The smaller the fraction saved, the greater the intensity, and more genetic progress. Greater intensity results in faster genetic progress, selection differential is greater. The average age of parents when the offspring born. Selection intensity - the fraction of individuals that are selected for the next generation. The smaller the fraction saved, the larger the intensity and more genetic progress can be made.
Intensity is greater for males than for females.
Number of traits being selected for. The more traits in a selection program, the lower the S.D. is for each respective trait. Intensity of selection refers to what fraction of individuals are selected for the next generation. Variation refers to the fact that genetic differences must exist for progress to be made. Generation interval refers to the average age of the parents at the time the offspring are born.