Rendimento e composição químico-bromatológica de fenos triturados de gramíneas tropicais

Abstract

RESUMO -A pesquisa foi conduzida objetivando avaliar o rendimento, a composição químico-bromatológica e as perdas de fenos triturados de milheto, sorgo sudanense, capim-elefante e sorgos forrageiros (SF-25 e IPA-467-4-2). Os materiais foram colhidos quando atingiram 30% de inflorescências, com exceção do capim-elefante, colhido aos 60 dias. Utilizou-se delineamento de blocos completos casualizados, com cinco tratamentos e quatro repetições. Houve diferenças significativas, com maiores produções de feno para os sorgos IPA-467-4-2 (10,85 t/ha/corte) e SF-25 (10,65 t/ha/corte), que foram superiores ao capim-elefante, sorgo sudanense e milheto, com, respectivamente, 6,94; 6,69 e 4,93 t/ha/corte. Os percentuais de perdas na fenação não diferiram entre os tratamentos, com níveis variando de 17,33 a 20,17%. Os fenos de milheto e sorgo sudanense tiveram as maiores concentrações de PB (10,56 e 8,80%), superiores às do capim-elefante (6,76%) e dos sorgos SF-25 (5,62%) e IPA-467-4-2 (5,50%). Os valores de FDN foram, na maioria, superiores a 70,0%. As menores concentrações de NIDN foram observadas nos cultivares de sorgo (0,42 e 0,40% da MS). As concentrações de NIDA variaram de 0,06 a 0,30% na MS. As maiores concentrações de lignina (%MS) dos fenos foram obtidas no milheto (6,52%) e no sorgo IPA-467-4-2 (6,17%). As concentrações de nutrientes digestíveis totais estimadas (NDT e ) dos fenos diferiram significativamente, com o maior valor para o sorgo sudanense (53,35%). Os fenos triturados das gramíneas tropicais avaliadas apresentaram rendimentos elevados e composição químico-bromatológica dentro dos padrões mínimos recomendáveis para nutrição de ruminantes.Palavras-chave: agricultura familiar, fenação, Pennisetum americanum, Pennisetum purpureum, Sorghum bicolor, Sorghum sudanense Yield and chemical composition of chopped tropical grass haysABSTRACT -The research was carried out to evaluate yield, chemical composition and losses of chopped tropical grass hays with the following forages: pearl millet (Pennisetum americanum), sudangrass (Sorghum sudanense), elephantgrass (Pennisetum purpureum) and two cultivars of forage sorghum (SF-25 and IPA-467-4-2) (Sorghum bicolor). The materials were harvested at 30% flowering, except for elephantgrass (60 days). The experiment was conducted according to a complete randomized block design, with five treatments and four replications. There were significant differences among hay productions with sorghum cultivars IPA-467-4-2 and SF-25 reaching the highest yields (10.85 and 10.65 t/ha/cut). Production of elephantgrass, sudangrass and pearl millet hays were respectively of 6.94, 6.69, and 4.93 t/ha/cut. Percentage of hay losses were not different among all treatments and varied from 17.33 to 20.17%. Pearl millet and sudangrass hays had the highest CP concentrations (10.56 and 8.80%), which were superior to elephantgrass (6.76%) and sorghum cultivars (5.62 and 5.50%). Most of the NDF values were superior to 70.0%. Sorghum cultivars exhibited the lowest NDIN concentration (0.42 and 0.40% of...

<b>Nutritional characteristics of sorghum hybrids hay (<i>sorghum sudanense</i> x <i>sorghum bicolor</i>)

“…And the lowest content was verified for hybrid 1014020, with 6.65% MM. Values close to those of sorghum-Sudan grass hay studied in this work were reported by Aguiar et al (2010), who studied hay of IPA-Bulk-1 millet, Sudan-4202 sorghum, Cameroon elephant grass, IPA-SF-25 forage sorghum and IPA-467-4-2 forage sorghum (10.53; 11.03; 10.98; 8.77 and 8.71% MM). Ash content indicates the amount of minerals in the forage, however high values may also be represented by quantities of silica, which is not favorable in ruminant feeding.…”

“…Aguiar et al (2010) structural carbohydrates and lignin contents and reduced cellular content, which invariably cause decline in digestibility. In this way, the higher IVDMD value may be related to the low age of hay of sorghum genotypes for cutting and grazing used in this study (52 days after planting, 45 and 49 regrowth days).…”

Nutritive value of diferents silage sorghum (Sorghum bicolor L. Moench) cultivares - doi: 10.4025/actascianimsci.v34i2.12853

“…Low CP rates for silages may have been caused by cultivar-inherent factors and by soil conditions in which the grass was cultivated. Aguiar et al (2006) Pereira et al (2007).…”

Use of conditioning in the production of black and white oat hay using two cutting heights

“…The quantification of CP associated with NDF and ADF (NDIP and ADIP) is important in the study of CP degradability of hay as well as the proportion of CP in relation to the total and the possible relationship of these components with the digestibility of nutrients and consumption of these forages (Aguiar et al, 2006). Likewise, the study of NDF components is critical, because the components of the NDF cannot be considered homogeneous nutritional entities (Van Soest, 1994), as well as CP, and if they are, they can lead to distortions in estimates of the apparently digestible fraction from the chemical composition of feeds produced in tropical conditions (Detman et al, 2008).…”