Valores energéticos e coeficientes de metabolizabilidade de grãos de milho com diferentes densidades específicas
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Data
2023-04-25
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Universidade Federal de Goiás
Resumo
The aim of this study was to examine the influence of the specific gravity of maize kernels on physicochemical traits, energy
values, and metabolizability coefficients. Pearson’s correlations were evaluated between specific gravity (kg/m³) and crude
protein (%); ether extract (%); crude fiber (%); gross energy (%); presence of fumonisins (ppb) and aflatoxins (ppb); and
kernel quality (good, rotten, weevil-damaged, broken, and shriveled kernels, %). A metabolism trial was conducted with
diets containing maize fractions of different specific gravities for male broilers from 14 to 21 days of age. Apparent
metabolizable energy (AME), nitrogen-corrected AME (AMEn), and the metabolizability coefficients of dry matter
(MCDM), crude protein (MCCP), ether extract (MCEE), calcium (MCCa), and phosphorus (MCP
) were evaluated. The
experiment consisted of five treatments (reference diet and diets with 40% replaced with maize at five specific gravities
(740, 740, 760, or 800 kg/m³). Eight replications were used, totaling 400 broilers chickens. The Scott-Knott test was applied
and regression equations were fitted to compare the treatments. Specific gravity had moderate correlations with good and
broken kernels and low-magnitude correlations with chemical parameters. Increasing specific gravities caused AME and
AMEn to increase linearly when analyzed on an as-is basis; and to respond quadratically when expressed on a dry-matter
basis. The specific gravity of 780 kg/m³ provided the lowest MCDM, MCCP, MCCa, and MCP
values, whereas the lowest MCEE,
was found at the lowest density. It was not possible to determine the best nutritional composition or the best metabolizability
coefficients.
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Análise bromatológica, Correlação, Energia metabolizável aparente, Regressão, Apparent metabolizable energy, Chemical analysis, Correlation, Regression
Citação
BATISTA, Lucas Ferreira et al. Valores energéticos e coeficientes de metabolizabilidade de grãos de milho com diferentes densidades específicas. Ciência Animal Brasileira, Goiânia, v. 24, e-74343P, 2023. DOI: 10.1590/1809-6891v24e-74343P. Disponível em: https://revistas.ufg.br/vet/article/view/74343/39699. Acesso: em 26 dez. 2023.