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PRODUÇÃO DE BIOGÁS A PARTIR DE DEJETOS SUÍNOS: EFEITOS SAZONAIS NO RENDIMENTO DE METANO E NO DESEMPENHO DO BIODIGESTOR

2026-03-27T00:00:00Z

Título: PRODUÇÃO DE BIOGÁS A PARTIR DE DEJETOS SUÍNOS: EFEITOS SAZONAIS NO RENDIMENTO DE METANO E NO DESEMPENHO DO BIODIGESTOR Autor(es): Silva, Maria das Dores Xavier da Primeiro Orientador: Minafra, Cibele Silva Abstract: This study evaluated the influence of seasonal conditions on the biogas profile generated from swine manure treated in a German-type biodigester. The research was conducted at a finishing pig farm located in the municipality of Rio Verde, Goiás, Brazil, consisting of three production units and totaling approximately 28,000 animals.The residues, composed of feces, urine, feed leftovers, and wash water from the facilities, were subjected to mechanical agitation and subsequently directed to a Continuous Stirred-Tank Reactor (CSTR). The monitoring of biogas production and composition was carried out over a twelve-month period, covering different seasonal conditions, in order to assess the influence of climatic and operational factors on anaerobic digestion efficiency.Measurements were performed three times a day (at 08:00, 11:00, and 16:00) at a fixed point in the pipeline, using a portable digital multigas analyzer capable of quantifying the concentrations of carbon dioxide (CO2), methane (CH4), oxygen (O2), and hydrogen sulfide (H2S).Statistical analyses were conducted in the R environment (R Core Team, 2024), using Pearson correlation, Generalized Additive Models (GAM), and cluster analysis.The results indicated that the observed correlations confirm the influence of oxygen (O2) and temperature on methanogenesis and sulfidogenesis processes. CH4 and CO2 production showed seasonal stability, while O2 and H2S concentrations varied significantly, indicating greater sensitivity to climatic conditions. Cluster analysis demonstrated that more strictly anaerobic environments favor higher methane production.Thus, the integrated monitoring of gases and environmental factors is essential to ensure bioreactor stability, demonstrating that the efficiency of anaerobic digestion depends on the balance between microbiological processes and the adopted operational practices. Editor: Instituto Federal Goiano Tipo: Dissertação

INTERCROPPING MAIZE WITH Panicum maximum AND Stylosanthes CULTIVARS IMPROVES SILAGE PRODUCTION AND QUALITY IN INTEGRATED SYSTEMS

2026-03-20T00:00:00Z

Título: INTERCROPPING MAIZE WITH Panicum maximum AND Stylosanthes CULTIVARS IMPROVES SILAGE PRODUCTION AND QUALITY IN INTEGRATED SYSTEMS Autor(es): Matos, Wildo Pereira Primeiro Orientador: Costa, Kátia Aparecida de Pinho Primeiro Membro da Banca: Costa, Kátia Aparecida de Pinho Abstract: The adoption of silage production strategies focused on improving quality, combined with environmental conservation, is essential to ensure the production sustainability and the best use of resources. This study aimed to evaluate the effect of triple intercropping of Maize, Panicum maximum cultivars, and Stylosanthes on dry matter production, fermentation profile, and nutritional value of silages, compared to monoculture of these crops. The experiment was carried out in the field, in a randomized block design, with nine treatments and three replications. The following silage treatments were evaluated: Maize monoculture; tamani grass monoculture; Quenia guinea grass monoculture; Stylosanthes cv. Bela monoculture; Stylosanthes cv. Campo Grande monoculture; Maize intercropped with Tamani grass and Bela; Maize intercropped with tamani grass and Campo Grande; Maize intercropped with Quenia guinea grass and Bela; and Maize intercropped with Quenia guinea grass and Campo Grande. The results showed that the intercropping increased silage mass production and improved fermentative characteristics, with reductions of 10.91%; 25.03%; 37.43%; 33.94% and 26.68% in pH, buffering capacity, ammoniacal nitrogen, total dry matter losses and effluent production, respectively, compared to silages of Panicum maximum and Stylosanthes cultivars in monoculture. Furthermore, there was a 26.10% increase in crude protein content compared to Maize silage. Among the Stylosanthes cultivars, Bela showed the greatest intercropping capacity. Regarding the Panicum maximum cultivars, both can be recommended for intercropping. It is concluded that the Maize system with Panicum maximum and Stylosanthes cultivars can be recommended for silage production, focusing on sustainability and reducing costs with mineral fertilization. Keywords: Forage conservation; triple intercropping; legumes; sustainability. Editor: Instituto Federal Goiano Tipo: Dissertação

EXTRATO DE UVA NA ALIMENTAÇÃO DE CODORNAS JAPONESAS EM FINAL DE CICLO SUBMETIDAS AO ESTRESSE POR CALOR

2025-06-27T00:00:00Z

Título: EXTRATO DE UVA NA ALIMENTAÇÃO DE CODORNAS JAPONESAS EM FINAL DE CICLO SUBMETIDAS AO ESTRESSE POR CALOR Autor(es): Silva, Nathan Ferreira da Primeiro Orientador: Santos, Fabiana Ramos dos Primeiro Membro da Banca: Gomide, Ana Paula Cardoso Segundo Membro da Banca: Oliveira, Maria Cristina de Abstract: The objective was to evaluate the use of grape extract in the diet of Japanese quails at the end of the production cycle, subjected to heat stress, aiming at improvements in production performance, egg quality, physiological parameters, digestibility, as well as hepatic and intestinal functions. The experiment was conducted in a completely randomized design, with five treatments (0, 250, 500, 750, and 1000 mg/kg of grape extract), six replicates, and six birds per experimental unit, totaling 180 quails. Zootechnical performance, fresh and stored egg quality, behavior, thermal comfort, physiological parameters, blood biochemical profile, biometry and bone mineralization, nutrient digestibility, gastrointestinal and hepatic tract morphometry, ovarian follicle count, and hepatic biochemical indicators (GOT, GPT, cholesterol, triglycerides, and total proteins) were analyzed. Grape extract did not significantly affect (p < 0.05) the productive performance, behavior, or physiological variables of quails, but it positively influenced (p < 0.05) aspects of egg quality (Haugh unit, albumen pH, and yolk color), in addition to raising body temperature effect on thermoregulation and crude protein digestibility. Although it did not promote consistent improvements in overall performance, the data point to the antioxidant and functional potential of grape extract, supporting its use as a natural additive in diets for laying hens subjected to heat stress. Grape extract, although it does not mitigate the effects of heat stress on the performance, metabolism, welfare, and intestinal and hepatic health of Japanese quails at the end of the production cycle, improves egg quality at doses of 250 to 400 mg/kg and has thermogenic potential, suggesting further investigation in young birds or under thermal comfort conditions. Editor: Instituto Federal Goiano Tipo: Dissertação

ÁCIDOS ORGÂNICOS NA AQUICULTURA: BILIOMETRIA E REVISÃO SISTEMÁTICA

2025-03-14T00:00:00Z

Título: ÁCIDOS ORGÂNICOS NA AQUICULTURA: BILIOMETRIA E REVISÃO SISTEMÁTICA Autor(es): Melo, Gidelia Araujo Ferreira de Primeiro Orientador: Costa, Adriano Carvalho Primeiro Membro da Banca: Oliveira, Rodrigo Fortunato de Segundo Membro da Banca: Minafra, Cibele Silva Terceiro Membro da Banca: Paulino, Renan Rosa Paulino Abstract: Aquaculture is one of the fastest-growing agricultural activities in recent years, encompassing a lot of commercially important species. Its growth is driven by the rapid achievement of productive results, as many species are cultivated in short cycles and exhibit high feed conversion efficiency. In this context, food safety concerning microbiological variables is of utmost importance, as it is a highly perishable food that requires adequate quality control. Among the food quality assessment parameters, those related to microbiological quality stand out as the most significant, as they provide crucial information that allows for evaluation at various stages, including raw material acquisition, processing, storage, and distribution for consumption, considering shelf life and the associated health risks. Antimicrobials are essential for maintaining human and animal health; however, microbial resistance to antibiotics is a challenge to their effectiveness. In light of this, some alternatives have been explored, such as the use of organic acids. These compounds are already in use in some animal species, aiming to reduce or eliminate pathogenic microorganisms. In aquaculture, their use has been gaining increasing traction as a feed additive due to their effectiveness in improving zootechnical performance, modulating microbiota, and increasing animal survival rates. However, given the variability of results found in the literature regarding the effectiveness of organic acids in aquaculture whether in improving zootechnical performance or enhancing resistance to pathogenic challenges, this work aims to deepen the understanding of their use and impact, conducting a bibliometric analysis and systematic review that identifies scientific trends and challenges surrounding the topic. Beyond the academic context, the sustainability of organic acid use contributes to the teaching of Green Chemistry, providing students with a broader perspective on the role of chemistry in reducing environmental impacts in animal production. Using these compounds as an alternative to antibiotics in aquaculture is a strategy to minimize antimicrobial resistance and reduce chemical residues in aquatic ecosystems. Therefore, addressing this topic in the classroom can stimulate reflections on sustainable practices and the application of Green Chemistry principles in aquaculture, preparing students for a critical and innovative view of the future of aquaculture production. Editor: Instituto Federal Goiano Tipo: Dissertação