This research was conducted to determine the effect of crude fiber level in rations of gizard weight, length and weight of small intestine, caecum, colon drake. Research using a completely randomized design consisting of four treatment levels of crude fiber (5, 10, 15, and 20%) and repeated four times. Data analysis of variance test results and continue testing the average value with Duncan Multiple Range Test. Ducks 3 weeks old experiment as much as 64 tail is divided into four treatments and each treatment consisted of four ducks. All treatments formulated rations containing protein (16%) and ME (2600 kcal/kg) is the same. The main source of crude fiber in the diet is fine bran. The results showed significantly different levels of crude fiber (P <0.05) to the length of small intestine drake. Keywords: Ducks male, Fiber, Carcas, Visceral Organ.
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