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Livestock-Based Farming Systems, Renewable Resources and the Environment |
The experiment was carried out to determine the effect of coconut oil (3, 6 and 9%) on the coefficients of total tract digestibility (CTTAD) of dry matter (DM), crude protein (CP), and ether extract (EE) and nitrogen retention in growing pig at an initial age of 45 days. The control treatment (SB) is based on maize and soybean meal. The treatment 3% (CO3) is based on maize and head and bone catfish by-product plus 3% of coconut oil of diet DM. The treatment 6% (CO6) is based on maize and head and bone catfish by-product plus 6% of coconut oil. The treatment 9% (CO9) is based on maize and head and bone catfish by-product plus 9% of coconut oil. The four diets were fed to four growing pigs in a 4x4 Latin Square design. There are differences in DMI and CTTAD of all nutrients (DM, CP and EE) between diets (P<0,05). DMI of SB diet (519 g/day) had higher than CO6 (460 g/day) and lowest diets were CO3 and CO6 (P<0.001), but among of them (379 and 331 g/day) was non significant. CTTAD of DM and CP of diets SB was highest (90.2 and 95.2%) with significant compared to the others (P<0.001), but CO3, CO6 and CO9 were non significant (83.4, 90.3 ; 82.1, 89.4 ; 82.9, 89.4% ; respectively). In contrast, CTTAD of EE of diet CO9 was highest (93,9%) and significant (P<0.02) compared with SB (89,9%), howerver, CO3 and CO6 (90,7 and 90,8%) were not significant with the rest. Nitrogen balance were significant between diets (P<0.001) and shown in Table . In which, diets of SB had highest with nitrogen intake and nitrogen retetion (11,7 and 6,61 g/day), and lowest in treatment with supplemented coconut oil at 9% (7.66 and 2.46%). Diets based on catfish by-products to complement with coconut oil at 6% was increased nitrogen intake upto (10.5 g/day). But this also resulted in nitrogen in faeces and urinary also high (1.06 and 5.62 g/day), therefore, retention reduced (3.84 g/day). It can be concluded that the total tract apparent digestibility of dry matter, crude protein, and ether extract and N retention was highest in the diet with maize and soybean meal and lowest in the diet with supplemented coconut oil at 9%bone and head by-product meal.