Abstract This study aimed to investigate the effects of dietary rumen undegradable protein (RUP) level and supplemental rumen protected conjugated linoleic acid (rpCLA) on performance, nutrient digestibility, rumen fermentation, urinary purine derivatives and plasma metabolites in growing kids. Thirty-two Kurdish kids (13.06 ± 1.08 kg BW) were fed diets differing in RUP level (low = 250 vs. high = 350 g/kg of dietary CP) supplemented either with 15 g/kg rpCLA or 12 g/kg of hydrogenated soybean oil (HSO). The experiment was lasted for 100 days including a 20-d of adaptation period. Goat kids fed diet containing high RUP supplemented with rpCLA had the lowest dry matter intake, but the greatest average daily gain and feed efficiency compared to the other groups (P ≤ 0.05). The interaction of dietary RUP level and rpCLA supplementation had no effect on organic matter, crude protein and ether extract digestibility and ruminal fermentation parameters (P > 0.05). Goat kids fed diet containing high RUP supplemented with HSO had the greatest plasma concentration of triglycerides compared to the other groups (P ≤ 0.05). Urinary uric acid and allantoin concentrations were not influenced by the experimental diets (P > 0.05). In conclusion, feeding diet containing high RUP level supplemented with 15 g/kg rpCLA improved production performance of growing goat kids.

中文翻译：

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日粮瘤胃不可降解蛋白水平和补充瘤胃保护共轭亚油酸对生长山羊仔猪生产性能的影响

摘要 本研究旨在研究日粮瘤胃不可降解蛋白 (RUP) 水平和补充瘤胃保护共轭亚油酸 (rpCLA) 对生长儿童的生产性能、营养消化率、瘤胃发酵、尿嘌呤衍生物和血浆代谢物的影响。32 名库尔德儿童 (13.06 ± 1.08 kg BW) 被喂食不同 RUP 水平的饮食（低 = 250 vs. 高 = 350 g/kg 饮食 CP）补充有 15 g/kg rpCLA 或 12 g/kg 氢化物大豆油 (HSO)。实验持续100天，包括20天的适应期。与其他组相比，饲喂含有高 RUP 和 rpCLA 的日粮的山羊儿童干物质摄入量最低，但平均日增重和饲料效率最高（P ≤ 0.05）。日粮 RUP 水平和 rpCLA 补充的相互作用对有机质、粗蛋白和乙醚提取物的消化率和瘤胃发酵参数没有影响（P > 0.05）。与其他组相比，喂食含有高 RUP 并辅以 HSO 的饮食的山羊孩子的甘油三酯血浆浓度最高（P ≤ 0.05）。尿尿酸和尿囊素浓度不受实验饮食的影响（P > 0.05）。总之，饲喂含有高 RUP 水平并辅以 15 g/kg rpCLA 的日粮提高了生长山羊的生产性能。与其他组相比，喂食含有高 RUP 并辅以 HSO 的饮食的山羊儿童的甘油三酯血浆浓度最高（P ≤ 0.05）。尿尿酸和尿囊素浓度不受实验饮食的影响（P > 0.05）。总之，饲喂含有高 RUP 水平并辅以 15 g/kg rpCLA 的日粮提高了生长山羊的生产性能。与其他组相比，喂食含有高 RUP 并辅以 HSO 的饮食的山羊儿童的甘油三酯血浆浓度最高（P ≤ 0.05）。尿尿酸和尿囊素浓度不受实验饮食的影响（P > 0.05）。总之，饲喂含有高 RUP 水平并辅以 15 g/kg rpCLA 的日粮提高了生长山羊的生产性能。