Integrated systems improve the nutritive value of pastures, contribute to the storage of carbon (C) in the soil, and consequently, to the reduction of greenhouse gases (GHG), especially enteric methane (CH4). The objective of this study was to evaluate the intensity of enteric CH4 emission in cattle, stock C in soil, yield and nutritional value of forage in different pasture production systems. The study was conducted at Embrapa Cerrados, Planaltina-DF, Brazil, with a completely randomized design: 6 Nellore animals (324±37 kg of live weight) per treatment and 3 production systems: continuous pasture of BRS Piatã (S1), pasture of BRS Piatã intercropped with the legume pigeon pea (S2) and pasture of BRS Zuri rotated every 3 years with crop (S3). The sampling to evaluate C stocks in soil was performed on December 06, 2023, considering the layers 0-10, 10-20, 20-30 and 30-40, LSD test at 5% applied. The CH4 evaluations took place in May, August and December 2024. The trace gas technique, sulfur hexafluoride (SF6) was used. The bromatological analyses performed in the transition between wet-dry and dry season. Tukey's test at 5% was applied. The C stock was higher in S2 compared to S1 (p< 0.05), was 76.99, 93.18 and 80.43 Mg ha-1 for land use systems S1, S2, and S3, respectively The CH4 emission intensity was lower in S2 and S3 compared to S1, with averages of 269, 224 and 450 g CH4 kg GPV-1 ha-1, respectively. The S2 showed higher crude protein content and lower neutral detergent fiber content in the wet-dry transition. S3 has the highest dry matter (DM) yield. Therefore, the intercropping of grasses and grasses with legumes increase soil C stocks, showed better nutritional value while rotational pasture has higher DM production and both lower CH4 emission intensities.
