DSpace Collection:https://repositorio.ufu.br/handle/123456789/192862026-09-23T21:12:59Z2026-09-23T21:12:59ZTeores sanguíneos de ureia e glicose como bioindicadores de eficiência alimentar em bovinos da raça nelore submetidos a diferentes dietashttps://repositorio.ufu.br/handle/123456789/503992026-09-23T17:57:34Z2026-03-17T00:00:00ZTitle: Teores sanguíneos de ureia e glicose como bioindicadores de eficiência alimentar em bovinos da raça nelore submetidos a diferentes dietas
Abstract: The present study aimed to evaluate the relationship between blood concentrations of urea and
glucose and feed efficiency, measured through residual feed intake (RFI), in Nellore cattle
subjected to feed efficiency trials under different dietary conditions. Two experiments were
conducted with different forage-to-concentrate ratios: Experiment 1 (n = 29), in which animals
were fed a diet containing 60% forage and 40% concentrate, and Experiment 2 (n = 24), with a
diet composed of 95% forage and 5% concentrate. Blood samples were collected at mid-test
and at the end of the trial, and the average of both periods was also considered. Statistical
analyses included Pearson correlation and analysis of variance (ANOVA). In Experiment 1, no
significant correlations were observed between RFI and urea or glucose (p > 0.05). In
Experiment 2, moderate and statistically significant negative correlations were observed
between RFI and urea at all evaluated time points, with r = –0.506 at mid-test, r = –0.460 at the
end, and r = –0.552 for the average, indicating that lower RFI values were associated with
higher blood urea concentrations. No significant association between glucose and RFI was
observed in either experiment. ANOVA did not identify a significant effect of RFI classes on
urea or glucose concentrations in both experiments (p > 0.05). It was concluded that blood
concentrations of urea and glucose were not consistent biomarkers of feed efficiency in Nellore
cattle, regardless of nutritional status, since no changes were observed even under different
dietary concentrate proportions. Further studies with a larger number of animals are
recommended to better understand their potential as biomarkers.2026-03-17T00:00:00ZEficiência de vazio sanitário em granja de suínoshttps://repositorio.ufu.br/handle/123456789/503572026-09-22T06:19:28Z2026-08-07T00:00:00ZTitle: Eficiência de vazio sanitário em granja de suínos2026-08-07T00:00:00ZDeterminação de fibra em detergente neutro e detergente ácido testadas simultaneamente em autoclave com diferentes alimentoshttps://repositorio.ufu.br/handle/123456789/503562026-09-22T06:19:28Z2026-08-06T00:00:00ZTitle: Determinação de fibra em detergente neutro e detergente ácido testadas simultaneamente em autoclave com diferentes alimentos2026-08-06T00:00:00ZEficiência de pastejo em pastagens diferidas de capim-cayana com estruturas contrastanteshttps://repositorio.ufu.br/handle/123456789/501802026-09-10T06:21:21Z2026-03-13T00:00:00ZTitle: Eficiência de pastejo em pastagens diferidas de capim-cayana com estruturas contrastantes
Abstract: The seasonality of forage production imposes challenges on maintaining animal productivity in pasture-based production systems. In this context, pasture deferment emerges as a management strategy capable of ensuring forage supply during the off-season, promoting biomass accumulation at the end of summer for use in winter. However, the structure of the pasture at the end of the deferment period directly influences grazing efficiency, that is, the utilization of deferred forage. Thus, the present study was conducted to quantify grazing efficiency in deferred pastures with Cayman grass (Brachiaria spp. cv. Cayana) with different forage masses. The experiment was carried out from 02/17/2025 to 09/17/2025, at the Capim Branco Experimental Farm of the Faculty of Veterinary Medicine and Animal Science at the Federal University of Uberlândia, in Uberlândia, MG. Grazing efficiency was evaluated based on the formula: GE (%) = 100% - P (%), in which GE refers to grazing efficiency is the loss of forage. The pasture with High MF showed a lower grazing efficiency value of 44%, while the pasture with Medium MF had a higher value of 53%. The pasture with Low MF, in turn, presented an intermediate grazing efficiency value of 47%; however, grazing efficiency was directly related to the structure of the forage, with the treatment containing a higher proportion of live leaves allowing for better forage utilization by the animals, resulting in higher grazing efficiency.2026-03-13T00:00:00Z