Publication Date
1993
Description
The effectiveness of various strategies of selection for yield was tested using high performing white clover (Trifolium repens L.) lines derived from crosses between elite Grasslands Huia genotypes and elite genotypes from introduced germpiasm. There appeared to be no clear advantage of selecting genotypes, at the same intensity of selection, in the top 12.5% of families compared with the top 50% of families, There was a weak trend towards higher yielding progeny with increasing selection intensity. It was more effective to use individual selection within families based on performance rather than family selection, However, this effect was specific to first-year growth and subsequently disappeared, Selection by either method gave better-performing progeny than no selection at all. There was no significant difference between progeny from genotypes selected on first-year performance compared with second- and third-year performances, eJ1cept after cycle 1 when tested under sward conditions. Three cycles of recurrent selection, where selection was of the best genotypes of the best lines in year 1 or years 2 and 3 growth, were compared in grazed grass swards. All had a significantly greater yield than Huia except cycle 1, year 2 and 3 selection,
Citation
Caradus, J R. and Williams, W M., "Effect of Method and Intensity of Selection for Yield in White Clover" (2024). IGC Proceedings (1993-2023). 29.
https://uknowledge.uky.edu/igc/1993/session12/29
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Effect of Method and Intensity of Selection for Yield in White Clover
The effectiveness of various strategies of selection for yield was tested using high performing white clover (Trifolium repens L.) lines derived from crosses between elite Grasslands Huia genotypes and elite genotypes from introduced germpiasm. There appeared to be no clear advantage of selecting genotypes, at the same intensity of selection, in the top 12.5% of families compared with the top 50% of families, There was a weak trend towards higher yielding progeny with increasing selection intensity. It was more effective to use individual selection within families based on performance rather than family selection, However, this effect was specific to first-year growth and subsequently disappeared, Selection by either method gave better-performing progeny than no selection at all. There was no significant difference between progeny from genotypes selected on first-year performance compared with second- and third-year performances, eJ1cept after cycle 1 when tested under sward conditions. Three cycles of recurrent selection, where selection was of the best genotypes of the best lines in year 1 or years 2 and 3 growth, were compared in grazed grass swards. All had a significantly greater yield than Huia except cycle 1, year 2 and 3 selection,
