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Evaluating cover crops forage nutritive value in Oklahoma winter wheat systems
Agronomy Journal ( IF 2.1 ) Pub Date : 2021-05-03 , DOI: 10.1002/agj2.20708
Kyle M. Horn 1 , Alexandre C. Rocateli 1 , Jason G. Warren 1 , Kenneth E. Turner 2 , João A. Antonangelo 1
Affiliation  

Winter wheat (Triticum aestivum L.) is a valuable crop in the southern Great Plains that grows from fall to spring, with fields then typically fallowed through the summer. Adding grazeable cover crops to the fallow period could increase farm profitability. The objective of this study was to determine eight different cover crops’ nutritive value and simulated stocker calf performance. Cover crops were established in late spring 2016 and 2017 in Chickasha and Perkins, OK. At 6 wk after planting, two simulated grazing regimes based on cutting height were used: severe (≤2.5 cm) and recommended (7.5 cm). Legumes had the highest nutritive value in comparison to warm-season grasses and grass–legume mixtures. Legumes resulted in higher simulated daily steer gain (DSG) and total steer gain per area (TSGA) values than grasses and mixtures at Perkins. At this location, legumes had superior forage nutritive value, compensating for lower yields. At Chickasha, grasses and mixtures had higher TSGA values (246.7 ± 6.9 kg ha–1) and lower DSG (0.17 ± 0.04 kg steer–1 d–1) values than legumes (131.6 ± 25.3 kg ha–1 and 0.48 ± 0.02 kg steer–1 d–1). This finding implied that grasses and mixtures with lower individual DSG required much higher stocking rates than legumes to achieve higher TSGA values. This increment in stocking rates could increase costs, drastically decreasing profits. Consequently, legumes might be a viable option due to their balanced forage yield and nutritive value relationship. However, consideration must be given to supplemental energy to better balance the TDN/protein ratio requirements of the stocker calf.

中文翻译:

评估俄克拉荷马州冬小麦系统中覆盖作物的草料营养价值

冬小麦 ( Triticum aestivumL.) 是大平原南部的一种有价值的作物,从秋季到春季生长,然后通常在夏季休耕。在休耕期增加可放牧的覆盖作物可以提高农场的盈利能力。本研究的目的是确定八种不同覆盖作物的营养价值和模拟的饲养犊牛表现。覆盖作物于 2016 年和 2017 年春末在俄亥俄州奇卡沙和珀金斯种植。在种植后 6 周,使用两种基于切割高度的模拟放牧方式:严重(≤2.5 厘米)和推荐(7.5 厘米)。与暖季型草和草豆混合物相比,豆类具有最高的营养价值。在 Perkins,豆类比草和混合物产生更高的模拟每日头增重 (DSG) 和单位面积总头增重 (TSGA) 值。在这个位置,豆类具有较高的草料营养价值,弥补了较低的产量。在奇卡沙,草和混合物具有更高的 TSGA 值(246.7 ± 6.9 kg ha–1 ) 和更低的 DSG (0.17 ± 0.04 kg 阉牛–1 d –1 ) 值比豆类 (131.6 ± 25.3 kg ha –1和 0.48 ± 0.02 kg 阉牛–1 d –1 )。这一发现表明,与豆类相比,具有较低个体 DSG 的草和混合物需要更高的放养率才能获得更高的 TSGA 值。库存率的这种增加可能会增加成本,从而大大降低利润。因此,豆类可能是一种可行的选择,因为它们具有平衡的草料产量和营养价值关系。然而,必须考虑补充能量,以更好地平衡储存犊牛的 TDN/蛋白质比率要求。
更新日期:2021-05-03
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