Selection for Egg Number With X-Ray-Induced Variation

Responses from four generations of index selection for egg production to 280 days of age in four White Leghorn populations have been presented. A pedigreed randombred population derived from one of the lines was reared with the selected lines to measure the environmental trend. The magnitude of total as well as average response although varying from population to population was positive in all the lines studied. Close correspondence between predicted and realized gains indicated that natural selection, genotype environmental interactions and environmental fluctuations were unimportant during the course of selection. Realized heritabilities agreed fairly well with the estimated heritabilities in at least three out of four populations studied. Probable reasons for variable and insufficient response were investigated.

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Selection for egg production on part records

Ayyagari

Mohapatra

Venkatramaiah

et al. 1980

Theoret. Appl. Genetics

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Selection for egg production on part records

Ayyagari

Mohapatra²,

Venkatramaiah³

et al. 1983

Theoret. Appl. Genetics

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Response in the selected and the correlated traits from five generations of index selection (I.D.S. method) for egg production to 40 weeks of age in four White Leghorn populations have been presented. The correlated traits measured included: Age at first egg, egg weight, body weight and also derived traits such as egg mass, survivors' rate of lay, efficiency index and ratio of egg weight to body weight. Response realized for the selected trait was significant in three out of the four selected lines. Predicted and realized genetic gains were comparable in magnitude for most of the traits studied. The significance of these findings in selection experiments is discussed.

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Selection for increased abdominal bristle number in Drosophila melanogaster with concurrent irradiation

Hollingdale

Barker

1971

Theoret. Appl. Genetics

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Replicate lines, each initially with one hundred pairs of parents selected at 50% intensity, were derived from the Canberra strain. In later generations population size was reduced and selection intensity increased. Three lines were selected without irradiation and five with 1000 r X-rays per generation for thirty generations. Selection was continued until generation 66. Long-term responses were similar in unirradiated and irradiated lines, and there was evidence that genes with large effects influenced response patterns in both groups of lines.

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Selection for Egg Number With X-Ray-Induced Variation

Abstract: XPERIMENTS designed to utilize radiation-induced genetic variability E through artificial selection are relatively recent. Unlike studies with muta-Genetiis 5 0 : 1 0 8~1 1 0 0 Notember 1964.

Cited by 31 publications

References 11 publications

Selection for egg production on part records

Selection for egg production on part records

Selection for egg production on part records

Selection for increased abdominal bristle number in Drosophila melanogaster with concurrent irradiation

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