Publicações - ciências agrárias
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Matheus Fonseca Durães;
Matheus Menezes dos Santos
Palavra-chave:
RUSLE;
sediment transport;
empirical model;
Hydrology
Áreas do conhecimento:
Ciências Exatas e da Terra; Geociências; Geografia Física; Hidrogeografia;
Engenharias; Engenharia Civil; Engenharia Hidráulica; Hidrologia;
CIENCIAS_AGRARIAS; Engenharia Agrícola; Engenharia de Água e Solo; Conservação de Solo e Água
resumo ...
(en)
Land use can be considered one of the main variables impacting watershed erosion. During the past decades, extensive native areas have been reclaimed along the central-western region of Espirito Santo State in Brazil, while agricultural pressures on landcover-sedimentation are in some degree unknown. This study aims to analyze the impacts of landcover policy on sediment yield in the Guandu river basin (GRB), Brazil after the introduction of the Native Vegetation Protection Law (NVPL). For this purpose, it was implemented a multidisciplinary approach that combines sediment records and mathematical modeling to estimate soil erosion for the years 2012 and 2021. The effect of land cover modifications was studied using suspended sediment records and satellite image data for the period. The dynamics of sediment production and transport in the main channel in the two periods studied had changed, indicating that NVPL showed considerable efficiency after its implementation as a public policy. Sediment concentration observed from the monitoring gauges ranged from 0.26 t⋅ha-1⋅year-1 to 1.68 t⋅ha-1⋅year-1 in 2012, and 0.40 t⋅ha-1⋅year-1 to 0.76 t⋅ha-1⋅year-1 for the year 2021. In terms of sediment delivery ratio (SDR), the year 2012 presented the mean annual value of 8.5%, while 2021 showed a mean annual value of 6.2%. These results have provided important information for measures associated with the management, conservation and planning of land use in the basin, which of great importance when predicting the development of various scenarios for the GRB and the application of conservation policy.
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O uso da terra pode ser considerado uma das principais variáveis que afetam a erosão das bacias hidrográficas. Durante as últimas décadas, extensas áreas nativas foram recuperadas ao longo da região centro-oeste do Estado do Espírito Santo, no Brasil, enquanto as pressões agrícolas sobre a cobertura da terra e a sedimentação são, até certo ponto, desconhecidas. Este estudo tem como objetivo analisar os impactos da política de cobertura da terra sobre a produção de sedimentos na bacia do rio Guandu (GRB), Brasil, após a introdução da Lei de Proteção da Vegetação Nativa (LPVN). Para esse fim, foi implementada uma abordagem multidisciplinar que combina registros de sedimentos e modelagem matemática para estimar a erosão do solo para os anos de 2012 e 2021. O efeito das modificações na cobertura da terra foi estudado usando registros de sedimentos suspensos e dados de imagens de satélite para o período. A dinâmica da produção e do transporte de sedimentos no canal principal nos dois períodos estudados foi alterada, indicando que o NVPL apresentou eficiência considerável após sua implementação como política pública. A concentração de sedimentos observada nos medidores de monitoramento variou de 0,26 t⋅ha-1⋅ano-1 a 1,68 t⋅ha-1⋅ano-1 em 2012, e de 0,40 t⋅ha-1⋅ano-1 a 0,76 t⋅ha-1⋅ano-1 para o ano de 2021. Em termos de taxa de entrega de sedimentos (SDR), o ano de 2012 apresentou o valor médio anual de 8,5%, enquanto 2021 mostrou um valor médio anual de 6,2%. Esses resultados forneceram informações importantes para medidas associadas ao gerenciamento, à conservação e ao planejamento do uso da terra na bacia
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FRANÇA, TATIANE OTTO DE;
MARTINS, BÁRBARA;
OLIVEIRA, BRUNO GONÇALVES DE;
Luis Antonio Biasi;
BOTELHO, RENATO VASCONCELOS;
JORDÃO, ANTÓNIO M.
Palavra-chave:
viticultura;
vitis vinifera;
compostos fenólicos
Áreas do conhecimento:
CIENCIAS_AGRARIAS; Agronomia; Fitotecnia; Manejo e Tratos Culturais
resumo ...
The use of new grape cultivars is essential for the continued development of Brazilian viticulture. Thus, this study aimed to determine the general physicochemical parameters, global phenolic composition, and antioxidant capacity of grape musts from the Portuguese red variety ‘Touriga Nacional’ during ripening in two Brazilian vineyards (states of Rio Grande do Sul and Santa Catarina). The results were compared with data obtained from the same variety cultivated in a vineyard located in northern Portugal, which is the region of origin of this variety. This research was conducted over three consecutive vintages (2022–2024). Overall, the results indicated that soil and climate conditions at each location were associated with differences in the composition of ‘Touriga Nacional’ grape musts. Grapes from both Brazilian vineyards showed significantly higher berry weight, must volume, and yield compared with grapes collected from the Portuguese vineyard. On the other hand, grapes collected from the vineyard located in the state of Santa Catarina exhibited the highest values of total titratable acidity, malic acid, total phenols, flavonoids, total anthocyanins, and chromatic characteristics. Nevertheless, grapes collected from the Portuguese vineyard showed higher values of total tannins. The results suggest that the ‘Touriga Nacional’ variety shows better adaptation to the conditions of the Santa Catarina vineyard than to those of the Rio Grande do Sul vineyard. These findings help winegrowers, particularly in southern Brazil, to have more options for introducing different grape varieties, thereby contributing to the production of wines with distinctive characteristics, while consumers will have access to a greater diversity of wines available on the market.
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PALUDETO, JOÃO GABRIEL ZANON;
MARCATTI, GUSTAVO EDUARDO;
ESTOPA, REGIANE ABJAUD353;T;283;, JAROSLAV;
João Carlos Bespalhok Filho;
RESENDE, RAFAEL TASSINARI
Palavra-chave:
Interação Genótipo Ambiente;
Melhoramento de plantas
Áreas do conhecimento:
CIENCIAS_AGRARIAS; Recursos Florestais e Engenharia Florestal; Silvicultura; Genética e Melhoramento Florestal
resumo ...
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Fernando Andrade Souza;
Geraldo Francisco dos Santos Júnior;
WALLYSON RAFAEL MACHADO SANTOS;
Mayara Silvestre;
Natalia Santana Siqueira de Lara;
Rafael Augusto Satrapa;
Luciane Maria Laskoski;
KOZICKI, L.E.;
Pedro Henrique Lomba de Lima
Áreas do conhecimento:
CIENCIAS_AGRARIAS; Medicina Veterinária; Reprodução Animal; Biotecnologia Aplicada a Reprodução Animal
resumo ...
(en)
The present study aimed to evaluate the pregnancy rate following fixed-time artificial insemination (FTAI) in Nelore cattle supplemented with either long-acting progesterone (Experiment 1) or an injectable nutritional complex (Experiment 2). In Experiment 1, multiparous cows underwent estrus synchronization and were inseminated on day D10 (D0 = first day of synchronization). On D15, animals were assigned to a control group (n = 166), which received an intramuscular injection of 0.5 mL of 0.9% NaCl solution, or to a treated group (n = 147), which received 0.5 mL of long-acting progesterone (150 mg). In Experiment 2, heifers were divided into a control group (n = 108), which received no treatment, and a treated group (n = 99), which received an intramuscular injection of a nutritional supplement on D0 of synchronization. After 7 days of FTAI, all cows and heifers were maintained with bulls for natural mating (20 females per bull) for the following 45 days. Pregnancy diagnosis was performed 70 days after FTAI. The pregnancy rate was higher in the treated groups for both experiments (53.1% vs. 42.8% in Experiment 1, and 53.7% vs. 38.8% in Experiment 2), although differences were not statistically significant (p > 0.05). In animals that did not conceive, ovarian cyclicity was not suppressed, indicating that the use of long-acting progesterone or nutritional supplementation did not interfere with the return to estrus. In conclusion, supplementation with long-acting progesterone or an injectable nutritional complex tended to improve pregnancy rates in Nelore cattle subjected to FTAI, without residual inhibitory effects on subsequent ovarian activity.
(pt)
The present study aimed to evaluate the pregnancy rate following fixed-time artificial insemination (FTAI) in Nelore cattle supplemented with either long-acting progesterone (Experiment 1) or an injectable nutritional complex (Experiment 2). In Experiment 1, multiparous cows underwent estrus synchronization and were inseminated on day D10 (D0 = first day of synchronization). On D15, animals were assigned to a control group (n = 166), which received an intramuscular injection of 0.5 mL of 0.9% NaCl solution, or to a treated group (n = 147), which received 0.5 mL of long-acting progesterone (150 mg). In Experiment 2, heifers were divided into a control group (n = 108), which received no treatment, and a treated group (n = 99), which received an intramuscular injection of a nutritional supplement on D0 of synchronization. After 7 days of FTAI, all cows and heifers were maintained with bulls for natural mating (20 females per bull) for the following 45 days. Pregnancy diagnosis was performed 70 days after FTAI. The pregnancy rate was higher in the treated groups for both experiments (53.1% vs. 42.8% in Experiment 1, and 53.7% vs. 38.8% in Experiment 2), although differences were not statistically significant (p > 0.05). In animals that did not conceive, ovarian cyclicity was not suppressed, indicating that the use of long-acting progesterone or nutritional supplementation did not interfere with the return to estrus. In conclusion, supplementation with long-acting progesterone or an injectable nutritional complex tended to improve pregnancy rates in Nelore cattle subjected to FTAI, without residual inhibitory effects on subsequent ovarian activity.
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Shelley W. Cochran;
Lynsey Wagner;
Christine Molter;
Melissa Hanson;
Laura Rice;
SHAW, GILLIAN C.;
Fabiano Montiani Ferreira;
MOORE, BRET A.
VETERINARY OPHTHALMOLOGY,
v. 26,
n. 26,
p. 1-9,
2026
Palavra-chave:
retina;
retinal degeneration;
exotic animals;
wild animal ophthalmology;
Tapir
Áreas do conhecimento:
CIENCIAS_AGRARIAS; Medicina Veterinária; Clínica e Cirurgia Animal; Oftalmologia Veterinária;
CIENCIAS_AGRARIAS; Medicina Veterinária; Clínica e Cirurgia Animal; Medicina de Animais Selvagens
resumo ...
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Marcos Vinícius da Silva Alves de Lima;
Amanda Ferreira de Oliveira;
Andrielly Peruzzo Mastaler;
DANIELA BIONDI
Urban Transformations,
v. 8,
n. 7,
p. 1-21,
2026
Palavra-chave:
Geoprocessing,;
Landscape metrics;
Protection area;
Ecosystem Services
Áreas do conhecimento:
CIENCIAS_AGRARIAS; Recursos Florestais e Engenharia Florestal; Ecologia e Estudos da Paisagem;
CIENCIAS_AGRARIAS; Recursos Florestais e Engenharia Florestal; Conservação da Natureza; Recuperação de Areas Degradadas;
CIENCIAS_AGRARIAS; Recursos Florestais e Engenharia Florestal; Silvicultura; Fisiologia Florestal
resumo ...
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VOITENA, JÉSSICA N.;
MARINHO, TATIANE O. C.;
Fabiano Montiani Ferreira;
CREMONINI, DANIELA N.;
CHIURCIU, JOÃO L. V.;
JESUS, NADJA S.;
POHLE, ANA P. V. B.;
DA CUNHA, OLICIES;
Brito, Fábio L. C.
Palavra-chave:
braquicefálicos;
Oftalmologia Veterinária;
tear production
Áreas do conhecimento:
CIENCIAS_AGRARIAS; Medicina Veterinária; Clínica e Cirurgia Animal; Oftalmologia Veterinária;
CIENCIAS_AGRARIAS; Medicina Veterinária; Clínica e Cirurgia Animal; Clínica Veterinária
resumo ...
The precorneal tear film is critical for ocular surface health, and brachycephalic dogs are particularly predisposed to tear film instability due to their unique conformation. This study aimed to establish normative values for tear film parameters in healthy brachycephalic dogs using the OSA-Vet®, including Schirmer tear test-1 (STT-1), tear meniscus height (TMH), and non-invasive tear breakup time (TBUTNI). Forty brachycephalic dogs (66 eyes) with STT-1 values between 15 and 25 mm/min underwent complete ophthalmological examination and OSA-Vet® evaluation. Data were analyzed for distribution, descriptive statistics, and correlations. Median values were 20 mm/min [19–22] for STT-1, 0.45 mm [0.36–0.62] for TMH, and 1.25 s [0.70–4.00] for TBUTNI. Spearman’s analysis revealed no significant association between STT-1 and TMH (ρ = 0.136, p = 0.277) or between TMH and TBUTNI (ρ = 0.046, p = 0.716). A weak positive correlation was observed between STT-1 and TBUTNI (ρ = 0.256, p = 0.038). These results demonstrate that even in dogs with preserved aqueous tear production, TBUTNI values remain low and variable, highlighting the predisposition of brachycephalic breeds to evaporative instability. TMH showed limited diagnostic value, underscoring the importance of multimodal tear film assessment. Previous studies have used OSA-Vet® to evaluate ocular surface parameters across cephalic conformations. The present study focuses specifically on establishing clinically applicable reference values in phenotypically brachycephalic dogs screened for normal aqueous tear production.
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Euclides Silva;
André Braga;
Silvio Peixoto;
Eulalio Arámbul-Muñoz;
Eduardo Luis Cupertino Ballester;
Rossineide Rocha
Palavra-chave:
bft;
carbon source
Áreas do conhecimento:
CIENCIAS_AGRARIAS; Recursos Pesqueiros e Engenharia de Pesca; Aqüicultura; Piscicultura
resumo ...
(en)
This study evaluated alternative carbohydrate sources available in the Brazilian Amazon for use in biofloc systems for the cultivation of white shrimp ( Penaeus vannamei ). The motivation stems from the limited accessibility in this region of sugarcane molasses, a conventional carbon source for the production of bioflocs. Four sources of carbohydrates were tested: coffee grounds, cassava meal, tapioca starch, and molasses, for 35 days. Juvenile shrimp (initial weight 0.14 g) were stocked at a density of 300 ind m -3 in 12 70-L polyethylene tanks, across four treatments with three replications. The effects of the springs on water quality, zootechnical performance of shrimp, and centesimal composition of biofloc and animals were evaluated. All sources maintained water quality within the recommended range for the species. However, the molasses treatment resulted in significantly higher zootechnical performance, with a final weight of 0.61 g and a weekly gain of 0.09 g ( P < 0.05). Regarding composition, only moisture content varied significantly between treatments, and coffee grounds and molasses differed from cassava meal and tapioca gum. In addition, shrimp produced with coffee grounds differed significantly from those treated with tapioca gum. In conclusion, although molasses yielded the best performance, all alternative sources also proved efficient. The results show the potential of regional inputs as viable alternatives, expanding the applicability of biofloc technology in areas where molasses is not readily available, contributing to the consolidation of aquaculture practices adapted to Amazonian conditions, and promoting greater productive and environmental autonomy in the activity.
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Luis Otávio Marchi de Araújo;
Pinto, M.A.V.;
Jotair Elio Kwiatkowski Júnior;
Daniel Rigoni
Journal of the Brazilian Society of Mechanical Sciences and Engineering,
v. 48,
n. 3,
p. 1-12,
2026
DOI
Palavra-chave:
Grain aeration;
Thorpe model;
Explicit upwind difference scheme;
Grain moisture content
Áreas do conhecimento:
Ciências Exatas e da Terra; Matemática; Matemática Aplicada; Análise Numérica;
Engenharias; Engenharia Mecânica; Fenômenos de Transporte; Transferência de Calor;
CIENCIAS_AGRARIAS; Engenharia Agrícola; Engenharia de Processamento de Produtos Agrícolas; Armazenamento de Produtos Agrícolas
resumo ...
The grain aeration process within silos is an essential operation for grain storage management, focusing on the control of temperature and moisture content of the stored grain mass. While thermal dynamics are frequently modeled, a research gap exists concerning more comprehensive analyses of moisture content behavior and investigations into the role of independent variables governing the distribution of both properties throughout the entire silo. This study provides a numerical analysis of the spatio-temporal dynamics of temperature and moisture content during aeration, aiming to establish an understanding of their distribution throughout the silo, with particular emphasis on moisture analysis. The one-dimensional mathematical model proposed by Thorpe was adopted. Numerical solutions were obtained using the finite difference method with a fully explicit upwind difference scheme. Model parameters were aligned with experimental data to enable robust validation of the temperature results and subsequent code verification. Findings reveal the existence of two unidirectional fronts, one of drying and another of rehumidification, and, while thermal equilibrium is achieved relatively quickly, moisture content exhibits a significantly slower and more complex stabilization, requiring approximately five times longer to reach equilibrium. Furthermore, the aeration process was observed to cause a slight drying effect, a loss of moisture content of about 2.8%. This paper underscores the critical importance of considering both temperature and moisture dynamics for effective grain storage management, offering a reliable framework for optimizing aeration strategies in practical applications.
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BACH, MARIANA BOLZANI;
PIMPÃO, CLAUDIA TURRA;
PEROTTA, JOÃO HENRIQUE;
DE BARROS FILHO, IVAN ROQUE;
GIUFFRIDA, ROGÉRIO;
LESCANO, SUSANA ANGÉLICA ZEVALLOS;
LUHM, KARIN REGINA;
FIGUEIREDO, FABIANO BORGES;
FACHIN, CAMILA GIRARDI;
Fabiano Montiani Ferreira;
SANTARÉM, VAMILTON ALVARES;
KMETIUK, LOUISE BACH;
Biondo, Alexander Welker;
FREITAS, AARONSON RAMATHAN;
GUARESCHI, BIANCA LUIZA VALDUGA;
FERREIRA, ISABELLA BRAGHIN;
DE SOUZA FILHO, ROBERTO TEIXEIRA;
RODRIGUES E FONSECA, GABRIELA;
DE ALVARENGA, FERNANDA MURARO;
DELAI, RUANA RENOSTO;
et.al
Palavra-chave:
one heatlh;
retina;
retinopathy;
Zoonosis;
small animals
Áreas do conhecimento:
CIENCIAS_AGRARIAS; Medicina Veterinária; Clínica e Cirurgia Animal; Oftalmologia Veterinária;
Ciências da Saúde; Medicina; Clínica Médica; Oftalmologia;
CIENCIAS_AGRARIAS; Medicina Veterinária; Clinica de pequenos animais
resumo ...
Although toxocariasis has been considered a common and important neglected zoonotic parasitic disease worldwide, serologic ownership risk and owner-dog concomitant ophthalmic assessment remain to be fully established. Meanwhile, high toxocariasis prevalence has been recently found in seashore areas of southern Brazil. Accordingly, the present study aimed to perform owner serologic, fecal/hair dog, and owner- dog ophthalmic assessment in an endemic seashore area of southern Brazil. In overall, 112/342 (32.75%) owners were seropositive to anti-Toxocara spp. IgG antibodies by ELISA, with family income statistically significant (p = 0.007) as associated risk factor in the univariate analysis. In addition, Toxocara spp. eggs were visualized in only 6/216 (2.78%) dog feces and 5/236 (2.12%) dog hair samples. Logistic regression indicated that untreated water increased 6.3-fold the dog likelihood for T. canis eggs in hair or feces, while purebred dogs and outdoor access were considered as associated protective factors. Only one/342 individual presented highly suggestive ocular toxocariasis, in one eye and at the cicatricial stage (seropositive for anti-Toxocara IgG antibodies). Out of an additional 32 individuals with some degree of retinal scarring compatible with prior chorioretinitis, 10/32 (31.3%) were also seropositive for anti-Toxocara IgG antibodies. In addition, ophthalmic abnormalities were identified in 205/237 (86.5%) examined dogs, with the most frequent findings involving various nonspecific chronic lesions in 177/237 (74.7%), followed by Florida Spot Keratopathy (FSK) in 12/237 (5.1%) and retinopathy in 11/237 (4.6%) dogs. FSK prevalence in dogs was considered very high. Although less prevalent, fundoscopic changes were significantly associated with Toxocara spp. in both owners and their dogs. In conclusion, similar ophthalmologic abnormalities associated with shared environmental exposure to Toxocara spp. have highlighted the importance of One Health approach for holistic interpretation of human-dog natural occurrence of toxocariasis.
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