Which of the following is NOT an EPD discussed in the presentation?

Mature weight is indeed not an expected progeny difference (EPD) that is commonly discussed in livestock selection presentations. EPDs are specific genetic predictions that provide information about expected performance traits of offspring based on the performance of their parents. Traits like birth weight, weaning weight, and scrotal circumference are often included in EPD discussions because they are significant indicators of the genetic potential for various important characteristics such as growth, fertility, and overall health in livestock.

Birth weight helps predict how easily a calf or lamb can be born, which is crucial for the health of both the mother and the offspring. Weaning weight offers insights into the growth rate of the animal from birth until weaning, indicating the maternal ability and nutritional adequacy of the mother. Scrotal circumference provides information about male fertility and, indirectly, the genetic potential for reproductive performance in his daughters.

On the other hand, mature weight refers to the size or weight an animal reaches when fully grown and is more of a descriptive statistic rather than a genetic prediction benchmark like the other three traits mentioned in the options. This distinction makes mature weight notably different than the other traits typically evaluated through EPDs.