An experiment including a [1-13C]leucine isotope dilution and a nitrogen balance were carried out to determine the effect of feeding plantain herb (Plantago lanceolata L.) on whole body protein synthesis (WBPS) and degradation in sheep kept at thermoneutral temperature (20°C) or exposed to heat (30°C). The animals were fed either mixed hay of orchardgrass and reed canarygrass (Hay-diet) or Hay-diet and plantain (9:1) (PL-diet) at maintenance level using a crossover design. Nitrogen intake was higher (p < 0.0001) for the Hay-diet than for the PL-diet, but N balance remained similar between diets and was higher (p = 0.003) during heat exposure than at thermoneutral temperature. The WBPS was numerically lower (p = 0.10) for the PL-diet than for the Hay-diet. The direction of the response to heat exposure differed (p = 0.04) between diets: after feeding the PL-diet the WBPS increased from 15.2–16.9 g · kgW−0.75 · d−1, whereas it decreased after feeding the Hay-diet from 17.5–16.6 g · kgW−0.75 · d−1. The present results suggest that the PL-diet may have a positive impact for WBPS during heat exposure, and could be used for rearing sheep as an alternative to the Hay-diet.

中文翻译：

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受热绵羊全身蛋白质合成和降解对车前草草本植物的反应

进行了包括 [1-13C] 亮氨酸同位素稀释和氮平衡的实验，以确定饲喂车前草 (Plantago lanceolata L.) 对保持在热中性温度下的绵羊全身蛋白质合成 (WBPS) 和降解的影响。 20°C) 或受热 (30°C)。使用交叉设计在维持水平下给动物喂食果园和芦苇混合干草（干草饮食）或干草饮食和车前草（9:1）（PL饮食）。干草饮食的氮摄入量高于 PL 饮食的氮摄入量（p < 0.0001），但饮食之间的氮平衡保持相似，并且在热暴露期间比在热中性温度下更高（p = 0.003）。PL 饮食的 WBPS 在数值上低于干草饮食 (p = 0.10)。不同饮食对热暴露的反应方向不同（p = 0.04）：喂食 PL 日粮后，WBPS 从 15.2–16.9 g · kgW−0.75 · d−1 增加，而喂食干草饲料后，WBPS 从 17.5–16.6 g · kgW−0.75 · d−1 下降。目前的结果表明，PL 饮食可能对热暴露期间的 WBPS 产生积极影响，并可用于饲养绵羊，作为干草饮食的替代品。