Oak woodlands (OW) have historically been important in the Mediterranean region since they provide an important amount of goods and services, such as fodder and shelter for extensive livestock production systems. However, OW lost relevance as a fodder supplier due to the specialization and intensification of livestock production. Nowadays, with the challenges emerging from climate change and other environmental concerns, OW are regaining interest as silvopastoral systems. The aim of this study was to evaluate the seasonal variation of the chemical composition and the in vitro organic matter digestibility (IVOMD) of key browse species in grazed OW in the north of Portugal. Additionally, the feeding value was compared with the requirements of goats’ maintenance and late pregnancy. The browse species evaluated were Quercus suber, Q. rotundifolia, Q. faginea, Juniperus oxycedrus, Cytisus scoparius, C. multiflorus, Genista falcata, Cistus ladanifer, and Lavandula stoechas. The data were analysed by a two way analysis of variance focusing on species and season and their interaction. The results obtained varied significantly among the species studied regarding the crude protein content (CP) (41.6–195.9 g kg⁻¹ dry matter (DM)), fibres (neutral detergent fibre (NDF): 316.7–632.5 g kg⁻¹ DM; acid detergent fibre (ADF): 246.0–468.0 g kg⁻¹DM; acid detergent lignin (ADL): 90–210.5 g kg⁻¹ DM), IVOMD (33.02–71.34%), and metabolizable energy (ME) (5.78–11.42 MJ kg⁻¹ DM). Both C. ladanifer and Q. rotundifolia have inadequate ME and CP levels to meet the nutritional needs of goats with 45 kg of live weight. Only leguminous shrubs cover CP needs in late pregnancy.

橡树林地（OW）在地中海地区历来很重要，因为它们提供了大量的商品和服务，例如用于广泛的牲畜生产系统的饲料和庇护所。但是，由于牲畜生产的专业化和集约化，OW作为饲料供应商失去了相关性。如今，随着气候变化和其他环境问题所带来的挑战，OW正逐渐成为银牧系统的关注点。这项研究的目的是评估葡萄牙北部放牧OW中主要浏览物种的化学成分和体外有机物消化率（IVOMD）的季节性变化。此外，将饲喂值与山羊维持和怀孕后期的需求进行了比较。被评估的浏览物种是栓皮栎，Q.圆叶，Q. faginea，刺柏oxycedrus，金雀儿，C. multiflorus，染料木楹，胶蔷树，和薰衣草头状。通过对物种和季节及其相互作用的方差的双向分析来分析数据。在所研究的物种中，关于粗蛋白含量（CP）（41.6–195.9 g kg ^-1干物质（DM）），纤维（中性洗涤剂纤维（NDF）：316.7–632.5 g kg ^-1 DM；酸性洗涤剂纤维（ADF）：246.0–468.0 g千克^-1DM; 酸性洗涤剂木质素（ADL）：90–210.5 g kg ^-1 DM，IVOMD（33.02–71.34％）和代谢能（ME）（5.78-11.42 MJ kg ^-1 DM）。无论C. ladanifer和Q.圆叶有ME和CP水平不足以满足山羊的营养需要用45公斤活重。只有豆科灌木才能满足妊娠后期的CP需求。