River transport of cattle in northern Brazil - a systematic review Welligton Conceição da Silva, Éder Bruno Rebelo da Silva, Italo Messias Ferreira de Souza, Vanessa Sousa Pinto, Luís Gustavo Paixão Vilela, et al. Tropical Animal Health and Production, 2026 The river transport of cattle by barges is a common practice in western Pará, where rivers are the main access routes to livestock production, slaughter, and marketing areas. In this context, the long journeys made by boats or ferries adapted for cattle transport can expose animals to conditions of thermal stress, due to the high relative humidity of the region, temperature and humidity fluctuations, and wind speed. This review was conducted through a literature search in the ScienceDirect and PubMed databases. Inclusion criteria were full-text articles written in English and Portuguese that discussed the legal aspects, stress, management, challenges, and prospects of river transport of cattle in northern Brazil. As exclusion criteria, studies that did not align with the study’s objective were disregarded. The PRISMA checklist was used for conducting this review. The region relies on river transport due to road limitations, using rivers as the main logistical routes for moving products. The poor infrastructure of ports and vessels compromises animal welfare and highlights the need for investments to ensure efficiency and competitiveness in the production chain. River transport of cattle in western Para is an important component of Amazon livestock farming, being essential for product distribution and the integrity of the production chain. This activity involves challenges related to animal welfare, associated with adverse environmental factors, stocking density, long travel periods, and the constant movement of vessels. The implementation of good management practices, adequate infrastructure, and continuous monitoring strategies emerges as an effective way to reduce stress and prevent injuries during transport, along with technologies for monitoring and evaluating composite indices.
Genetic Parameters of Age at Conception in Nellore Females Using Threshold Models Raimundo Nonato Colares Camargo Júnior, Cláudio Vieira de Araújo, Marina de Nadai Bonin Gomes, Feliciano Benedetti de Freitas, Welligton Conceição da Silva, et al. Journal of Animal Breeding and Genetics, 2026 Age at conception is a critical factor in the intensification of production systems. It is crucial for intensifying production, optimising reproductive efficiency and boosting Nellore female productivity for genetic progress. However, the low heritability estimates currently limit the effectiveness of selection responses, thereby underscoring the necessity for more precise genetic parameter estimation methods. The aim of this study was to evaluate the genetic associations between body weights at weaning and yearling, and age at conception, in Nellore females. The methodology employed in this study involved the utilisation of a mixed polychotomous threshold model, a methodological framework that has been deemed appropriate for the analysis of categorical variables characterised by an underlying continuous distribution. The records of body weights at weaning and yearling, in conjunction with female age at conception, from 796 animals, were treated as a categorical variable associated with conception success. The (co)variance components were estimated via Bayesian inference using a Gibbs sampler. The mean heritability values were 0.43 (0.27; 0.60) for weaning weight, 0.63 (0.46; 0.81) for yearling weight, and 0.19 (0.06; 0.40) for the categorical variable of age at conception. While body weights exhibited a high additive genetic correlation were (0.79; 95% CI: 0.57; 0.96), correlations were lower between the categorical variable and weaning (−0.21; 95% CI: −0.75; 0.28) and yearling (0.34; 95% CI: −0.14; 0.71) weights. The study concluded that indicators of age at conception should incorporate additional selective criteria beyond body weight in order to improve the probability of conception.
A Supervised Deep Learning Model Was Developed to Classify Nelore Cattle (Bos indicus) with Heat Stress in the Brazilian Amazon Welligton Conceição da Silva, Jamile Andréa Rodrigues da Silva, Lucietta Guerreiro Martorano, Éder Bruno Rebelo da Silva, Cláudio Vieira de Araújo, et al. Animals, 2026 Non-invasive and intelligent technologies have been utilized to monitor agricultural systems in real time, facilitating expedient decision-making and the reduction in animal stress in diverse climatic conditions. The objective of this study was to develop a deep learning supervised model to classify Nelore cattle (Bos indicus) into two groups: those in comfort and those under thermal stress. Thirty cattle, aged between 18 and 20 months, were evaluated between June and December 2023, resulting in 676 samples collected across four daily periods (6:00, 12:00, 18:00, and 24:00). Biotic variables included rectal temperature (RT) and respiratory rate (RR), while abiotic variables included air temperature (AT) and relative humidity (RH). The neural network model exhibited an accuracy and recall of 72% but a low specificity of 42%. These metrics indicate that while the model is effective in detecting stress situations, it faces challenges in correctly identifying animals in thermal comfort, likely due to class imbalance and the need for additional input features to capture environmental adaptability. Consequently, it can be posited that supervised learning models are valuable tools for precision livestock farming, provided that discriminatory limitations are mitigated by refining input characteristics and data balancing.
Logistics and CO2e emissions from beef cattle transportation in Brazil between 2018 and 2020 Fabio Martins Guerra Nunes Dias, Fredson Vieira e Silva, André Guimarães Maciel e Silva, Guilherme Jordão de Magalhães Rosa, José Bento Sterman Ferraz Scientific Reports, 2025 This study analysed the logistics of beef cattle transportation in Brazil from 2018 to 2020, based on 288,267 freight orders involving over 19 million animals from 42,805 farms and 38 slaughterhouses in ten states. The analysis included vehicle categorization, travel distances, carcass weights, available space per animal, and CO 2 equivalent (CO2e) emissions, which amounted to approximately 87,000 tonnes across 244,394 valid records. We hypothesized that emissions would vary substantially by truck class and transport conditions. Given that the median one-way transport distance was 160 km, all emission estimates were calculated for a 320 km round trip to reflect the full journey. Small trucks (up to 18 animals) were the most frequently used but also the least efficient; emissions for this class reached a median of 56.89 kg per ton of carcass and 13.99 kg per animal, with 75th percentiles as high as 98 kg/ton. In contrast, the Trailer54 class showed the highest efficiency, with a median of 37.77 kg/ton of carcass (IQR: 20.5–62.5). Across all classes, the wide gaps between the 25th and 75th percentiles point to substantial room for optimization. Emission intensity also varied between and within states, with median values per animal ranging from 8.74 kg in Minas Gerais to 17.31 kg in Rondônia. Intra-state variability was also considerable, as indicated by the wide interquartile ranges. Although emissions from livestock transport represent a small fraction of Brazil’s total GHG inventory, their spatial variability and operational inefficiencies make them strategically relevant for climate and logistics policy. These findings underscore the importance of region-specific strategies, fleet modernization, and improved logistical planning to support low-carbon beef supply chains.
Risk Factors Associated with Bruises in Beef Cattle Carcasses Fabio Dias, Fredson Silva, André Silva, Jonas Araújo, Guilherme Rosa, et al. Animals, 2025 Bruises in beef cattle carcasses are important indicators related to pre-slaughter handling and transport conditions, with implications for animal welfare and meat quality. This study analysed 19.4 million cattle carcasses transported from 42,805 farms to 38 slaughterhouses in Brazil to identify factors associated with bruising. Logistic regression models were used to assess the effects of sex, age, transport distance from farm to industry, and truck class. At least one bruise was found in 33.8% of the analysed carcasses. Older animals had a greater prevalence of bruising, and females were the most affected. The relationship between transport distance and bruising varied across carcass regions, showing distinct patterns rather than a uniform trend. Compared with larger-capacity vehicles, smaller trucks increased the risk of bruising. The round, rump, and flank regions presented the greatest number of bruises. The models assessing individual effects demonstrated good overall performance, with accuracy ranging from 75% to 82% in identifying bruises. The best performance was observed for round-rump, likely due to the higher frequency of bruises in these cuts. These findings highlight the need to improve transport logistics, adopt better handling practices, and implement specific interventions to reduce bruising.
Heterogeneity of Variances in Milk Yield in Murrah Buffaloes Raimundo Nonato Colares Camargo Júnior, Cláudio Vieira de Araújo, José Ribamar Felipe Marques, Marina de Nadai Bonin Gomes, Welligton Conceição da Silva, et al. Animals, 2025 The aim of this study was to assess the presence of heterogeneity of variance in milk yield in the first lactation of buffaloes and its subsequent influence on the genetic evaluation of Murrah breed sires. The analysis utilized a dataset comprising 2392 milk yield records of buffaloes involved in the Programa de Melhoramento de Búfalos do Brasil. The standard deviation classes were established by standardizing the averages of contemporary group levels, with positive values constituting the high standard deviation class and values equaling or less than zero comprising the low standard deviation class. The linear mixed model incorporated fixed effects of sire group, buffalo age at calving, and heterozygosity as covariates, along with additive genetic random effects. Variance components were estimated via Bayesian inference employing the Gibbs sampler to derive posterior means. The average posterior heritability obtained in analyses without considering heterogeneity of variances (i.e., the “general analysis”) was 0.21, while the averages 0.19 and 0.34 were obtained for the low and high standard deviation classes, respectively. The genetic correlation between standard deviation classes was 0.61. The genetic correlation estimates between the predictions of breeding values for milk yield were more closely aligned between the predictions obtained in the general analysis with the low standard deviation class, and more discrepant between the two standard deviation classes. In the animal genetic evaluation model, when heterogeneity of variance is disregarded, the variance components are substantially weighted towards the performance of individuals in the low phenotypic variability class. By disregarding the presence and heterogeneity of variance, the breeding values of the best sires were underestimated.
Is the Mineral Content of Muscle Tissue (Longissimus Lumborum) in Cattle Finished During the Rainy Season in the Eastern Amazon Influenced by Different Farming Systems? Ana Paula Damasceno Ferreira, Jamile Andréa Rodrigues da Silva, Miguel Pedro Mourato, José António Mestre Prates, Thomaz Cyro Guimarães de Carvalho Rodrigues, et al. Animals, 2025 The scientific literature currently lacks studies that evaluate the nutritional composition of the tissues of cattle raised in different systems, so that the nutritional effects can be known and used to enhance consumption and use in the diet. The aim was therefore to assess whether the mineral content of muscle tissue (longissimus lumborum) in cattle finished during the rainy season in the Eastern Amazon is influenced by different farming systems. The treatments consisted of four systems (three pasture production systems and one feedlot system). 1. native wetland pasture in Santa Cruz do Arari (Mesoregion of Marajó); 2. native wetland pasture in Monte Alegre (Mesoregion of Baixo Amazonas); 3. cultivated dryland pasture in São Miguel do Guamá (Mesoregion of Nordeste Paraense); and 4. Confinement in Santa Izabel do Pará (Metropolitan Region of Belém). The analyses were carried out on samples of the longissimus lumborum muscle tissue of 48 male, castrated, crossbred Nelore cattle, twelve per breeding system, from commercial farms, destined for meat production, finished during the rainiest period of the year (between January and June). In systems 1 and 2, the animals were slaughtered in licensed slaughterhouses; the animals in systems 3 and 4 were slaughtered in commercial slaughterhouses. Food sampling and chemical analysis, soil sample collection and analysis, longissimus lumborum muscle tissue collection, sample preparation and digestion, and inductively coupled plasma optical emission spectrometry were evaluated. The experimental design was completely randomized in a linear model with four rearing systems and one period (rainy). The data was compared using the Statistical Analysis Systems (SAS) program. All analyses were carried out considering a significance level of 0.05. Samples of the diets offered (pasture and concentrate) were also collected. The Amazon systems influenced the macro- and micromineral content in the muscles of cattle (p < 0.05). The interaction between pasture systems vs. confinement showed differences in the minerals calcium (Ca), magnesium (Mg), phosphorus (P), copper (Cu), zinc (Zn), iron (Fe), and manganese (Mn) (p < 0.05). However, there was no difference in the values of sodium (Na), potassium (K), and sulfur (S) between the rearing systems (p > 0.05). By contrast, the cultivated pasture system vs. extensive pasture showed differences in all the elements evaluated (p < 0.05). The rearing systems of the Eastern Amazon influenced the mineral content of beef, which continues to be an excellent source of macro- and microminerals and can compose the human diet.
Rib fracture in buffalo with ruminal cannula Francisco Décio De Oliveira Monteiro, Gabriela Melo Alves dos Santos, Hugo Haick Perdigão, Luiz Henrique Vilela Araújo, André Guimaraes Maciel e Silva, et al. Acta Scientiae Veterinariae, 2020
Genetic Parameters of Age at Conception in Nellore Females Using Threshold Models RNC Camargo Junior, CV de Araújo, MNB Gomes, FB de Freitas, ... Journal of Animal Breeding and Genetics 143 (3), 403-410 , 2026 2026
A Supervised Deep Learning Model Was Developed to Classify Nelore Cattle ( Bos indicus ) with Heat Stress in the Brazilian Amazon WC Silva, JAR Silva, LG Martorano, ÉBR Silva, CV Araújo, ... Animals 16 (2), 161 , 2026 2026
Predictors of conversion from cannabis-induced psychosis to schizophrenia: a three-year follow-up study AS Machado, JT Coelho, AE de Sousa, C Carvalho, A Silva, ... Neuroscience Applied 5, 105830 , 2026 2026
Produção de gases in vitro de dietas contendo diferentes níveis de farelo de dendê, em substituição a silagem de milho GS Araújo, JC de Castro Budel, BD Pinho, LG Martorano, ... Observatorio de la Economía Latinoamericana 24 (3), 27 , 2026 2026
The Role of Biopsy in GIST: Assessing Its Utility D Lira, AM Silva, D Paula, P Martins, A Moreira, JA de Sousa European Journal of Surgical Oncology 51 , 2025 2025
Genetic Parameters of Age at Conception in Nellore Females Using Threshold Models RNCC Júnior, CV de Araújo, MNB Gomes, FB de Freitas, WC da Silva, ... Journal of Animal Breeding and Genetics 143 (3), 403 , 2025 2025
Logistics and CO 2 e emissions from beef cattle transportation in Brazil between 2018 and 2020 FMGN Dias, F Vieira e Silva, AG Maciel e Silva, GJ de Magalhães Rosa, ... Scientific Reports 15 (1), 38063 , 2025 2025
A 12-week meddiet+ intervention improves rheumatoid arthritis outcomes: Preliminary findings from the tasty trial A Hernando, S Charneca, I Almada-Correia, J Polido-Pereira, ... Clinical Nutrition ESPEN 69, 1113-1114 , 2025 2025
EARLY-LIFE HIGH-CALORIC DIETS IMPAIR HIPPOCAMPAL NEUROGENESIS AND GABAERGIC INTERNEURONS: IMPLICATIONS FOR BRAIN DEVELOPMENT AND VULNERABILITY B Caetano-Mota, M Correia, S Sousa, A Rogeiro, A Silva, PA Pereira, ... ANATOMICAL RECORD-ADVANCES IN INTEGRATIVE ANATOMY AND EVOLUTIONARY BIOLOGY … , 2025 2025
Heterogeneity of Variances in Milk Yield in Murrah Buffaloes RNC Camargo Jr, CV de Araujo, JRF Marques, MN Bonin Gomes, ... ANIMALS 15 (18) , 2025 2025
Heterogeneity of Variances in Milk Yield in Murrah Buffaloes RNC Camargo Júnior, CV de Araújo, JRF Marques, MN Bonin Gomes, ... Animals 15 (18), 2686 , 2025 2025
Comparison between linear mixed model and threshold model in the estimation of variance components in age at first calving and milk production in buffaloes RNC Camargo-Júnior, CV de Araújo, MNB Gomes, JRF Marques, ... Frontiers in Veterinary Science 12, 1649690 , 2025 2025 Citations: 2
EVALUATION OF A PROGRAM TO PROMOTE HEALTHY INTIMATE RELATIONSHIPS IN ADOLESCENTS C Verissimo, A Silva, I Moreira, M Neto, C Alegre, I Fernandes GACETA SANITARIA 39 , 2025 2025
179-ESTILOS DE VIDA E BEM-ESTAR PSICOLÓGICO EM ESTUDANTES DO ENSINO SUPERIOR AM Silva, NA Olanrewaju, IS Brito Gac Sanit 39 (S2), 613 , 2025 2025
515-AVALIA 敲 O DE UM PROGRAMA DE PROMO 敲 O DE RELA 钦 ES DE INTIMIDADE SAUD 罺 EIS EM ADOLESCENTES A Silva, I Moreira, M Neto, C Alegre, I Fernandes Gaceta Sanitaria 39, 107060 , 2025 2025
Prevalence, geospatial distribution, and risk factors for bovine cysticercosis across diverse states of Brazil FMGN Dias, LL dos Santos Oliveira, FV e Silva, AGM e Silva, JBS Ferraz, ... Veterinary Parasitology: Regional Studies and Reports 63, 101305 , 2025 2025
Is the Mineral Content of Muscle Tissue ( Longissimus Lumborum ) in Cattle Finished During the Rainy Season in the Eastern Amazon Influenced by Different … APD Ferreira, JAR Silva, MP Mourato, JAM Prates, TCGC Rodrigues, ... Animals 15 (15), 2186 , 2025 2025 Citations: 1
Development of curcumin-based nanoparticles as an antioxidant and anti-inflammatory formulation for topical application T Coutinho, C Martins-Gomes, E Souto, A Silva FEBS OPEN BIO 15, 493-494 , 2025 2025
Molecular structure influences the reduction in the production of inflammatory markers in macrophages exposed to different flavonoids AM Silva, C Martins-Gomes FEBS OPEN BIO 15, 384-385 , 2025 2025
MOST CITED SCHOLAR PUBLICATIONS
Assessment of surface temperatures of buffalo bulls (Bubalus bubalis) raised under tropical conditions using infrared thermography DV Barros, LKX Silva, PR Kahwage, JB Lourenço Júnior, JS Sousa, ... Arquivo Brasileiro de Medicina Veterinária e Zootecnia 68, 422-430 , 2016 2016.0 Citations: 70
Tucumã oil shifted ruminal fermentation, reducing methane production and altering the microbiome but decreased substrate digestibility within a RUSITEC fed a mixed hay … AFO Ramos, SA Terry, DB Holman, G Breves, LGR Pereira, AGM Silva, ... Frontiers in microbiology 9, 1647 , 2018 2018.0 Citations: 46
Multifocal cutaneous ORF virus infection in goats in the Amazon region, Brazil CHS de Oliveira, FL Assis, JDB Neto, CMC Oliveira, CTA Lopes, ... Vector-borne and zoonotic diseases 12 (4), 336-340 , 2012 2012.0 Citations: 37
Infrared thermography to assess thermoregulatory reactions of female buffaloes in a humid tropical environment CC Brcko, JAR Silva, LG Martorano, RA Vilela, BS Nahúm, AGM Silva, ... Frontiers in veterinary science 7, 180 , 2020 2020.0 Citations: 35
ABCD-ARQ BRAS CIR DI M Ramos, A Silva, M Ramos, E Canseco, M Galvao-Neto V32, DOI 10 , 2019 2019.0 Citations: 35
Metal-based nanoparticles as antimicrobial agents: an overview. Nanomaterials. 2020; 10 (2): 292 E Sánchez-López, D Gomes, G Esteruelas, L Bonilla, AL Lopez-Machado, ... Citations: 35
Animal welfare and effects of per-female stress on male and cattle reproduction—A review WC Silva, JAR Silva, RNC Camargo-Júnior, ÉBR Silva, MRP Santos, ... Frontiers in Veterinary Science 10, 1083469 , 2023 2023.0 Citations: 33
G3BP1 knockdown sensitizes U87 glioblastoma cell line to Bortezomib by inhibiting stress granules assembly and potentializing apoptosis LFF Bittencourt, GL Negreiros-Lima, LP Sousa, AG Silva, IBS Souza, ... Journal of neuro-oncology 144 (3), 463-473 , 2019 2019.0 Citations: 30
Efeito do tamanho de partícula do volumoso e da freqüência de alimentação sobre o consumo ea digestibilidade em ovinos SP Gomes, ALCC Borges, I Borges, GLM Júnior, AGM Silva, CG Pancoti Revista Brasileira de Saúde e Produção Animal 13 (1), 137-149 , 2012 2012.0 Citations: 30
Tissue composition and allometric growth of carcass of lambs Santa Inês and crossbreed with breed Dorper MAP de Sousa, ACS Lima, JC Araújo, CMC Guimarães, MRSP Joele, ... Tropical animal health and production 51 (7), 1903-1908 , 2019 2019.0 Citations: 27
Caracterização do nível tecnológico da pecuária bovina na Amazônia Brasileira. MAS dos SANTOS, JB LOURENÇO JUNIOR, AC de SANTANA, ... 2017.0 Citations: 26
Evaluation of thermal comfort, physiological, hematological, and seminal features of buffalo bulls in an artificial insemination station in a tropical environment DV Barros, LKX Silva, J de Brito Lourenço Jr, AOA da Silva, AGM e Silva, ... Tropical animal health and production 47 (5), 805-813 , 2015 2015.0 Citations: 26
Effect of electrolytic lesion of the median raphe nucleus on behavioral and physiological measures of stress. TG Andrade, AM Silva, CL Silva, FG Graeff Acta Physiologica, Pharmacologica et Therapeutica Latinoamericana: Organo de … , 1999 1999.0 Citations: 24
Use of near infrared spectroscopy for the evaluation of forage for ruminants CC da Paz, AGM e Silva, AC do Rego Revista de Ciências Agrárias 62 , 2019 2019.0 Citations: 20
Evaluation of the temperature and humidity index to support the implementation of a rearing system for ruminants in the Western Amazon WC Silva, OVN Printes, DO Lima, ÉBR Silva, MRP Dos Santos, ... Frontiers in Veterinary Science 10, 1198678 , 2023 2023.0 Citations: 19
Prevalência de anticorpos anti-Toxoplasma gondii em búfalos (Bubalus bubalis) no Estado do Pará JB Silva, AH Fonseca, SJT Andrade, AGM Silva, CMC Oliveira, ... Pesquisa Veterinária Brasileira 33 (5), 581-585 , 2013 2013.0 Citations: 18
Low transmission rates of Equine infectious anemia virus (EIAV) in foals born to seropositive feral mares inhabiting the Amazon delta region despite climatic conditions … CF Resende, AM Santos, RF Cook, RM Victor, RJF Câmara, ... BMC veterinary research 18 (1), 286 , 2022 2022.0 Citations: 17
Production, chemical composition, and fatty acid profile of milk from buffaloes fed with cupuaçu (Theobroma grandiflorum) cake and murumuru (Astrocaryum murumuru) cake in the … AGM e Silva, SCG de Lima, PD de Oliveira, MS Moraes, CMC Guimaraes, ... Animal Science Journal 92 (1), e13576 , 2021 2021.0 Citations: 16
Manejo alimentar de caprinos e ovinos nos trópicos MCP Rogério, AR Araújo, RCFF Pompeu, AG Maciel, E de Morais, ... Veterinária e Zootecnia 23 (3), 326-346 , 2016 2016.0 Citations: 16
A Review of the Nutritional Aspects and Composition of the Meat, Liver and Fat of Buffaloes in the Amazon LS Rodrigues, JAR Silva, WC Silva, ÉBR Silva, TS Belo, CEL Sousa, ... Animals 14 (11), 1618 , 2024 2024.0 Citations: 15
