Urochloa hybrids produce large amounts of biomass and have drought tolerance; however, there are few reports on the forage yield and quality of these forage grasses in semi‐arid environments. We evaluated the forage yield and nutritional value of Urochloa hybrids (‘Mulato II’, ‘Cayman’ and ‘Cobra’) and Pennisetum ciliare ‘H‐17’ (control) at three regrowth ages (RA: 4, 6 and 8 weeks), at maximum (MAR) and minimum (MIR) rainfall periods in semi‐arid climate. The variables evaluated were as follows: dry matter of leaves (DMl), stems (DMs), and total (DMT), crude protein (CP), in vitro dry matter digestibility (IVDMD) and detergent fibers (neutral: NDF, and acid: ADF). The hybrids showed higher DMl, CP and IVDMD with values of 423 g/m², 11% and 70%, respectively. ‘H‐17’ presented higher DMs, NDF and ADF, with values of 110 g/m², 69% and 35%, respectively. Urochloa hybrids showed higher forage yield and nutritional value compared to Pennisetum ciliare ‘H‐17’ and could be an alternative for semi‐arid zones.

中文翻译：

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半干旱条件下不同重生年龄的'H-17'和Urochloa杂种的牧草产量和品质

Urochloa杂种产生大量生物量并具有耐旱性。然而，关于半干旱环境下这些牧草的牧草产量和质量的报道很少。我们评估了三个重生年龄（RA：4、6和8周）的Urochloa杂种（'Mulato II'，'Cayman'和'Cobra'）和纤毛草'H-17'（对照）的饲草产量和营养价值。，在半干旱气候的最大（MAR）和最小（MIR）降雨期。评估的变量如下：叶片干物质（DM1），茎干（DMs）和总干物质（DMT），粗蛋白（CP），体外干物质消化率（IVDMD）和去污剂纤维（中性：NDF和酸：ADF）。杂种显示出较高的DM1，CP和IVDMD，值为423 g / m ²，分别为11％和70％。'H-17'呈现较高的DM，NDF和ADF，用110克/平方米的值²分别为69％和35％。与纤毛象草'H-17'相比，Urochloa杂种表现出更高的草料产量和营养价值，并且可以替代半干旱地区。