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Artigo
Efeito da inclusão de caroço de algodão na dieta sobre determinados parâmetros reprodutivos de touros Nelores
(2022-03-18) Nóbrega, Rogério Rondineli; Maitan, Paula Piccolo; Rezende, Adauton Vilela de; Silva, Délcio Bueno da; Magalhães, Geórgia Modé; Paiva, Felipe Augusto Pereira; Oliveira, Jackson Alípio Santos de; Nóbrega, Juan Henrique Ferreira; Palhão, Miller Pereira; Neves, Jairo Pereira
The aim of this study was to evaluate reproductive parameters of Nellore bulls by cottonseed (CS) addition with different concentrations of free gossypol in their diet. Twenty-eight animals (from 18 to 24 months) divided into 4 treatments were used in which (T1) was represented by animals that had no addition of CS (i.e. no free gossypol); (T2) addition of 860 g of CS - 1.65 g/of free gossypol/animal/day; (T3) addition of 1.72 g of CS - 3.30 g of free gossypol /animal day and (T4) addition of 2,580 g of CS - 4,95 g of free gossypol/animal/day. Blood samples for testosterone free evaluation, semen collection and testicular consistence were performed in 30-day intervals (D0, D30, D60, D90 and D120). Semen analysis consisted of of volume, appearance, pH, whirlpool, vigor, motility, concentration (/mL and /ejaculate) and sperm morphology. Testicular analysis consisted of of scrotal circumference, length and testicular width and testicular consistency. Sterilization were performed in day 121 for histopathological analysis. Free gossypol did not interfere in free testosterone, sperm concentration, major defects, scrotal circumference and testicular width. However, whirlpool, vigor, motility and minor defects were altered. Testicular length and consistence showed difference from day 60 (p<0,05). At histopathological evaluation, cytoplasmatic granules, nuclear pyknosis, fibrosis and sperm inside the seminiferous tubules showed to be different between treatments and control (T1) (p<0,05). Based on the results, free gossypol tends to interfere in some reproductive parameters and should be used carefully in bulls’ diet.
Artigo
Alterações congênitas proveniente de uma gestação trigemelar com conceptos de sexo oposto em bovinos associadas a biotécnicas reprodutivas
(2022-05-09) Souza, Fernanda Alice Penha de; Romio, César Vita Alves; Palhão, Miller Pereira; Maitan, Paula Piccolo
Livestock in Brazil is still characterized by low zootechnical rates. Through these perspectives, research on reproductive biotechnologies has increased with the aim of reversing this scenario to ensure high reproductive efficiency in herds. The main biotechnologies applied to bovine reproduction include artificial insemination (AI), fixed-time artificial insemination (FTAI), superovulation (SOV) and embryo transfer (ET) and in vitro embryo production (IVP). The FTAI is highly recommended in the field due to its high rate of reproductive performance. To perform this technique, it’s necessary to use hormones such as estrogenic esters, prostaglandin, equine chorionic gonadotropin (eCG) and progesterone. Due to the long half-life of this hormone, the eCG can lead to the occurrence of multiple ovulations generating twin births. By this, the aim of this study was to report a case of a freemartin heifer, with patent urachus, from a triplet pregnancy resulting from artificial insemination. At first evaluation, the heifer presented inappetence, weight loss, cachexia, dehydration, prostration, pale oral and ocular mucosa, temperature of 39.5°C and diarrhea. In the evaluation of the extracavitary umbilical structures, it was noted that the urine was excreted through the vulva and the umbilicus and the site had an increase in volume. After a day in the hospital, the animal died. At necropsy, it was found the absence of female sexual organs such as uterus and ovaries and in the abdominal region, presence of fluid in the cavities (ascites and hydrothorax) were observed. The suspected death cause was ureter stenosis that led to uremia.
dissertação
Entre humanos e algoritmos: a reconfiguração das práticas organizacionais mediadas por inteligência artificial à luz da teoria ator-rede
(Universidade Federal de Lavras, 2026-03-31) Oliveira, Willian Geraldo Amaral de; Brito, Mozar José de; Valadão, José de Arimatéia Dias; Andrade, Daniela Meirelles; Pinheiro, Daniel Calbino; Boava, Fernanda Maria Felício Macedo
The increasing incorporation of artificial intelligence (AI) systems into organizations has transformed how work is coordinated, decisions are made, and tasks are performed, posing new analytical challenges for the field of Management. This study investigates how the introduction and use of AI-based systems participate in the reconfiguration of organizational practices, drawing on analytical contributions from Actor-Network Theory (ANT). The research adopts a qualitative, exploratory, and descriptive approach, employing an integrative literature review as its method, following the model proposed by Torraco. Based on a corpus comprising 46 articles indexed in the Web of Science, published between 2013 and 2026, a thematic synthesis of empirical and theoretical evidence on the application of AI in organizational contexts was conducted. The findings indicate that the analyzed literature associates the presence of algorithmic systems with changes in coordination processes, decision-making practices, control mechanisms, and the production and circulation of knowledge. The analysis reveals that such transformations emerge from sociotechnical associations in which human actors and artifacts articulate in the stabilization of organizational practices. Based on this synthesis, the study proposes a conceptual framework that highlights how AI systems participate in the reconfiguration of organizational practices, contributing to the articulation between studies on artificial intelligence and sociotechnical approaches in the field of Management.
tese
Digital solutions for coffee and terroir studies: pedological perspectives and soil-enviroment relationships
(Universidade Federal de Lavras, 2026-08-14) Oliveira, Raul Silva; Menezes, Michele Duarte de; Silva, Sérgio Henrique Godinho; Silva, Maria Lígia de Souza; Faria, Rafael de Oliveira; Alves, Helena Maria Ramos
Terroir refers to the interaction between environmental factors and human action that influence the final quality of agricultural products. Although traditionally associated with viticulture, the concept has increasingly expanded into coffee production systems. In this context, soil properties, parent material, climate, relief, organisms, and crop management directly influence coffee fruit maturation and beverage sensory quality. From a pedological perspective, these factors can be interpreted as proxies for the stratification of agricultural areas into management zones, enabling the understanding of how different areas impact beverage quality and distinct coffee sensory profiles. In this context, digital tools may play a fundamental role in coffee terroir characterization by enabling the integration and mining of soil-environment data. Among these tools, Geographic Information Systems (GIS), proximal sensors, laboratory analyses, scientometric approaches, and machine learning algorithms stand out as important techniques for terroir studies. Therefore, this thesis aimed to apply digital solutions to coffee terroir studies in order to evaluate pedological perspectives and identify how soil-environment factors explain coffee maturation and beverage quality. The thesis was divided into three chapters: (i) the first chapter applies digital tools to support pedological perspectives by using scientometric approaches to identify the scientific panorama, advances, and research gaps related to the soil-terroir interface, in addition to a SWOT analysis containing strengths, weaknesses, opportunities, and threats associated with the integration of pedology into terroir studies; (ii) the second chapter employs GIS, proximal sensing, and conventional laboratory analyses as digital tools for data acquisition and terroir characterization in a coffee-producing area located within the Campo das Vertentes Geographical Indication region, subsequently applying association rule mining algorithms to investigate how agro-environment attributes influence different coffee ripness stages; (iii) the third chapter uses the same digital tools for terroir data acquisition and characterization in the same study area, combined with the Random Forest algorithm, to predict which soil-environment factors explain distinct coffee sensory profiles. The results demonstrate the potential of digital tools and data mining techniques for agricultural environment stratification and for understanding the influence of terroir on coffee maturation uniformity and beverage sensory profiles. Furthermore, this research contributes to consolidating a pedological approach to coffee terroir studies by providing methodological and analytical support for future investigations in this field.
dissertação
Sistemas de produção sustentáveis no manejo de pastagens na bovinocultura de leite e corte: diagnóstico participativo em um assentamento de reforma agrária no Triângulo Mineiro
(Universidade Federal de Lavras, 2026-05-27) Ferreira, Priscila Vivas; Pereira, Viviane Santos; Alves, Jacqueline Magalhães; Martins, Marcelo Rodrigues
Brazil stands out globally in beef and milk production and export, playing a significant role in the country's positive trade balance. However, the national livestock sector relies primarily on pastures, a large portion of which show some degree of degradation, particularly within the Cerrado biome. In this context, appropriate management practices and the adoption of sustainable production systems-such as pasture rehabilitation, rotational grazing, CropLivestock-Forest Integration (CLFI), and Agroforestry Systems (AFSs)-have proven to be effective alternatives for increasing productivity, restoring degraded areas, mitigating greenhouse gas emissions, and contributing to soil carbon sequestration. Furthermore, public policies like the ABC+ Plan and initiatives such as the Programa Rural Sustentável (PRS Cerrado, Sustainable Rural Program) have encouraged the adoption of low-carbon technologies in agriculture and livestock farming. This study focused on the Nova Santa Inês Settlement Program, located in the municipality of Santa Vitória in the Triângulo Mineiro region. The settlement lies within the Cerrado biome and falls under the scope of the PRS Cerrado program. It comprises 38 families whose primary economic activity is dairy and beef cattle farming. The study consists of a participatory diagnosis-involving data collection and planning with the family units-regarding the use of sustainable production systems for pasture management in dairy and/or beef cattle activities. The methodology employed was Participatory Rural Appraisal (PRA), which included document analysis, transversal walks, and a participatory workshop to develop a SWOT matrix, preceded by a discussion circle on sustainable pasture management systems. The results revealed a predominance of conventional pasture management systems characterized by low intensification, limited adoption of soil correction and fertilization practices, and minimal forage species diversification, with a clear dominance of Brachiaria grasses. It was found that producers have limited familiarity with the technical terminology related to sustainable production systems. During discussions, it was observed that while some participants were aware of specific conservationist practices, they did not associate them with concepts of integrated systems, such as Crop-Livestock Integration (CLI) and Crop-Livestock-Forestry Integration (CLFI). Furthermore, the absence or only incipient adoption of these systems was noted, linked to financial constraints, insufficient technical assistance, and limited access to high-quality information. A SWOT analysis revealed opportunities related to institutional support and public policies, as well as internal weaknesses and external threats hindering the transition to more sustainable production systems. In conclusion, adopting these systems depends on strengthening technical assistance, expanding access to credit, fostering social organization, and implementing strategies tailored to local realities, thereby contributing to pasture recovery, increased productivity, and reduced environmental impacts, in alignment with Sustainable Development Goal 12 (SDG 12) – Responsible Consumption and Production.