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An 8-week feeding trial was conducted to assess the effect of soybean meal (SBM), groundnut meal (GNM) and blood meal (BM) addition in diets with or without (1%) fishmeal on the performance, N-digestibility and cost of production of growing grasscutters. Fifty-four grasscutters (9-week-old) of mixed sexes were randomly assigned to six dietary treatments, using a completely randomized design (CRD) in a 2  3 factorial arrangement, with three grasscutters per treatment and three replicates each. Treatments 1-3 (T1-T3) contained no fishmeal, whilst treatments 4-6 (T4-T6) had 1% fishmeal added. The diets were formulated to be isocaloric and isonitrogenous. N-digestibility was significantly high for SBM diets with or without fishmeal, 83.91% and 82.19%, respectively, followed by BM diets. Average daily gain (ADG) was significantly (P < 0.05) high (12.95 g) for BM diet without fishmeal. Feed cost per kg diet was the lowest (US$0.195) for the same BM diet. The results indicated that the inclusion of SBM and BM in the diet of grasscutters with or without 1% fishmeal could improve performance and it may be the most economical for feeding BM in the diet without fishmeal.

Influence of Three Protein Sources on Performance of Grasscutters (Thryonomys swinderianus) Fed Diets with or without Fishmeal