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Beef cattle feeding costs as impacted by hay yield and quality
Agronomy Journal ( IF 2.1 ) Pub Date : 2021-07-10 , DOI: 10.1002/agj2.20806
J. Brett Rushing 1 , Rocky W. Lemus 2 , Joshua G. Maples 3 , J. Daniel Rivera 4 , Johnson C. Lyles 1
Affiliation  

Reducing dependence onstored feed, particularly dry hay, is a major factor in beef cattle production systems in the southeastern United States. Increasing the nutritive value of the hay that is fed, however, can ultimately reduce total feed costs and boost profitability. A field trial was conducted in east-central Mississippi evaluating several warm-season perennial grass hay crops under varying N and harvest regimes in order to assess their ability to meet beef cow nutritional demands and to estimate total feed costs. Cultivars included ‘Argentine’ (ARG) and ‘Pensacola’ (PEN) bahiagrass (Paspalum notatum Flueggé), ‘Common’ (COM) and ‘Cheyenne II’ (CHE) bermudagrass (Cynodon dactylon L.), and ‘Pete’ (PET) eastern gamagrass (Tripsacum dactyloides L.). Plots were assigned to an annual N treatment (0, 112, 224, 336, or 448 kg N ha−1 yr−1) and a harvest frequency (30, 40, 60, and 120 d). Argentine produced the greatest amount of forage mass (FM) at the 448 kg N ha−1 yr−1 rate (14,422 kg DM ha−1). Increasing N rates resulted in greater mean crude protein (CP) values, whereas harvest frequency had a greater impact on total digestible nutrients (TDN). Total feed costs were calculated based on field trial data and were combined with either soybean [Glycine max (L.) Merr.] hulls (SH) or corn (Zea mays L.) gluten (CG) to match nutritional demand. The most economical feed costs were those where hay was fertilized (>224 kg N ha−1 yr−1) and harvested three or more times a year and was combined with CG.

中文翻译:

受干草产量和质量影响的肉牛饲养成本

减少对储存饲料的依赖,尤其是干草,是美国东南部肉牛生产系统的一个主要因素。然而,提高饲喂干草的营养价值,最终可以降低总饲料成本并提高盈利能力。在密西西比州中东部进行了一项田间试验,在不同的氮肥和收获方式​​下评估了几种暖季多年生牧草作物,以评估它们满足肉牛营养需求的能力并估算总饲料成本。栽培品种包括“阿根廷”(ARG)和“彭萨科拉”(PEN)巴伊亚草(Paspalum notatum Flueggé)、“Common”(COM)和“Cheyenne II”(CHE)百慕大草(Cynodon dactylon L.)和“Pete”(PET) ) 东部 gamagrass ( Tripsacum dactyloidesL.)。地块被分配到每年一次的氮处理(0、112、224、336 或 448 kg N ha -1  yr -1)和收获频率(30、40、60 和 120 天)。阿根廷以 448 kg N ha -1  yr -1 的速率(14,422 kg DM ha -1)生产了最大量的牧草质量(FM )。增加 N 率导致更高的平均粗蛋白 (CP) 值,而收获频率对总可消化营养素 (TDN) 的影响更大。根据田间试验数据计算总饲料成本,并结合大豆 [ Glycine max (L.) Merr.] 壳 (SH) 或玉米 ( Zea maysL.) 面筋 (CG) 以匹配营养需求。最经济的饲料成本是那些对干草进行施肥(>224 kg N ha -1  yr -1)并每年收获三次或更多次并与 CG 结合的饲料成本。
更新日期:2021-07-10
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