This experiment was conducted to determine the apparent ileal digestibility (AID) and standardized ileal digestibility (SID) of amino acids of cassava for growing-finishing pigs, and to develop prediction model for SID of essential amino acids of cassava based on its conventional nutrient contents. Twenty-two healthy Duroc×Landrance×Yorkshire ileal-cannulated pigs with the body weight of (36.0±1.4) kg were randomly selected and assigned to 10 cassava diets and a nitrogen-free diet according to a replicated incomplete Latin square design of 11×3. The results showed that, on the air-dry basis, the contents of lysine (Lys), methionine (Met), threonine (Thr), tryptophan (Trp) in cassava were 0.09% to 0.24%, 0.01% to 0.03%, 0.05% to 0.11%, 0.04% to 0.07%, respectively. Among the cassavas from 10 producing areas, most of amino acids in the cassavas from Yulin and Laibing of Guangxi had higher content. The AIDLys, AIDMet, AIDThr, AIDTrp of cassava for growing-finishing pigs were 54.21% to 87.96%, 41.33% to 84.95%, 31.67% to 73.14%, 74.40% to 91.12%, respectively, and the SIDLys, SIDMet, SIDThr, SIDTrp were 69.20% to 95.53%, 69.62% to 97.81%, 73.04% to 95.44%, 84.50% to 96.20%, respectively. The prediction models for SIDTrp, SIDArg, SIDLeu, SIDVal and SIDPhe in cassava for growing-finishing pigs are established in this experiment, and the key predicting factors include crude protein (CP), ash (Ash), dry matter (DM) and neutral detergent fiber (NDF) contents.
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