Annual and seasonal dry matter production, botanical species composition, and nutritive value of multispecies, permanent pasture, and perennial ryegrass swards managed under grazing

IF 2.7 3区农林科学 Q1 AGRONOMY

Grass and Forage Science Pub Date : 2024-09-07 DOI:10.1111/gfs.12691

Jane Shackleton, Tommy M. Boland, Jean Kennedy, Cornelia Grace, Gaspard Beaucarne, Stuart F. Kirwan, Olaf Schmidt, Helen Sheridan

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引用次数: 0

Abstract

Reduced reliance on inputs such as fertilizer is fundamental to sustainable grazing systems. This two‐year study compared four sward types, including multispecies swards (MSS), for herbage dry matter (DM) production, species contribution to DM, and herbage nutritive value under grazing. The systems were: (1) Lolium perenne L. monoculture (PRG; 170 kg N ha−1 year−1); (2) permanent pasture (PP; 135 kg N ha−1 year−1), (3) six species sward consisting of two grasses, two legumes and two herbs (6S; 70 kg N ha−1 year−1), (4) twelve species sward consisting of three grasses, four legumes and five herbs (12S; 70 kg N ha−1 year−1). Herbage samples were collected for DM yield, botanical composition, and nutritive value. Mean annual DM production for PRG, PP, 6S, and 12S was 11,374, 8526, 13,783, and 13,338 kg DM ha−1 respectively. Herb proportions decreased in 6S and 12S from 2020 to 2021 while grass proportions increased. Mean crude protein levels were similar across all systems (p > 0.05), with higher ash content in 6S and 12S compared to PRG (p < 0.001). Organic matter digestibility was lowest in PP compared to PRG (p < 0.001) while neutral detergent fibre content of PP and PRG were greater than 6S and 12S (p < 0.001). Water soluble carbohydrate content was highest in PRG (p < 0.0001). Over 2 years, MSS delivered increased herbage DM yield and nutritive quality relative to PRG and PP swards, from reduced N inputs. However, maintenance of the herb component of MSS is a challenge.

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放牧管理的多物种、永久性牧草和多年生黑麦草的年和季节性干物质产量、植物物种组成和营养价值

减少对肥料等投入的依赖是可持续放牧系统的基础。这项为期两年的研究比较了四种牧草类型（包括多物种牧草（MSS））在放牧条件下的牧草干物质（DM）产量、物种对DM的贡献以及牧草营养价值。这些系统是(1) Lolium perenne L. 单一种植（PRG；170 kg N ha-1 year-1）；(2) 永久牧场（PP；135 kg N ha-1 year-1）；(3) 由两种禾本科植物、两种豆科植物和两种草本植物组成的六种牧草（6S；70 kg N ha-1 year-1）；(4) 由三种禾本科植物、四种豆科植物和五种草本植物组成的十二种牧草（12S；70 kg N ha-1 year-1）。收集垃圾样本以检测 DM 产量、植物成分和营养价值。PRG、PP、6S 和 12S 的年平均 DM 产量分别为 11374、8526、13783 和 13338 千克 DM/公顷-1。从 2020 年到 2021 年，6S 和 12S 的草本比例有所下降，而禾本科比例有所上升。所有系统的平均粗蛋白含量相似（p > 0.05），与 PRG 相比，6S 和 12S 的灰分含量更高（p < 0.001）。与 PRG 相比，PP 的有机物消化率最低（p <0.001），而 PP 和 PRG 的中性洗涤纤维含量高于 6S 和 12S （p <0.001）。水溶性碳水化合物含量在 PRG 中最高（p < 0.0001）。与 PRG 和 PP 牧草相比，MSS 在两年中通过减少氮的投入提高了牧草 DM 产量和营养质量。然而，如何保持 MSS 的草本成分是一项挑战。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Grass and Forage Science 农林科学-农艺学

CiteScore

5.10

自引率

8.30%

发文量

审稿时长

12 months

期刊介绍： Grass and Forage Science is a major English language journal that publishes the results of research and development in all aspects of grass and forage production, management and utilization; reviews of the state of knowledge on relevant topics; and book reviews. Authors are also invited to submit papers on non-agricultural aspects of grassland management such as recreational and amenity use and the environmental implications of all grassland systems. The Journal considers papers from all climatic zones.