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irds was also 15 % higher than that of birds on the HM3.2A diet. This pattern was repeated at 41d ofage, with birds on WW having gizzards that were 8 % heavier than that obtained with the HM3.2Adiet. There were no significant differences between the groups in the weight of the other organsmeasured at the two ages.Table 3.18: Digestive organ weights (g/kg live-weight) of as-hatched broilers at 21 and 41d.HM3.2A HM3.2 HM35 HM55 RM35 RM55 WW SEM 221 dProventriculus 4.2 c 5.1 ab 4.6 bc 5.1 ab 5.3 a 5.0 ab 5.0 ab 0.18**Gizzard 16.1 b 18.6 a 18.9 a 18.3 ab 20.0 a 18.1 ab 19.0 a 0.79*Liver 30.6 31.6 32.6 35.6 33.4 33.7 33.3 1.32 nsTotal tract 3 93.3 99.5 99.3 103.1 102.7 100.3 101.6 2.41 ns41 dProventriculus 3.1 3.2 3.1 3.1 3.0 3.3 3.2 0.17 nsGizzard 10.5 10.8 10.7 10.9 10.8 10.5 11.4 0.58 nsLiver 23.8 24.6 24.6 25.7 22.7 25.5 24.5 1.16 nsTotal tract 3 64.9 67.2 66.3 66.4 59.3 64.4 62.4 2.27 nsabc Values within rows with unlike superscripts are significantly different (P