Development of lean and fat lines of chickens by sire family selection procedures

1988 ◽  
pp. 87-93 ◽  
Author(s):  
M.S. Lilburn ◽  
D.J. Myers-Miller
Keyword(s):  
Family Selection ◽  
Selection Procedures ◽  
Sire Family

XIX.—Family Selection in Poultry: the Use of Sire and Dam Family Averages in Choosing Male Parents

1957 ◽  
Vol 66 (4) ◽  
pp. 374-393 ◽  
Author(s):  
Robert Osborne
Keyword(s):  
Present Report ◽  
Family Selection ◽  
Average Performance ◽  
Sire Family ◽  
System 2 ◽  
Poultry Flock ◽  
System 1 ◽  
Efficient Selection ◽  
Weighted Combination ◽  
Selection Of

SynopsisA typical poultry flock consists of offspring from a number of sires each mated to several dams. In choosing male parents in a selection programme no criterion of individual merit may be available and selection must usually be based on the performance of related females. The present report deals with the theoretical efficiencies of three systems of selection of males(1) on the average performance of the dam family of a male's sisters.(2) on the average performance of the sire family of a male's full- and half-sisters.(3) on a weighted combination of sire family and dam family averages.For traits of low heritability system (2) may offer marked advantages over system (1), the only type of family selection previously investigated. This should prove of importance in flocks where recording facilities are limited. Providing environmental effects can be minimised, efficient selection may be based on the average performance of sire families housed as units without individual recording.The efficiency of system (2) declines with increasing heritability and is also subject to complications introduced by population size. In all cases, however, optimum gains may be obtained on system (3) when both dam family and sire family records are available.

Multivariate analysis to quantify genetic diversity and family selection in sour passion fruit under recurrent selection

Euphytica ◽  
2021 ◽  
Vol 217 (1) ◽  
Author(s):  
Amanda Fernanda Nunes Ferreira ◽  
Willian Krause ◽  
Maria Helena Menezes Cordeiro ◽  
Alexandre Pio Viana ◽  
Eileen Azevedo Santos ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Multivariate Analysis ◽  
Recurrent Selection ◽  
Passion Fruit ◽  
Family Selection ◽  
Sour Passion Fruit

scholarly journals EFFECTS OF POPULATION SIZE AND SELECTION INTENSITY ON SHORT-TERM RESPONSE TO SELECTION FOR POSTWEANING GAIN IN MICE

Genetics ◽  
1973 ◽  
Vol 73 (3) ◽  
pp. 513-530
Author(s):  
J P Hanrahan ◽  
E J Eisen ◽  
J E Legates
Keyword(s):  
Population Size ◽  
Selection Response ◽  
Selection Intensity ◽  
Realized Heritability ◽  
Family Selection ◽  
Effective Population ◽  
Population Sizes ◽  
Selection For ◽  
Selection Intensities ◽  
Term Response

ABSTRACT The effects of population size and selection intensity on the mean response was examined after 14 generations of within full-sib family selection for postweaning gain in mice. Population sizes of 1, 2, 4, 8 and 16 pair matings were each evaluated at selection intensities of 100% (control), 50% and 25% in a replicated experiment. Selection response per generation increased as selection intensity increased. Selection response and realized heritability tended to increase with increasing population size. Replicate variability in realized heritability was large at population sizes of 1, 2 and 4 pairs. Genetic drift was implicated as the primary factor causing the reduced response and lowered repeatability at the smaller population sizes. Lines with intended effective population sizes of 62 yielded larger selection responses per unit selection differential than lines with effective population sizes of 30 or less.

School leadership in Indonesia: A systematic literature review

2021 ◽  
pp. 174114322110108
Author(s):  
Nasib Tua Lumban Gaol
Keyword(s):  
School Leadership ◽  
Asia Pacific ◽  
Principal Selection ◽  
Selection Procedures ◽  
Leadership And Management ◽  
Sustainable Solutions ◽  
Selection Processes ◽  
High Quality Journal ◽  
School Leadership Practices ◽  
Social Sciences Citation Index

This paper reviews systematically literature on school leadership in the context of Indonesian education from 2004 to 2019. Its purpose is to investigate major issues which exist in the school leadership practices in Indonesia and propose some sustainable solutions so that educational policymakers, stakeholders and scholars can improve their awareness and knowledge of school leadership. Eight core international EDLM (educational leadership and management) journals were used as the source of the literature. Additionally, a high-quality journal with the indexation of Scopus and Social Sciences Citation Index, Asia Pacific Journal of Education (APJE), was included. The literature search yielded 16 articles that were reviewed. This study reports several crucial issues that need to have serious attention paid to them, including a lack of capacity to lead and manage schools, insufficiency of published studies, and the inappropriateness of principal selection processes. The suggested solutions for these problems consist of developing principal training centres in all the provinces of Indonesia, conducting more collaboration with overseas scholars, and improving principal selection procedures. Contributions for theory, practices and further study are provided.

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