Streeter M N, Hill G M, Wagner D G, Owens F N, Hibberd C A
Department of Animal and Dairy Science, University of Georgia, Athens 30602-2771.
J Anim Sci. 1993 Jun;71(6):1648-56. doi: 10.2527/1993.7161648x.
The effects of sorghum type on amino acid digestion were determined by feeding heifers (230 kg) equipped with ruminal, duodenal, and ileal cannulas bird-resistant (BR) or non-BR grains that had a normal or waxy endosperm (NORMAL-BR, WAXY-BR, NORMAL, WAXY). Dry-rolled grain diets were fed at 2% of BW in a 4 x 4 Latin square design. Total (TAA), essential (EAA), and nonessential (NAA) amino acid intake (grams/day) tended to be greater for BR than for non-BR grains. Feed (plus endogenous) amino acids reaching the duodenum were calculated by subtracting amino acids of microbial protein from total flow. Flow (grams/day) of total and feed TAA, EAA, NAA, and proline-rich-protein (sum of aspartate, glutamate, glycine, and proline) to the duodenum was greater (P < .05) for BR than for non-BR grains. The ratio between feed proline-rich-protein and NAA reaching the duodenum was similar to that noted with feed intake. Amino acid disappearance (grams/day) from the small intestine was unchanged (P > .10) by sorghum type, although the digestibility (percentage of duodenal flow) of TAA, EAA, NAA, and most individual amino acids was decreased (P < .05) for BR varieties. Amino acid flow to the cecum (grams/day) was generally greater for NORMAL-BR than for WAXY-BR (P < .10) or for NORMAL (P < .01) and greater (P < .10) for WAXY-BR than for WAXY.(ABSTRACT TRUNCATED AT 250 WORDS)
通过给装有瘤胃、十二指肠和回肠瘘管的小母牛（230千克）饲喂抗鸟（BR）或非抗鸟谷物（NORMAL-BR、WAXY-BR、NORMAL、WAXY）来测定高粱类型对氨基酸消化的影响，这些谷物具有正常或蜡质胚乳。以4×4拉丁方设计，按体重的2%饲喂干碾压谷物日粮。BR谷物的总氨基酸（TAA）、必需氨基酸（EAA）和非必需氨基酸（NAA）摄入量（克/天）往往高于非BR谷物。通过从总流量中减去微生物蛋白的氨基酸来计算到达十二指肠的饲料（加上内源性）氨基酸。BR谷物到达十二指肠的总TAA、EAA、NAA和富含脯氨酸蛋白（天冬氨酸、谷氨酸、甘氨酸和脯氨酸的总和）的流量（克/天）高于非BR谷物（P<0.05）。到达十二指肠的饲料富含脯氨酸蛋白与NAA的比例与采食量时的比例相似。高粱类型对小肠中氨基酸消失量（克/天）没有影响（P>0.10），尽管BR品种的TAA、EAA、NAA和大多数单个氨基酸的消化率（十二指肠流量的百分比）有所降低（P<0.05）。NORMAL-BR到达盲肠的氨基酸流量（克/天）通常高于WAXY-BR（P<0.10）或NORMAL（P<0.01），WAXY-BR高于WAXY（P<0.10）。（摘要截短于250字）
