artificial selection. Genetics, 32, 325–339.Google Scholar
Lowry, D. C., Lerner, I. M. & Taylor, L. W. (1956). Intra-flock genetic merit under floor and cage managements. Poult. Sci. 35, 1034–1043.CrossRefGoogle Scholar
Lowry, D. C., Lerner, I. M. & Deslpster, E. R. (1960). Report on X-ray induction of variability in polygenic traits of chickens. (Abstract). Poult. Sci. 39, 1270.Google Scholar
Shoffner, R. N. & Grant, R. E. (1960). Relaxed selection in a strain of White Leghorns. Poult. Sci. 39, 63–66.Google Scholar
Shultz, F. T. (1953). Concurrent inbreeding and selection in the domestic fowl. Heredity, 7, 1–21.Google Scholar
Tebb, G. (1958). Intra-generation inbreeding effects in a poultry flock selected for egg production. Heredity, 12, 285–299.Google Scholar
Yamada, Y., Bohren, B. B. & Crittenden, L. B. (1958). Genetic analysis of a White Leghorn closed flock apparently plateaued for egg production. Poult. Sci. 37, 565–580.Google Scholar