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Summary This study aimed to investigate the effects of modified-dietary fiber from cassava pulp (M-DFCP), mostly classified as insoluble dietary fiber (IDF), as a feed supplement on productive performance, nutrient digestibility, weight of digestive organs, abdominal fat storage, and cholesterol in meat and blood of broiler chickens. A total of 336 one-day-old male broiler chickens (Ross 308) were allocated to 4 groups in 7 replicate pens with 12 chicks each, based on a completely randomized design. Four dietary treatments composed of control and 3 M-DFCP inclusion levels: 0.5, 1.0, and 1.5%. The results showed that M-DFCP showed no negative effects on growth performance in broiler chickens. The inclusion of M-DFCP in diets at 1.0 to 1.5% had positive effects on increased gizzard weight, reduced gizzard pH, and reduced abdominal fat. The M-DFCP at 1.0% can also increase nutrient digestibility (dry matter, organic matter, and ether extract). In addition, the supplementation of M-DFCP at 1.0 to 1.5% in diets represented lower cholesterol in serum, breast and thigh meats, and liver of broiler chickens. In conclusion, these results indicate that M-DFCP can be used as an IDF source in broiler diets. The inclusion of 1.0% M-DFCP in broiler diet has positive effects on enhancing gizzard function, improving nutrient digestibility, and reducing abdominal fat and cholesterol in chicken meat, blood, and liver.

SUMMARY This study was conducted to investigate the effects of using cassava pulp fermented with Aspergillus oryzae as feed ingredient substitution to improve nutritive values in laying hen diets. In experiment I, a total of 48 laying hens (Isa Brown) was placed in individual cages to measure nutrient digestibility for 10 days. Six dietary treatments were control and fermented cassava pulp (FCP)-substituted diets at 8, 16, 24, 32, or 40%, respectively. The results showed that FCP can be used in laying hen diets up to 32% without showing negative effects on nutrient digestibility or retention. In experiment II, a total of 192 laying hens was randomly distributed to 4 dietary treatments: control and FCP substitution diets at 16, 24, or 32% through 8 weeks. All FCP substitution levels had no effect on feed intake or egg weight. Egg production was significantly decreased when FCP was used at levels of 32%. Feed conversion ratio, egg mass, and protein efficiency ratio decreased linearly (P ≤ 0.05) as FCP was increased in the diets. However, FCP had no detrimental effect on egg quality, except for the egg yolk color being linearly decreased with increasing the pulp in diets (P ≤ 0.05). The biochemistry profiles revealed FCP had no effect on the enzyme activities of aspartate aminotransferase or alanine aminotransferase, cholesterol, or total immunoglobulin in laying hens. In conclusion, FCP can be used in laying hen diets up to 24% without showing negative effects on nutrient digestibility, egg production, egg quality, or blood biochemistry.