This study compared ensiled sorghum (ES) from two varieties (first and second cuts) with corn silage (CS) for chemical analysis, total-tract nutrient digestibility, ruminal variables and blood biochemistry metabolites in sheep. Five experimental silages representing first cut ES var. Pegah (PS1), second cut ES var. Pegah (PS2), first cut ES var. Speedfeed (SS1), second cut ES var. Speedfeed (SS2) and CS were assessed for chemical analysis, silage fermentation and anti-quality compounds. Diets consisted of lucerne hay, silage and a premix (at the ratio of 53.5:46:0.5 on a dry matter [DM] basis). Feed consumption, total-tract nutrient digestibility, microbial nitrogen supply (MNS), ruminal variables and blood biochemistry metabolites were determined in a Latin square design of five periods with five male sheep. Compared to sorghum, CS had lower (p < 0.01) concentrations of ash, water-soluble carbohydrates and crude protein, but higher starch, lignin (sa), non-structural carbohydrates and apparent nutrient digestibility. The measurements of pH, lactic acid, NH₃-N and volatile fatty acids (VFA) confirmed that all silages were well-preserved. The anti-quality compound levels in the silages were below the safe limits for ruminants. No differences were observed in feed consumption (p > 0.05) and total-tract digestibility of DM and nutrients (p > 0.05). Rumen pH, NH₃-N, VFA concentrations and acetate to propionate ratio showed no difference among treatments (p > 0.05). Sheep fed on sorghum silage showed a decrease (p < 0.01) in total protozoa, and particularly in the Entodiniae population. There were no differences in cellulolytic bacteria counts (p > 0.05) among treatments. Urinary N, MNS and blood biochemistry metabolites showed no difference among treatments (p > 0.05). Silages from both cuts of sorghum had comparable total-tract nutrient digestibility to CS, therefore, these varieties could be used as a more drought resilient silage source in the feeding of sheep.

中文翻译：

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高粱青贮对羊的营养价值

本研究比较了来自两个品种（第一次和第二次切割）的青贮高粱 (ES) 与玉米青贮饲料 (CS) 的化学分析、全道养分消化率、瘤胃变量和羊的血液生化代谢物。五个实验青贮代表第一次切割 ES 变种。Pegah (PS1)，第二次剪辑 ES 变种。Pegah (PS2)，第一次删减 ES 变种。Speedfeed (SS1)，第二次切割 ES var。Speedfeed (SS2) 和 CS 进行了化学分析、青贮发酵和抗质量化合物的评估。日粮包括苜蓿干草、青贮饲料和预混料（以干物质 [DM] 为基础的比例为 53.5:46:0.5）。饲料消耗、全道养分消化率、微生物氮供应 (MNS)、瘤胃变量和血液生化代谢物在五个时期的拉丁方设计中确定，五只雄性绵羊。与高粱相比，CS 的 (p  < 0.01) 灰分、水溶性碳水化合物和粗蛋白的浓度，但淀粉、木质素 (sa)、非结构性碳水化合物和表观营养消化率更高。pH、乳酸、NH ₃ -N 和挥发性脂肪酸 (VFA) 的测量证实所有青贮饲料都保存完好。青贮饲料中的抗质量化合物水平低于反刍动物的安全限值。在饲料消耗（没有观察到差异p  > 0.05）和DM和营养物（总-消化率p  > 0.05）。瘤胃 pH、NH ₃ -N、VFA 浓度和乙酸与丙酸盐的比例在处理之间没有差异（p  > 0.05）。以高粱青贮饲料喂养的绵羊显示出减少（p < 0.01) 在所有原生动物中，特别是在Entodiniae种群中。 处理之间的纤维素分解细菌计数没有差异 ( p > 0.05)。尿 N、MNS 和血液生化代谢物在治疗之间没有差异（p  > 0.05）。两种高粱切片的青贮饲料具有与 CS 相当的全道养分消化率，因此，这些品种可用作羊饲养中更具抗旱性的青贮饲料来源。