With a selected proportion of 5%, for example, response to mass selection is reduced by only 7% when h = 0.10 but by 21% when h = 0.50 (Table 1).
Mass selection has long been a major method of breeding cross-pollinated species, especially in the economically less important species.
The most important methods of breeding cross-pollinated species are (1) mass selection; (2) development of hybrid varieties; and (3) development of synthetic varieties.
Mass selection has proved to be very effective in improving qualitative characters, and, applied over many generations, it is also capable of improving quantitative characters, including yield, despite the low heritability of such characters.
Mass selection in cross-pollinated species takes the same form as in self-pollinated species; i.e., a large number of superior appearing plants are selected and harvested in bulk and the seed used to produce the next generation.
This makes the mass selection and cluster isolation more challenging.
Genetic engineering and mass selection with naturally occurring landraces present two extreme cases.
(Middle) Using mass selection, a specific cluster is picked out of the cluster beam.
The extracted ions (without mass selection) are accelerated to the maximum energy of 30 keV.
To evaluate the potential of mass selection for fillet traits, however, genetic parameters are required.
Mass selection operates on a daily basis even in developed nations, where a number of noteworthy initiatives have emerged.
