Abstract
The additivity and accuracy of true metabolisable energy values, corrected for nitrogen retention (TME n ), of different diet ingredients previously determined for ostriches, were evaluated by feeding an experimental diet containing a number of these ingredients to ostriches and roosters. The TME n value of the test diet was determined with 36 young ostriches (7 months old) by a balance method of continuous feeding for 5 days after an adaption period of 7 days. The test diet was also offered for 3 days to 10 adult roosters after an adaption period of 24 h. Theoretical values of 11.69±0.189 MJ/kg and 8.28±0.181 MJ/kg calculated for the test diet for ostriches and roosters, respectively, compared well with determined values of 11.25±0.072 MJ/kg and 8.02±0.445 MJ/kg, respectively. It was concluded that reliable energy values are now available for the establishment of energy requirements and diet formulations for ostriches.
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