Abstract：
Eight geldings weighing 544 ± 16 kg were used to evaluate feeding a postexercise protein meal on plasma amino acids during recovery. Horses were fed sweet feed, corn, grass hay and equal amounts of a protein pellet (32% CP) with meals (MP group) or postexercise (EP group). Horses exercised 1-2 h/day, 5 days/week, for 12 weeks. A pre and poststudy 4 days total urine and feces collection was conducted. Urine and fecal samples were analyzed for nitrogen (N) to calculate N balance. Blood samples were drawn immediately after and at 1 and 3 h postexercise at the start and end of the study for plasma amino acid concentrations. Absorbed N and N retention were greater for the MP group compared to the EP group (p = 0.038, 0.033 respectively). An interaction revealed an increase in fecal N (p = 0.01) and decreased N digestibility for the MP group compared to the EP group at the end of the study. Plasma concentrations for 8 out of 14 amino acids were less for the EP group immediately after exercise compared to the MP group (p < 0.02). Plasma concentrations of lysine and arginine were greater for the EP group compared to the MP group at 1 and 3 h after exercise (p < 0.05 and 0.04 respectively). Changes were different for 8 out of the 14 amino acids immediately post exercise, 7 out of 14 amino acids at 1 h postexercise and 10 out of 14 amino acids at 3 h postexercise with positive changes for the EP group and negative changes for the MP group. The EP group had improved supply of plasma amino acids in the recovery period that sustained for 3 h postexercise and are indicative of better amino acid supply supporting muscle development.
摘要：
使用八种重544±16kg的凝胶来评估在恢复过程中在血浆氨基酸上喂养运动后蛋白质餐。马被喂甜饲料，玉米,草干草和等量的蛋白质颗粒（32％CP）与膳食（MP组）或运动后（EP组）。马每天锻炼1-2小时，5天/周,12周。进行研究前和研究后4天的总尿液和粪便收集。分析尿液和粪便样品的氮(N)以计算N平衡。在研究开始和结束时，在运动后1和3小时立即抽取血样，以测定血浆氨基酸浓度。与EP组相比，MP组的吸收N和N保留更大（分别为p=0.038，0.033）。在研究结束时，与EP组相比，MP组的粪便N增加（p=0.01）和N消化率降低。与MP组相比，EP组运动后立即14个氨基酸中的8个的血浆浓度较低（p<0.02）。运动后1和3小时，EP组的血浆赖氨酸和精氨酸浓度高于MP组（分别为p<0.05和0.04）。运动后立即14种氨基酸中的8种变化不同，运动后1小时14个氨基酸中有7个，运动后3小时14个氨基酸中有10个，EP组呈阳性变化，MP组呈阴性变化。EP组在运动后3小时的恢复期血浆氨基酸供应增加，表明支持肌肉发育的氨基酸供应更好。
