Effect of mare body condition on passive immunity transfer and morphometric evaluation of Mangalarga Marchador foals from birth to weaning Isadora Leite e Lopes, Lívia Vieira de Barros, Letícia Ferrari Crocomo, Felipe Gomes da Silva, Daniel Ananias de Assis Pires, et al. Semina Ciencias Agrarias, 2026 O presente estudo foi conduzido como objetivo identificar se o escore de condição corporal (ECC), peso e idade da égua e o sexo do potro influenciam na transferência de imunidade passiva e no desempenho produtivo dos potros do nascimento ao desmame. O experimento foi realizado em haras comercial, localizado no Norte de Minas Gerais. Foram utilizadas 34 éguas da raça Mangalarga Marchador e seus respectivos potros. O delineamento experimental foi inteiramente casualizado. As éguas foram acompanhadas no dia do parto como objetivo de acompanhar o nascimento dos potros, verificar a ingestão e qualidade do colostro além de realizar a avaliação do peso com a utilização de fita métrica e parâmetros fisiológicos no recém-nascido. A transferência passiva de imunidade da mãe para os potros foi analisada por meio do teste rápido “IgG Check”. Os potros foram avaliados mensalmente durante os cinco primeiros meses de vida quanto ao peso e medidas morfométricas. Os dados foram submetidos a ANOVA e as médias comparadas pelo teste F ou a análise de regressão e ajustados aos modelos linear e quadrático (P<0,05). Todas as análises foram realizadas utilizando o software SAS ao nível de 5 % de probabilidade. Não houve efeito (P≥0,05) dos parâmetros avaliados sobre a transferência de imunidade passiva e parâmetros fisiológicos dos potros ao nascimento. Houve efeito (P<0,05) do ECC da égua sobre a altura de cernelha e comprimento da garupa ao nascimento dos potros. O ECC das éguas não influenciou (P≥0,05) as medidas morfométricas dos potros ao desmame. O sexo dos potros influenciou na altura da cernelha, comprimento da espádua e comprimento da garupa do potro ao desmame. Conclui-se que os fatores avaliados não influenciaram a transferência de imunidade passiva, no entanto, o sexo do potro e a condição corporal das éguas influenciaram no crescimento dos potros até o 5° mês de idade.
Effects of banana residue hay on performance and ingestive behavior of sheep L.C. Geraseev, L.H. Assunção, E.R. Duarte, I.F. Furusho-Garcia, L.V. Barros, et al. Arquivo Brasileiro De Medicina Veterinaria E Zootecnia, 2025 The objective of this study was to evaluate the effects of including banana leaf and pseudostem hay, subjected to different drying methods, on the performance and ingestive behavior of sheep. Twenty Santa Inês x Dorper lambs were used and distributed into five diets: Tifton 85 grass hay, shade-dried banana leaf hay, shade-dried pseudostem banana hay, sun-dried banana leaf hay and sun-dried banana pseudostem hay. The inclusion of banana residues reduced the dry matter intake, with the lowest intake observed in animals fed shade-dried leaf hay (67.3g/kg LW0.75/day). Despite the lower dry matter intake (82.9g/kg LW0.75/day), animals fed pseudostem hay had similar weight gain to those on Tifton 85 grass hay (122.8g/day). The leaf hay resulted in longer chewing time (881.4min/day), rumination time (591.4min/day) and ruminal bolus chews (60.5/bolus), likely due to its higher lignin content. Leaf hay reduces animal performance and is not recommended for sheep confinement, whereas pseudostem hay promotes similar performance to Tifton hay is a viable alternative roughage. Sun drying improved ingestive behavior and offered processing advantages.
Sorghum Densification with Changes in Plant Spacing Arrangement: Productivity and Qualitative Characteristics of Silage Material Dayenne M. Herrera, Wender M. Peixoto, Joadil G. de Abreu, Rafael H. P. dos Reis, Carlos E. A. Cabral, et al. Agronomy, 2024 The aim of this study was to evaluate the agronomic performance of sorghum grown in different combinations of row spacing and plant density, as well as possible interferences on silage quality. No other study dedicated to identifying the interference of plant spatial arrangement on the cultivation of silage material has been developed in the productive context of the Amazon Biome, making it necessary to understand the behavior of the studied factors. The treatments were arranged in a split-plot scheme: the plots corresponded to three row spacings (0.45 m, 0.60 m, and 0.75 m) and subplots at four densities (105,000, 120,000, 135,000, and 150,000 plants ha−1). The agronomic and productivity characteristics of sorghum and the fermentative and bromatological characteristics of forage and silage were evaluated. The sorghum plants showed an increase in plant height and green and dry mass yield when using higher densities (p < 0.05). For the culm diameter variable, an isolated effect of the factors was observed, with reduced diameter when grown closer to inter-row spacing or using higher plant densities. No effect of the factors was found (p > 0.05) for morphological plant components. In silage, wider spacing promoted higher dry matter content. Regarding crude protein in the silage, higher percentages were obtained at closer spacing and higher plant density. The sorghum growing in dense conditions is indicated, given the positive performance in productivity and bromatological composition.
Silvopastoral system with high-density of trees accelerates degradation of tropical grass Alyce Monteiro, Fagner Junior Gomes, Lucas Gimenes Mota, Luiz Jardel Müller Motta, Lívia Vieira de Barros, et al. Revista Brasileira De Saude E Producao Animal, 2024 Tree density is an important aspect in silvopastoral system (SPS) planning, since low luminosity can limit forage perenniality, especially for tropical forages of C4 metabolism. The objective with this study was to verify if an SPS with high tree density accelerates the pasture degradation process and changes the forage chemical composition. The experiment was carried out by comparison of marandu palisade grass [Urochloa brizantha (Hochst. ex A. Rich.) R. D. Webster] pasture in two systems: silvopastoral and open pasture. In the SPS, teak (Tectona grandis) was planted with a density of 750 trees ha-1. Evaluations were carried out over three years (2015, 2016 and 2017). SPS shading reduced herbage mass, tiller density and soil cover over the years. In the marandu palisade grass in the SPS there was a greater stem proportion, which favoured lesser potential digestible dry matter in the first year. Even with a higher amount of stem, higher crude protein concentration and minerals were observed in the SPS. Due to the high density of trees, excessive shading accelerated the process of degradation of the pasture, which demonstrates that planning of the spatial arrangement of tree species is crucial.
Pre-defoliation canopy height for signal grass 'Basilisk' in silvopastoral systems Victor Augustus Vasconcelos de Oliveira, Rafael Bolina da Silva, Anielede Cássia Rodrigues Veloso, Matheus Almeida Alves, Marinalva Martins dos Santos, et al. Semina Ciencias Agrarias, 2024 The objective of this study was to compare the response of Urochloa decumbens cv. Basilisk pastures in monoculture and silvopastoral systems (SPS), and to determine the most suitable pre-defoliation canopy height for managing this species in SPS. Four pre-defoliation canopy heights (20, 30, 40, and 50 cm) were tested for signal grass in SPS, alongside a control treatment involving defoliation at 20 cm in full sun. The experiment was conducted using a randomized block design with four replicates. The forage accumulation rate was higher in monoculture (36.5 kg ha-1 day-1 of DM) compared to the silvopastoral system (22.0 kg ha-1 day-1 of DM), and there was no significant effect of pre-defoliation canopy height within the SPS. The density of tillers in monoculture was comparable to that observed in canopies managed at a height of 50 cm within the SPS. Leaf mass and leaf percentage were maximized at heights of 40 cm and 50 cm, respectively. Neither the cultivation system nor the pre-defoliation canopy heights in the SPS influenced the fiber and protein content. Leaf accumulation and mass were higher in monoculture, but the cultivation system did not affect the chemical composition of the forage. Heights between 40 cm and 50 cm in the SPS should be used to maximize tillering, mass, and leaf percentage of signal grass ‘Basilisk’. The chemical composition of the produced forage did not undergo significant changes, neither between systems nor across pre-defoliation heights.
Energy supplementation as strategy of pasture management Alyce Raiana Monteiro Santos, Carla Heloísa Avelino Cabral, Carlos Eduardo Avelino Cabral, Livia Vieira de Barros, Deborah França Pires, et al. Acta Scientiarum Animal Sciences, 2022 This study evaluated the effect of increased energy via supplementation on the performance, ingestive behavior, nutrient digestibility, and nitrogen metabolism of grazing heifers fed tropical forage in the rainy-dry transition season. Treatments consisted of mineral supplementation ad libitum (control) and multiple supplements formulated to provide different energy levels and the same amount of protein (300 g CP animal d-1) and were denominated as low (LE; 340 g TDN animal d-1), medium (ME; 780 g TDN animal d-1) and high (HE; 1220 g TDN animal d-1) energy. Animals supplemented with ME, and HE had a greater average daily gain in relation to the control treatment, with an increase of 41 and 46%, respectively. Greater values for total apparent digestibility of neutral detergent fiber were observed for the treatment HE. Lesser values of urinary urea N were observed for the control and HE treatments. Our results define the use of energy levels in the supplement as a tool for pasture management. If the purpose of the production system is to enhance forage intake, the option is to supply supplements with less energy levels. In contrast, if the purpose is to increase the stocking rate, supplements with greater energy levels should be used.
Cultivation of ruziziensis grass (Urochloa ruziziensis) using swine liquid manure fertilization Marinho Rocho da Silva, Joadil Gonçalves Abreu, Oscarlina Lucia dos Santos Weber, Livia Vieira de Barros, Edna Maria Bonfim- Silva, et al. Australian Journal of Crop Science, 2021 The objective of this study was to evaluate the use of liquid swine manure (LSM) as fertilization in the implantation of Urochloa ruziziensis. The experimental design was randomized blocks with five treatments and four replications, with the treatments being four doses of LSM (0; 100; 200 and 300 m3 ha-1) and one dose of mineral fertilization. Seven cuts were carried out uniformly, after which plant height (PH), total dry mass yield (TDMY), crude protein content (CP), neutral detergent fiber (NDF) and acid detergent fiber (ADF), macromineral extraction (N, P, K, Ca, Mg and S) and microminerals (Fe, Zn, Mn and Cu) of plants were evaluated every 30 days. Mineral fertilization provided higher PH, CP content and extraction of N and S, but lower NDF content. For ADF variable, there was no difference between treatments. The results of dry mass yield (DMY) and extractions of P, K, Ca and Mn showed that the effect of 300 m3 ha-1 LSM was statistically equal to mineral fertilization. For extractions of Mg, Fe, Zn and Cu doses of 200 and 300 m3 ha-1 did not differ statistically from mineral fertilization. Among the doses of LSM, there was increasing linear effect, with increases in the variables DMY (30.89%), PH (14.94%), CP (17%), N (53.01%), P (40.79%), K (27.84%), Ca (35.17%), Mg (29.6%), S (47.13%), Fe (31.2%), Zn (31.6%) and Mn (23.04%). For Cu extraction, there was a quadratic effect with the highest extraction in the dose of 26.36 m3, obtaining an increase of 19.94% in relation to treatment without application. It is important to study different LSM dosages to avoid risk of heavy metal toxicity. The LSM is an alternative in place of mineral fertilization for Urochloa ruziziensis grass.
Influence of energy supplementation on associative effects in Nellore bulls on a tropical pasture during the rainy season Mariane Stahlhofer, Ériton Egidio Lisboa Valente, Lívia Vieira de Barros, Matheus Leonardi Damasceno, Mariana Barbizan, et al. Semina Ciencias Agrarias, 2021 The objective of this study was to evaluate the influence of energy supplementation on associative effects between forage and concentrate supplements and on the performance of beef cattle on a tropical pasture during the rainy season. Twenty-eight Nellore bulls averaging 19 months of age and 325.2 ± 4.1 kg were allotted to a completely randomized design and distributed into four paddocks of two hectares each with a tropical pasture for 84 d. The treatments consisted of bulls on Urochloa brizantha cv. Xaraés pasture without concentrate supplementation or bulls on Urochloa brizantha cv. Xaraés pasture receiving concentrate supplementation at 15 (S15), 30 (S30) or 45% (S45) of the total digestible nutrients (TDN) requirement All bulls had ad libitum access to mineral supplementation. The amount and chemical composition of the supplement were adjusted every 28 d. Forage and supplement intakes were evaluated in all animals using fecal markers. Crude protein: digestible organic matter ratio decreased with supplementation; consequently, the imbalance between dietary protein and energy increased. Forage intake decreased with increasing supplementation. The substitution rates of pasture for supplementary feed were 0.14, 0.33, and 0.46 for bulls from S15, S30, and S45 treatments, respectively. However, the apparent DM digestibility increased linearly with supplementation level. Supplementation improved the assimilation of ammonia-N in the rumen. Energy supplementation for Nellore bulls on tropical pastures during the rainy season provides excess energy relative to protein, resulting in a substitution effect of supplement intake on forage intake. Moreover, energy supplementation does not improve body weight gain. Protein sources should be added to supplements for balancing protein and energy levels, thereby reducing a likely substitution effect.
Ensiling of elephant grass with soybean hulls or rice bran India Joelma Gatass Monteiro, Joadil Gonçalves de Abreu, Luciano Da Silva Cabral, Roberto Giolo de Almeida, Rafael Henrique Pereira dos Reis, et al. Semina Ciencias Agrarias, 2016
Levels of supplementation for grazing beef heifers Carla Heloisa Avelino Cabral, Mario Fonseca Paulino, Edenio Detmann, Sebastião de Campos Valadares Filho, Lívia Vieira de Barros, et al. Asian Australasian Journal of Animal Sciences, 2014
Low intake supplement for non-pregnant beef cows Nelcino Francisco de Paula, Mário Fonseca Paulino, Victor Rezende Moreira Couto, Edenio Detmann, Ivan França Smith Maciel, et al. Semina Ciencias Agrarias, 2014
Protein requirements of pasture supplemented beef cattle Maykel Franklin Lima Sales, Mário Fonseca Paulino, Sebastião de Campos Valadares Filho, Mario Luiz Chizzotti, Lívia Vieira de Barros, et al. Revista Brasileira De Zootecnia, 2010
