Birds uniformity importance & calculation

1. Birds uniformity
Dr. S. Kumaresan

2. Flock uniformity
• Uniformity indicates the percentage of the flock that falls within a certain
range of the average flock bodyweight.
• It can be expressed as the coefficient of variation in live weight, with
increase CV values indicate decreased uniformity.

3. Uniformity importance
• Uniformity in breeders importance because we have to apply the
management to the whole flock, where smaller or less developed birds
need another management then bigger or more developed birds.
• In broilers it determines the range of bodyweight and intense breast meat
yields. It also increase average body weight of the flock.

4. Uniformity of flock influenced by
• Brooding quality of flock
• Diseases
• Competition for feeder (feeder space)
• Feed distribution method
• Birds space
• Grading (separation in weight groups)

5. Benefits of flock uniformity
• Improve production % of flock
• Uniform immunity of flock
• Reduce mortality % of flock
• Up to 10% increase the fertility and hatchability
• Improve birds welfare (reduce feed wastage, stress and pecking).

6. Uniformity calculation
1. Uniformity % = No. of birds within range ± 10% of mean wt. x 100
Total birds weighted
2. CV % = (High weight – low weight) x 100
Avg. wt. X F value
Normal CV % of chicks < 8 %
CV % Uniformity %
5 95.4
6 90.4
7 84.7
8 78.8
9 73.3
10 68.3
11 63.7
12 58.2
13 55.8
14 52
15 49.5

9. ThankYou