摘要
Two experiments were designed to determine the N and AA digestibility of various protein sources (potato protein concentrate, soy protein concentrate, soy protein isolate, linseed meal, sunflower meal, cottonseed meal, canola meal, and camelina meal) fed to growing pigs. In each experiment, barrows were surgically fitted with a simple T-cannula at the distal ileum and fed 4 experimental diets and a N-free diet (NFD) on the basis of a replicated 5 × 2 crossover arrangement with 5 diets and 2 periods. For Exp. 1, 20 cannulated 25-kg barrows received potato concentrate, soy concentrate, soy isolate, and linseed meal. The apparent ileal digestibility (AID) and standardized ileal digestibility (SID) of N for potato concentrate, soy concentrate, and soy isolate were similar and greater than that for linseed meal (P < 0.05). The AID and SID of Leu and Thr were greater in potato protein concentrate than soy concentrate (P < 0.05), and AID and SID of Thr were lower in soy isolate than potato concentrate. The AID and SID of all essential AA were similar between soy isolate and soy concentrate. Linseed meal had the lowest AID and SID of N and AA digestibility among protein sources (P < 0.05). In Exp. 2, sunflower meal, cottonseed meal, canola meal, and camelina meal were fed to 42-kg barrows to determine their AID and SID of AA. The AID and SID of N and all AA were greatest for sunflower meal (P < 0.05), and canola meal had similar AID and SID of N, Met, Thr, Leu, and Val. The AID and SID of all essential AA, except for Met and Trp, were lowest for sunflower meal (P < 0.05). Cottonseed meal had lower AID and SID for Lys, Ile, Leu, Met, Thr, and Val compared with the other protein sources (P < 0.05). In conclusion, the digestibility of N and AA varies greatly among oilseed meals.
摘要译文
设计了两个实验来确定各种蛋白质来源的N和AA消化率（马铃薯浓缩蛋白，大豆浓缩蛋白，大豆分离蛋白，亚麻籽粉，向日葵粉，棉籽粕，双低菜粕和亚麻荠（Camelina meal））喂养生长猪。在每个实验中，在回肠末端用外科手术配备一个简单的T型套管，并在复制的5×2交叉配置和5种饮食和2个周期的基础上喂养4种实验饮食和无氮饮食（NFD）。对于Exp。 1,200只插管的25公斤阉猪接受马铃薯浓缩物，大豆浓缩物，大豆分离物和亚麻籽粉。马铃薯浓缩物，大豆浓缩物的N的表观回肠消化率（AID）和标准回肠消化率（SID）和大豆分离物相似并且大于亚麻籽粉（P 0.05）。 Leu和Thr的AID和SID在马铃薯蛋白浓缩物中比大豆浓缩物中更高（P 0.05），并且大豆分离物中Thr的AID和SID低于马铃薯浓缩物。所有必需的AA的AID和SID在大豆分离物和大豆浓缩物之间是相似的。亚麻籽粉在蛋白质来源中具有最低的AID和SID，N和AA消化率（P 0.05）。在Exp。 2，葵花籽粉，棉籽粕，双低菜粕，和骆驼菜粉喂给42公斤的阉牛，以确定它们的AID和SID。葵花粕中氮和全氮的AID和SID最大（P 0.05），和双低菜粕具有相似的AID和SID，N，Met，Thr，Leu和Val。葵花粕中除Met和Trp以外的所有必需氨基酸的AID和SID均最低（P 0.05）。与其他蛋白质来源相比，棉籽粕对Lys，Ile，Leu，Met，Thr和Val的AID和SID较低（P 0.05）。结论是，N和AA的消化率在油籽粕中差异很大。