Large screening population

Use as large a screening population as possible, particularly in the early screening generations. In the early generations, the parasites will do most of the screening work anyway, killing all the susceptible individuals. It is then both feasible and economic to screen very large populations. It should be remembered that the larger the population, the greater the number of resistant individuals. In the early screening generations, the number of resistant individuals will be low, and their level of resistance will also be low.

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