Tese/dissertação (CPPSUL) https://www.alice.cnptia.embrapa.br/alice/handle/item/291 2026-04-05T05:08:21Z 2026-04-05T05:08:21Z FONSECA NETO, A. M. da RUFINO, C. F. G. HADDAD, F. CHAVES, F. F. STUTZ, L. C. VIEIRA, O. V. https://www.alice.cnptia.embrapa.br/alice/handle/doc/1166951 2025-03-16T05:55:48Z 2024-01-01T00:00:00Z

Título: Padrões Voluntários de Sustentabilidade: estudos de caso de mecanismos de operação e modelos de negócios de programas de certificação para agricultura sustentável. Autoria: FONSECA NETO, A. M. da; RUFINO, C. F. G.; HADDAD, F.; CHAVES, F. F.; STUTZ, L. C.; VIEIRA, O. V. Conteúdo: O movimento global de compromisso com a agenda climática já se reflete nas estratégias de empresas que atuam direta ou indiretamente na cadeia do agro. É crescente a pressão ambiental que os principais produtos da pauta de exportações agrícolas brasileiras vêm sofrendo, com foco principal na redução do desmatamento e na ampliação da adoção e demonstração de que os efeitos de boas práticas agrícolas de fato reduzem a pegada de carbono das cadeias agrícolas. Tal demonstração é feita a partir de indicadores mensuráveis, reportáveis e verificáveis baseados na melhor ciência possível. A inovação orientada à sustentabilidade preconiza que as organizações contribuam de forma efetiva para a adoção de compromissos de redução das emissões de gases de efeito estufa, tendo como destaque a visão de que a jornada de sustentabilidade seja pautada, entre outros fatores, na construção de sistemas setoriais, e não seja considerada como um atributo de uma única empresa, mas idealmente deve ser aplicada adequadamente em nível global. Nesse contexto, as Normas Voluntárias de Sustentabilidade (NVS) podem se tornar um importante agente de profunda reestruturação do papel da agricultura em agendas descarbonizantes. A partir da abordagem de estudos de casos múltiplos, este trabalho se propõe a analisar os mecanismos de funcionamento de três NVS distintas que estão em operação no mercado: a certificação de soja RTRS (Round Table on Sustainable Soybean), um programa de certificação voluntária de produto agrícola; o programa SBTi (Science Based Target initiative), que certifica compromissos voluntários de empresas e organizações com metas de redução de carbono e net zero; e, por fim, a certificação Verified Carbon Standard (VCS), da Verra, que atua no mercado de créditos de carbono, certificando projetos elegíveis para emissão de créditos de carbono. Para a condução dos estudos de caso, este trabalho realiza uma revisão bibliográfica sobre a emergência dos padrões voluntários de sustentabilidade, apresenta um panorama do mercado de carbono regulado x mercado de carbono voluntário e conceitos-chaves relacionados ao papel de certificações voluntárias de sustentabilidade na agricultura. Como produto tecnológico deste projeto aplicado, foi desenvolvida a "Ferramenta de análise para Normas Voluntárias de Sustentabilidade (NVS)", um conjunto de 5 temas e 31 indicadores que permitiu melhor estruturar os casos estudados, bem como apresentar informações estruturadas à Embrapa objetivando subsidiá-la no desenvolvimento de novos protocolos ligados à descarbonização. The global movement towards committing to the climate agenda is already reflected on the strategies of companies that operate directly or indirectly in the agribusiness chain.There is an increasing environmental pressure on the main products of brazilian agricultural exports, mainly focused on deforestation and on the expansion of the adoption and demonstration that good agricultural practices in fact reduce the carbon footprint of agricultural chains. Such demonstration is made through measurable, reportable and verifiable indicators, derived from the best science available. Sustainability-oriented innovation advocates that organizations should contribute effectively to the adoption of commitments to reduce greenhouse gas emissions, emphasizing that the sustainability journey should be guided, among other factors, by the construction of sectoral systems, and not be considered as an attribute of a single company, but ideally applied appropriately at a global level. In this context, Voluntary Sustainability Standards (VSS) can become an important agent for a profound restructuring of the role of agriculture in decarbonization agendas. Using a multiple case study approach, this work aims to analyze the operating mechanisms of three distinct VSS currently in the market: the RTRS (Round Table on Sustainable Soybean) certification, a voluntary agricultural product certification program; the SBTi (Science Based Target initiative), which certifies voluntary commitments of companies and organizations to carbon reduction and net zero targets; and finally, the Verified Carbon Standard (VCS) certification by Verra, which operates in the carbon credit market, certifying projects eligible for carbon credit issuance. To conduct the case studies, this work carries out a literature review on the emergence of voluntary sustainability standards, presents an overview of the regulated carbon market vs. the voluntary carbon market, and key concepts related to the role of voluntary sustainability certifications in agriculture. As a technological product of this applied project, the "Analysis Tool for Voluntary Sustainability Standards (VSS)" was developed, a set of 5 themes and 31 indicators that allowed better structuring of the studied cases.

2024-01-01T00:00:00Z CAMPOS, G. S. https://www.alice.cnptia.embrapa.br/alice/handle/doc/1099079 2025-03-16T03:49:35Z 2017-01-01T00:00:00Z

Título: Seleção e associação genômica ampla para características de crescimento e escores visuais em bovinos da raça Hereford e Braford. Autoria: CAMPOS, G. S. Conteúdo: This thesis was structured in three chapters. In the first one, the genetic parameters were estimated using linear and threshold models for the traits of visual scores and also the cross validation and multinomial regression were used for validation of the models. There was no difference in the parameter estimation when the scores had normal distribution, such as for conformation, precocity, musculature and size. Heritability values (h2) ranged from 0.18 to 0.26 with the linear model and from 0.19 to 0.29 with the threshold. However, when the score had no normal distribution, such as navel, there were advantages in using the threshold model, with a h2 value of 0.42 and a linear model of 0.22. The second study aimed to evaluate the accuracy genomic predictions using different methods, for growth traits and visual scores obtained at weaning and yearling in cattle of the Hereford and Braford breeds. Phenotype data 126,290 animals belonging to the Delta G Connection breeding program and a set of 3,552 genotyped animals were used. The GBLUP, BayesB and BayesC methods were tested and higher accuracy were obtained with Bayesian methods. For the growth traits, greater gain in accuracy compared to the traditional method (BLUP) was with the BayesB methodology for birth weight (BW) of 23.8%, and for the visual scores it was for size at the yearling (SY), of 29.8% with the BayesB and BayesC methods. For the approaches combining all sources of information, greater gains were obtained with the single-step ssGBLUP methodology. Among all the characteristics, for weaning measures, the average gain was 40.7% for the weaning measures and 36.7% for yearling. Lower prediction accuracy was observed in the groups containing only Hereford cattle, indicating that the training set composed of the majority of Braford animals will not estimate accurate predictions for the Hereford in the validation set. The third study aimed to perform a genome wide association study (GWAS) using Bayesian methodology to identify the most representative genomic regions and SNPs associated with growth traits. It was selected the most representative windows and the SNPs that explained more than 20% of the genetic variance estimated for the traits studied. After this selection, the most informative SNPs regarding parameters, model frequency (MF), t-like (TL), linkage disequilibrium (DL) and minor allele frequency (MAF) were used in a panel of low density. Reduced panel accuracy was estimated from crossvalidation, using k-means and random clustering methods. Higher accuracy estimates were obtained for weaning characteristics. Greater gains in accuracy can be obtained if more animals are genotyped and phenotyped. These panels may be useful for future studies related to fine mapping for the discovery of causal variants and are an interesting alternative for reducing the costs of genotyping and implementation of genomic selection.

2017-01-01T00:00:00Z ACEVEDO, A. S. https://www.alice.cnptia.embrapa.br/alice/handle/doc/972937 2017-05-30T00:09:24Z 1976-01-01T00:00:00Z

Título: Produção, qualidade e persistência do capim de Rhodes (Chloris gayana Kunth), colhido em três estádios de crescimento e a duas alturas de corte. Autoria: ACEVEDO, A. S.

1976-01-01T00:00:00Z OLIVEIRA, J. C. P. https://www.alice.cnptia.embrapa.br/alice/handle/doc/888559 2017-08-15T22:56:01Z 2011-01-01T00:00:00Z

Título: Produção e qualidade de sementes de arroz (Oryza sativa l.) sob diferentes doses de fósforo aplicadas ao solo. Autoria: OLIVEIRA, J. C. P.

2011-01-01T00:00:00Z