Activity No 5 Questionnaire on efficiency of phenotypic selection
description
Transcript of Activity No 5 Questionnaire on efficiency of phenotypic selection
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Activity No 5Questionnaire on efficiency of
phenotypic selection
Jan Kowalczyk, IBL P19Fulvio Ducci, CRA P12
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Phenotypic selection
• Method of selection, where the best individuals are selected on the basis of their appearance without any knowledge about the genetic parameters of the traits of interest.
• It includes also selecting of trees based on measurements but without calculating the genetic parameters.
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Result
• We receive 25 responses 82%. • Thank you for partners:
P1 P2 P3 P4 P5 P6 P7 P8P9 P10 P11 P12 P13 P14 P15P16 P17 P18 P19 P20 P21 P22P23 P24 P25 P26 P27 P28
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2. What species or group of species are involved:
20 – in total
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3. What kind of strategies are used during selection?
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4. What kind of methods of selection do you employ?
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5. Which kind of methods are used for phenotypic selection?
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6. What kind of observation and measurements are selection based on?
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7. What traits are interest?
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8. What are the objectives and methods of phenotypic selection ?
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9. Where is phenotypic selection applied?
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10. What is your raw estimation of the intensity of phenotypic selection?
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11. What is the effectiveness of phenotypic selection
• Unknown - 30%• Studied in practical examples 36%• Studied in simulations using parameters 18% :
– Statistics - i, – S and Genetic gain, – Combination attitudes (GCA and/or SCA)
• Other 15% – Realized gain in field trials as mean BLUP
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12. What is the scale of application of phenotypic selection?
• What is average number of plus trees selected per year? 1600 (min - 0, max - 350)
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13. What are the benefits of using phenotypic selection in your
opinion?
• Quick & easy• Low cost • Simple• First step of breeding • Gain can be really high (for
heritable traits)• Conservation of genetic diversity
• High throughput• Results are valuable also at
maternal level • Can result in higher gain per time
unit• Partial avoidance of genetic bottle-
necks • Resistance against diseases and
pests
• Unexplored G x E interactions at the selection site
• Reduced genetic gains • Efficiency unknown Low
reproducibility • No a-prori knowledge of genetic
basis • Subjective evaluation of certain
traits Superficial • Small variation - low number
selected tree • Special personnel needed• Based on juvenile traits
14. What are the disadvantages of using phenotypic selection in your
opinion?
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15. What is the future outlook for phenotypic selection?
• Decrease – 4 • No change - 8• Increase – 10
• 16. Practical example
• 17. Literature
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Conclusions
• Phenotypic selection is frequently used • It is accepted as a method of selection• It is often breeding-efficient• It is done frequently after measurements not
only based on observations