50 50 Maintaining optimal body weight and uniformity is crucial for health, productivity, and overall welfare. Proper management of these aspects ensures optimal performance. Weigh a minimum of 100 birds for a representative sample. Mean body weight: Calculate the average body weight of the flock. Weigh birds weekly until 30 weeks of age, then monthly. Uniformity: Determine the percentage of birds within ± 10% of the mean body weight. Aim for at least 85% uniformity. Weigh birds at the same time, preferably in the afternoon. Coefficient of Variation (CV): Calculate the CV, with a target of below 8%. WEIGHING PROTOCOL BODY WEIGHT RECORDING METHODS FOR EVALUATING BODY WEIGHT AND UNIFORMITY EXAMPLE Weigh 100 birds and place marker in correct section. Calculate average body weight: 100 pullets weighed a total of 90.800 g 90.800 g divided by 100 birds = 908 g / bird Determine the uniformity: 908 g x 10% = 91 g 908 g + 91 g = 999 g –> upper value 908 g – 91 g = 817 g –> lower value 85 birds weighed within the 817 g – 999 g range 85 divided by 100 times 100 = 85 % uniformity EXAMPLE OF CALCULATING BODY WEIGHT AND UNIFORMITY LOHMANN › MANAGEMENT GUIDE › EARLY MANAGEMENT
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