Principais Coleções do Repositório
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Frangos alimentados com dietas contendo gordura de larvas de inseto em substituição ao óleo de soja
(Universidade Federal de Lavras, 2025-09-26) Almeida, Yan Andrade; Naves, Luciana de Paula; Orientador; Fonseca, Leonardo da Silva; Leão, Ana Patrícia Alves; dc.contributor.referee1; dc.contributor.referee2; dc.contributor.referee3; dc.contributor.referee4; dc.contributor.referee5
In poultry farming, the main source of lipids used in bird nutrition is soybean oil; however, alternative sources are important to increase the range of possibilities for the sector. In this context, black soldier fly larvae fat (BSLF) has become a possibility, as it presents an approximate yield of 40%, being rich in medium-chain fatty acids, such as lauric acid, which exhibits nutritional properties, in addition to antimicrobial functions and modulation of intestinal health. This research aimed to determine the effects of the increasing substitution of soybean oil (SO) by BSLF on parameters of lipid metabolism and the immune system, correlating them with the performance of broiler chickens. Five hundred broiler chickens were used, distributed in a completely randomized design, and five levels of soybean oil substitution by BSLF (0, 25, 50, 75 and 100%) in mash rations were evaluated. Each diet was evaluated in ten replicates with 10 birds each. Water and experimental feed were provided ad libitum from 22 to 38 days of age. The parameters analyzed were zootechnical performance, determined from 22 to 38 days of age, corresponding to feed consumption, weight gain, and feed conversion ratio of the chickens. On the 38th day of age, one chicken from each experimental unit was slaughtered to evaluate carcass and cut yield and to collect samples of pancreas, liver, and pectoralis major muscle, in which pancreatic lipase activity and the concentrations of hepatic fatty acid synthase and muscle carnitine were determined, respectively. In addition, during bleeding, blood aliquots were collected for subsequent quantification of interleukin-10 (IL-10) and tumor necrosis factor alpha (TNF-α) levels. There was no difference (P > 0.05) in the zootechnical performance of the chickens. However, 100% replacement of OS with GBSF resulted in higher (P < 0.05) breast yield. There was no change (P > 0.05) in pancreatic lipase activity, hepatic fatty acid synthase concentration, or serum concentrations of IL-10 and TNF- α (P > 0.05). However, increasing the rate of replacement of OS with GBSF resulted in a linear reduction in carnitine concentration in the chicken breast. It is concluded that increasing replacement of OS with GBSF does not induce modulation of pancreatic lipase and hepatic fatty acid synthase enzymes and does not alter the immune system of chickens. Total replacement of GBSF does not impair zootechnical performance, increases breast yield, and reduces carnitine concentration in the breast.
Anais do Simpósio Internacional de Ecologia Aplicada
(Ed. dos Autores, 2025-10-14) Rafael Dudeque Zenni (Organizador); Alessandra Angélica de Pádua Bueno (Organizador); Maria Fernanda Gomes Villalba Peñaflor (Organizador); Paulo dos Santos Pompeu (Organizador)
Anais do Simpósio Internacional de Ecologia Aplicada
Mapping of lignin distribution in the wood fiber wall of Corymbia citriodora by confocal raman microscopy
(2025-12-18) Lima, José Tarcício
Mapping of lignin distribution in the wood fiber wall of Corymbia citriodora by confocal Raman microscopy”, which aims to map lignin in the layers of the wood fiber wall of Corymbia citriodora using confocal Raman microscopy. The database mainly refers to .opus files collected during the scanning carried out within the confocal Raman microscope system itself. Based on this database, maps of lignin distribution in the wood fiber wall were produced.
3D printing with citronella- incorporated resins: exploring printability and essential oil retention in hardened materials
(Universidade Federal de Lavras, 2025-09-25) Salaudeen, Abdulqudus Tope; Ferreira, Saulo Rocha; Gil, Camila Silva Brey; Barrioni, Breno Rocha; Martins, Talita; Dias, Matheus Cordazzo
This study investigates the incorporation of citronella essential oil into water-washable UV-curable resin to fabricate 3D-printed materials and evaluates the combination of both oil and resin. Formulations with 0%, 5%, 10%, and 15% (v/v) citronella oil were analyzed for curing kinetics under UV exposure (405 nm source, exposure times 15–210 s), chemical structure, thermal stability, thermal transitions, mechanical performance, and insect repellency. GC-MS analysis identified the oil's volatile terpenoid composition, predominantly geraniol (28.79%), citronellal (24.33%), and citronellol (16.49%), which governed all observed properties. Results showed that higher oil loadings delayed UV-curing and reduced final mass due to terpene volatilization. A concentration-dependent reduction in initial thermal stability was observed, while the main polymer degradation temperature remained largely unchanged. FTIR confirmed physical encapsulation via non-covalent interactions, and DSC revealed a plasticization effect, indicated by a decrease in glass transition temperature (Tg) from 133 °C to 128 °C. Mechanical testing showed a trade-off, with oil reducing tensile strength and modulus but enhancing ductility up to 10% loading, beyond which phase separation caused property deterioration. Repellency assays against Musca domestica confirmed strong bioactivity, with the 15% formulation sustaining significant efficacy after 10 days. These findings underscore a critical compromise between material performance and functionality, establishing an optimal formulation window of 5–10% citronella oil for developing durable, insect-repellent 3D-printed products for agricultural and consumer applications.
Diagnóstico da degradação de pastagens no município de Tangará da Serra Mato Grosso decorrente da produção de bovinos
(Universidade Federal de Lavras, 2025-07-28) Ramos, Gislaine Edicely da Costa; Gionbelli, Mateus Pies; Orientador; Nascimento, Karolina Batista; Meneses, Javier Andrés Moreno; dc.contributor.referee1; dc.contributor.referee2; dc.contributor.referee3; dc.contributor.referee4; dc.contributor.referee5
The study “Diagnosis of Pasture Degradation in the Municipality of Tangará da Serra – MT, Resulting from Cattle Production” focused on evaluating management practices in 40 rural properties, identifying the factors that contribute to pasture degradation. In this regard, practices such as the low frequency of soil analysis, absence of nitrogen fertilization, and the use of inadequate forage species intensify the degradation process. The study revealed relevant social, technological, economic, and cultural impacts, such as the limited adoption of technologies and the persistence of outdated management practices among family farmers. With a clear extension-oriented character, the project actively involved local producers through interviews, contributing to the construction of participatory solutions adapted to the local reality. The research covered the municipality of Tangará da Serra, encompassing small and medium-sized family farmers as the target audience, distributed among the largest rural communities. The 40 interviewed producers were directly benefited, as well as the Municipal Department of Agriculture and other stakeholders interested in the research, such as technicians and students. The impacts of the research fall within the thematic areas of the National Extension Policy — Environment, Technology and Production, and Labor — promoting sustainable practices, rational land use, and socioeconomic inclusion. Furthermore, the study is aligned with several of the 17 Sustainable Development Goals (SDGs) of the United Nations (UN), such as Zero Hunger and Sustainable Agriculture, Decent Work and Economic Growth, Industry, Innovation and Infrastructure, Responsible Consumption and Production, Climate Action, and Life on Land, reinforcing its potential to contribute to the sustainable transformation of livestock production in degraded pasture areas. Thus, the objectives pursued by this study highlight highly relevant elements that may contribute to the development of scientific research, the implementation of public policies, subsidized credit programs, and technical assistance actions, in addition to generating significant social and environmental results in the face of climate change.