本试验旨在测定生长育肥猪木薯的氨基酸表观回肠消化率(AID)和标准回肠消化率(SID),并基于木薯常规营养成分含量建立生长育肥猪必需氨基酸SID的预测模型。选取健康、体重为(36.0±1.4) kg的"杜×长×大"瘘管猪22头,采用2个11×3的不完全拉丁方设计,分别饲喂1种无氮饲粮和10种木薯试验饲粮。结果表明:风干基础下,木薯赖氨酸(Lys)、蛋氨酸(Met)、苏氨酸(Thr)、色氨酸(Trp)含量分别为0.09%~0.24%、0.01%~0.03%、0.05%~0.11%、0.04%~0.07%;10个不同来源木薯中,以产自广西玉林和广西来宾的木薯大部分氨基酸含量较高。生长育肥猪对木薯的AIDLys、AIDMet、AIDThr、AIDTrp分别为54.21%~87.96%、41.33%~84.95%、31.67%~73.14%、74.40%~91.12%,对木薯的SIDLys、SIDMet、SIDThr、SIDTrp分别为69.20%~95.53%、69.62%~97.81%、73.04%~95.44%、84.50%~96.20%。本试验建立了生长育肥猪对木薯SIDTrp、SIDArg、SIDLeu、SIDVal、SIDPhe的预测模型,涉及的关键预测因子包括粗蛋白质(CP)、粗灰分(Ash)、干物质(DM)及中性洗涤纤维(NDF)含量。
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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