Body Weight Uniformity
In addition to body weight averages, the uniformity of body weights within the flock is an indicator of normal flock development. Uniformity is expressed as the percent of individual weights which occur within 10% of the current flock average. The goal at point of lay is minimum 80% uniformity, although uniformities of 90% are often seen. Flocks lacking uniformity at point of lay often exhibit lower and later peaks than expected and are more difficult to design diets for (because there is a mixture of light and heavy birds in the flock). In grow, flocks of low uniformity can be segregated into similar weight groups to reduce feed competition between large, medium, and small birds. These groups should be managed differently to allow the small group to gain weight faster.