樱桃谷公鸭对玉米DDGS能量、蛋白质和氨基酸利用率的研究

Study on Energy,Protein and Amino Acid Utilization of Corn DDGS by Cherry Valley Male Ducks

【目的】研究樱桃谷公鸭对5个地区玉米DDGS的能量、蛋白质和氨基酸的利用率。【方法】将98只18周龄体重3.25 kg±0.25 kg的健康樱桃谷公鸭随机分为7组,每组14只,1只为1个重复,单只饲养于代谢笼。其中,5个试验组分别饲喂吉林、美国(粗)、美国(细)、山东和辽宁玉米DDGS与玉米淀粉按7∶3配制成的试验饲粮;玉米淀粉组饲喂100%玉米淀粉饲粮;内源组禁食。按强饲流程进行公鸭强饲试验和代谢试验,收集全部排泄物。测定强饲饲料及排泄物的总能、粗蛋白质和氨基酸等养分含量。【结果】辽宁玉米DDGS粗蛋白质含量显著低于其他4个试验组(P<0.05),美国(粗和细)玉米DDGS粗蛋白质含量显著低于吉林组(P<0.05)。美国(粗)玉米DDGS总能显著低于其他4个试验组(P<0.05)。美国(细)、辽宁组表观可利用蛋白质和真可利用蛋白质较美国(粗)、山东组均显著提高(P<0.05)。美国(粗)、辽宁组表观代谢能和真代谢能均显著高于吉林、山东组(P<0.05)。辽宁玉米DDGS苏氨酸、甘氨酸、组氨酸、精氨酸、支链氨基酸、苯丙氨酸和酪氨酸真可利用率均显著高于其他4个试验组(P<0.05),脯氨酸、天冬氨酸、丝氨酸、谷氨酸和丙氨酸5种非必需氨基酸真可利用率最高。【结论】5个不同地区玉米DDGS营养成分及能量、蛋白质和氨基酸利用率具有较大差异。樱桃谷公鸭的能量、蛋白质、氨基酸利用率排序为辽宁>美国(细)>美国(粗)>吉林>山东,5个不同地区玉米DDGS粗蛋白质含量排序为山东>吉林>美国(粗)>美国(细)>辽宁。

【Objective】To explore the utilization of energy,protein and amino acid of the corn DDGS from 5 regions for Cherry Valley male ducks.【Method】Ninety-eight healthy Cherry Valley male ducks with a body weight of 3.25 kg±0.25 kg at 18 weeks of age were cultivated in metabolic cages,one duck one cage.They were randomly divided into 7 groups comprised of 14 individuals and 1 per replicate.The ducks in 5 experimental groups were fed the diets with corn DDGS and corn starch at a ratio of 7∶3,and the DDGS were sourced from Jilin,the United States(crude),the United States(fine),Shandong and Liaoning,respectively.The ducks in corn starch group were fed on the 100%corn starch diet,while in endogenous group was fed nothing.According to the process of force-feeding,both force-feeding test and metabolic test were carried out,with all the excrement collected.Moreover,gross energy(GE),crude protein(CP)and the amino acid content of force-feeding feed and excreta were determined.【Result】The CP content of corn DDGS sourced from Liaoning was significantly lower compared to the other 4 experimental groups(P<0.05),while the CP content of crude and fine corn DDGS sourced from the United States was significantly lower relative to the Jilin group(P<0.05).The GE of DDGS from the United States(crude)was significantly lower compared to the other 4 experimental groups(P<0.05).The apparently available protein and truly available protein in the United States(fine)and Liaoning groups were significantly higher than those from the United States(crude)and Shandong groups(P<0.05).The apparently metabolizable energy and truly metabolizable energy in the United States(crude)and Liaoning groups were significantly higher than in Jilin and Shandong groups(P<0.05).The true availability of threonine,glycine,histidine,arginine,branch chain amino acid,phenylalanine and tyrosine of corn DDGS from Liaoning was significantly higher compared to the other 4 experimental groups(P<0.05),and the true availability rates of proline,aspartic acid,serine,glutamic acid and alanine were the highest.【Conclusion】There were significant differences observed in nutritional composition,energy,protein and amino acid utilization of corn DDGS among 5 different regions.The utilization of energy,protein and amino acid by Cherry Valley male ducks was in the following order:Liaoning>United States(fine)>United States(crude)>Jilin>Shandong.The crude protein content of corn DDGS in five different regions was ranked as Shandong>Jilin>United States(crude)>United States(fine)>Liaoning.