多年生黑麦草、多年生黑麦草和白三叶草与多品种农田系统营养价值的比较

Grassland Research Pub Date : 2023-06-24 DOI:10.1002/glr2.12052

Shona Baker, Mary B. Lynch, Fionnuala Godwin, Tommy M. Boland, Alexander C. O. Evans, Paul N. C. Murphy, Alan K. Kelly, Helen Sheridan

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摘要

背景可获得的关于多物种草地在轮作放牧时的营养价值和结构特征的信息有限。方法对三种农家乐的营养价值进行调查：多年生黑麦草（LP）；L.perenne+Trifolium repens（LP+TR）；以及含有草、豆类和草本植物的多品种草地（MSS）。农场饲养了肉牛（2.5头单位ha−1），在1 公顷至6 cm（MSS）和4 cm（LP和LP+TR）残差。结果MSS中的灰分浓度高于LP（84 vs.75 g kg−1 DM）。LP+TR和MSS均具有比LP更高的粗蛋白和更低的中性洗涤纤维浓度。水溶性碳水化合物和干物质（DM）浓度的相对排名为LP >； LP+TR >； MSS。尽管LP农场的叶片成分对牧草DM的贡献更大，但草地的有机物消化能力相似。结论MSS和LP+TR小农场在集约放牧条件下获得了与LP相似的饲料质量。然而，值得注意的是，MSS具有较高浓度的酸性洗涤剂木质素，这会对消化率产生负面影响。需要进一步的研究来确定最佳的放牧管理实践，以最大限度地减少木质素浓度对多品种草地消化率的影响。

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A comparison of the nutritive value of perennial ryegrass, perennial ryegrass and white clover and multispecies-based farmlet systems

Background

Limited information is available regarding the nutritive value and structural characteristics of multispecies swards when rotationally grazed.

Methods

Three farmlet types were investigated in terms of their nutritive value: Lolium perenne (LP); L. perenne+Trifolium repens (LP+TR); and a multispecies sward containing grasses, legumes and herbs (MSS). Farmlets were stocked with beef steers (2.5 livestock units ha⁻¹), grazed on a 1 ha scale to 6 cm (MSS) and 4 cm (LP and LP+TR) residuals.

Results

A greater ash concentration was found in MSS than LP (84 vs. 75 g kg⁻¹ DM). Both LP+TR and MSS had higher crude protein and lower neutral detergent fibre concentrations than LP. The relative ranking of water soluble carbohydrate and dry matter (DM) concentration was LP > LP+TR > MSS. Despite the leaf component of the LP farmlet contributing more to herbage DM, the organic matter digestibilities of the swards were similar.

Conclusions

The MSS and LP+TR farmlets achieved similar forage quality under intensive grazing to LP. However, it is worth noting that MSS had a higher concentration of acid detergent lignin, which can negatively impact digestibility. Further investigation is needed to determine optimal grazing management practices that can minimise the effects of higher lignin concentration on digestibility in multispecies swards.

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