Embrapa Pecuária Sudeste (CPPSE) https://www.alice.cnptia.embrapa.br/alice/handle/item/28 2026-04-23T00:05:49Z 2026-04-23T00:05:49Z SILVA, R. T. da GENUÍNO, M. V. H. BESSA, A. F. O. CÂMARA, G. M. S. OLIVEIRA, A. C. J. SILVA, J. A. II V. MOTA, L. F. M. REY, F. S. B. REGITANO, L. C. de A. MARCONDES, C. R. BERNARDES, P. A. BERRY, D. P. MUNARI, D. P. BUZANSKAS, M. E. https://www.alice.cnptia.embrapa.br/alice/handle/doc/1186337 2026-04-22T20:48:39Z 2026-01-01T00:00:00Z

Título: Effect of founder breeds on genotype imputation accuracy in Canchim cattle. Autoria: SILVA, R. T. da; GENUÍNO, M. V. H.; BESSA, A. F. O.; CÂMARA, G. M. S.; OLIVEIRA, A. C. J.; SILVA, J. A. II V.; MOTA, L. F. M.; REY, F. S. B.; REGITANO, L. C. de A.; MARCONDES, C. R.; BERNARDES, P. A.; BERRY, D. P.; MUNARI, D. P.; BUZANSKAS, M. E. Conteúdo: Genotype imputation is a technique used to infer unobserved genotypes based on reference panels, allowing increased marker density and cost-effective optimization for genomic selection. This study aimed to evaluate whether the inclusion of genotypes from the founder breeds Nelore (NE) and Charolais (CH) improves the imputation accuracy in the composite beef cattle breed Canchim (CA). The populations studied consisted of 804 NE, 897 CH, and 392 CA animals, all genotyped using high-density panels (777,962 SNP - single nucleotide polymorphisms). CA animals had their genotypes masked to simulate a medium-density panel (54,609 SNP). Fourteen imputation scenarios were evaluated, varying according to breed, sex, year of birth, and lineage. Imputation accuracy was determined based on the percentage of correctly imputed genotypes (PERC) and the squared Pearson's correlation between observed and imputed genotypes (R2). PERC values ranged from 66.52% to 97.39% and R² from 0.6352 to 0.9780. The scenarios that included NE, CH, and CA (males or animals born before 2004) as the reference population for imputing CA females or CA animals born after 2004 showed the highest imputation accuracies. Therefore, the use of founder breeds in the reference population improves the accuracy of genotype imputation in CA cattle. The results indicate that a multibreed reference population, incorporating founder breeds, could provide a more robust and informative genetic basis for imputing composite cattle.

2026-01-01T00:00:00Z FURTADO, A. J. ABDALLA FILHO, A. L. PERNA JUNIOR, F. PASQUINI NETO, R. SILVA, G. V. da LOBO, A. A. G. COELHO, L. de M. BRUNO, J. F. BERNDT, A. PEDROSO, A. de F. MEDEIROS, S. R. de OLIVEIRA, P. P. A. RODRIGUES, P. H. M. https://www.alice.cnptia.embrapa.br/alice/handle/doc/1186170 2026-04-12T01:35:31Z 2026-01-01T00:00:00Z

Título: Intake, digestibility and rumen fermentation in Nellore bulls grazing degraded or recovered pastures of Urochloa ssp. or the grass intercropped with pigeon pea. Autoria: FURTADO, A. J.; ABDALLA FILHO, A. L.; PERNA JUNIOR, F.; PASQUINI NETO, R.; SILVA, G. V. da; LOBO, A. A. G.; COELHO, L. de M.; BRUNO, J. F.; BERNDT, A.; PEDROSO, A. de F.; MEDEIROS, S. R. de; OLIVEIRA, P. P. A.; RODRIGUES, P. H. M. Conteúdo: With global population growth, livestock production must be intensified with reduced environmental impact. The benefits of legume-grass intercropping are well-documented; however, no studies have evaluated ruminal fermentation and digestive kinetics. Pigeon pea, a legume intercropped with tropical grasses, can improve the nutritional value of forage, increasing digestive efficiency and mitigating methane emissions, while also reducing the need for nitrogen fertilization. Over two years, nine rumen-cannulated Nellore bulls were allocated to nine experimental paddocks (1.25 ha each; total area of 11.25 ha) in a randomized complete block design, with year as the blocking factor. Treatments followed a 3 × 2 factorial arrangement, consisting of three forage systems and two seasons (dry and rainy), with three paddock replicates per treatment: DEG, a degraded pasture; REC, recovered pasture fertilized with 200 kg of N; and MIX, mixture of legume-grass pasture. External and internal markers were used to determine dry matter intake (DMI). Grass and legume intake proportions were estimated using C3 and C4 carbon isotopes. The concentration and production of short-chain fatty acids, methane, and ammonia compounds were calculated using the ex-situ fermentation technique. Animals in DEG pasture presented a higher DMI of the supplement and higher relative energy loss as methane production, while a higher level of DM digestibility was observed in the MIX pasture. Higher ruminal concentrations of NH3-N were obtained for animals in the REC pasture. The lowest ruminal DM and NDF degradation rates were observed in the MIX pasture.

2026-01-01T00:00:00Z BENTO, L. R. MARTIN NETO, L. SANTOS, J. V. dos FREITAS, V. da S. PEZZOPANE, J. R. M. BERNARDI, A. C. de C. OLIVEIRA, P. P. A. SCHWEIZER, S. A. https://www.alice.cnptia.embrapa.br/alice/handle/doc/1186180 2026-04-12T01:35:49Z 2026-01-01T00:00:00Z

Título: Pasture management in Ferralsols drives mineral-associated organic matter storage, exceeding native soil carbon stocks and enhancing cation exchange capacity. Autoria: BENTO, L. R.; MARTIN NETO, L.; SANTOS, J. V. dos; FREITAS, V. da S.; PEZZOPANE, J. R. M.; BERNARDI, A. C. de C.; OLIVEIRA, P. P. A.; SCHWEIZER, S. A. Conteúdo: Pasture management is pivotal for enhancing soil organic carbon (SOC) storage in tropical grasslands, yet SOC recovery is often considered merely as the replenishment of historical losses following land-use change. It remains unclear whether managed Ferralsols can surpass the SOC stocks of native vegetation (NV) and which mechanisms drive such gains. We evaluated SOC pools, chemical composition, and nutrient-holding capacity after 24 years under unmanaged degraded pasture (DP) and fertilized managed pasture (MP), relative to NV. SOC storage in these systems was primarily mediated by the mineral-associated organic matter (MAOM) pool. Compared to NV, DP soils exhibited reduced MAOM stocks (119 vs. 92 Mg C ha−1), whereas MP soils stored 148 Mg C ha−1. In DP, soil acidity, low nutrient availability, and poor forage inputs induced microbial stress (as revealed by phospholipid fatty acid profiles), likely constraining MAOM formation and yielding MAOM enriched in carbohydrates with fewer carbonyl groups. In contrast, liming and fertilization in MP alleviated the Ferralsol’s low pH and nutrient deficiencies, enhancing forage yields and reducing microbial stress, likely promoting MAOM with more microbially processed signatures. NanoSIMS analyses revealed microscale organic matter patches sparsely covering clay-sized particles, indicating that SOC storage is decoupled from mineral surface area and highlighting the role of organic inputs and microbial activity in MAOM formation. Higher MAOM under MP not only increased SOC stocks but also enhanced cation exchange capacity, demonstrating that targeted pasture management can exceed native SOC stocks while improving nutrient retention.

2026-01-01T00:00:00Z SILVA, G. V. da PASQUINI NETO, R. MELO, M. N. V. de ANDRADE, L. B. de FURTADO, A. J. FABRICIO, E. C. BERTOLONI, A. V. LOBO, A. A. G. PERNA JUNIOR, F. MEDEIROS, S. R. de BERNDT, A. NASSU, R. T. PEDROSO, A. de F. OLIVEIRA, P. P. A. PEREIRA, A. S. C. RODRIGUES, P. H. M. https://www.alice.cnptia.embrapa.br/alice/handle/doc/1186091 2026-04-12T01:35:11Z 2026-01-01T00:00:00Z

Título: Intensified tropical pasture-based beef cattle production systems and their effects on carcass traits, meat quality and methane emissions from Nellore steers. Autoria: SILVA, G. V. da; PASQUINI NETO, R.; MELO, M. N. V. de; ANDRADE, L. B. de; FURTADO, A. J.; FABRICIO, E. C.; BERTOLONI, A. V.; LOBO, A. A. G.; PERNA JUNIOR, F.; MEDEIROS, S. R. de; BERNDT, A.; NASSU, R. T.; PEDROSO, A. de F.; OLIVEIRA, P. P. A.; PEREIRA, A. S. C.; RODRIGUES, P. H. M. Conteúdo: This study evaluated the effects of five pasture-based production systems on the carcass and meat quality traits, as well as the methane (CH4) emissions intensity of male Nellore steers per kg of carcass under tropical conditions. Over two years (2019–2021), uncastrated male steers (three/year/experimental spatial unit) were randomly assigned to five treatments (with two replicates): 1) degraded pasture without nitrogen (N) fertilization (DP0); 2) silvopastoral with 200 kg N ha-1 (SP200); 3) rainfed pasture with 200 kg N ha-1 (RP200); 4) rainfed pasture with 400 kg N ha-1 (RP400); and 5) irrigated pasture with 600 kg N ha-1 (IP600). Animals grazed exclusively, receiving water and mineral-protein supplement ad libitum until being stunned by the Brazilian-approved method cranial concussion, followed by exsanguination, without electrical stimulation. The carcass and meat quality traits observed are positively influenced by intensification. Specifically, IP600, RP400 and RP200 demonstrate a clear benefit in improving RA, BFT, LCCW, CEP and FT (including HEP, FEP and spareribs), and Bones (expressed as kg carcass-1 and %); while SP200 and DP0 restricted the growth rates and muscle development of the animals due to the competition between the trees and the pasture and lack of fertilization, respectively. For CH4 emission intensities (per kg of carcass), SP200 and DP0 exhibited the highest emissions without proportional production gains, while IP600, RP400, and RP200 showed the lowest values. Well-managed intensified pasture-based systems consistently achieved lower CH4 emission per unit of product than those observed in DP0, confirming their potential as a viable sustainability system.

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