Cup versus tray excreta collections in metabolizable energy assays.

A cup-and-harness excreta collection device was compared with a traditional tray-type excreta collection method in an ME study. The AME and AMEn were determined for two different diets (12% CP, 3,160 kcal ME/kg, and 23% CP, 3,160 kcal/kg). Twenty-four broiler breeder males were used with methods and diets arranged in a 2 x 2 factorial design. A standard AME feeding and collection protocol was followed. There were no differences in any measured variables attributable to method of excreta collection. However, dietary differences were readily apparent with both methods. Data suggest less variability in collection-related variables for the cup collection procedure. Ease and rapidity of changing containers makes the cup collection method a viable alternative when large numbers of birds are involved. Excreta can be stored in the same containers in which it is collected. Additionally, contamination of excreta with feathers, feed, scale, and vomit are avoided.