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      Efecto de la época de corte sobre la composición química y degradabilidad ruminal del pasto Dichanthium aristatum (Angleton) Translated title: Effect of period of regrowth on chemical composition and ruminal degradability from forage Dichanthium aristatum (Angleton)


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          En el presente trabajo se evaluó la composición química del pasto Dichanthium aristatum (Angleton), a diferentes edades de corte (21, 28, 35, 42 y 49 días) y su degradabilidad “In situ” a diferentes tiempos de incubación (0,12, 24,36, 48 y 72 horas). Los resultados del análisis químico denotaron diferencias altamente significativas en el contenido de proteína bruta (PB), a los 21 días con un descenso a medida que aumentó la edad de corte; el mayor valor alcanzado fue de 13, 6. Los niveles de materia seca, lignina, materia orgánica, Fibra Neutro Detergente (FDN), Fibra Ácido Detergente (FDA), y ceniza no registraron diferencias significativas. Los datos de degradabilidad ruminal se sometieron a un análisis de varianza a través del procedimiento de modelos lineales generales, GML de SAS® 8.1 y la comparación de medias se hizo a través de la prueba de Tukey; observándose que existe diferencias significativas entre las edades de corte de 21 y 28 días con respecto a las demás, en los parámetros de MS, FDA y FDN; mientras que la degradabilidad de PB, fue significativamente diferente en la edad de corte de 21 días con respecto a las otras. Este dato sugiere que a medida que la planta envejeció se hizo menos degradable. De acuerdo a los resultados obtenidos, basados en el análisis químico y la degradabilidad ruminal se deduce que a 21 días de corte, la pastura posee mayor valor nutritivo teniendo en cuenta que su calidad está fundamentada en el contenido de proteína y la asimilación de la fibra.

          Translated abstract

          In the present work, the chemical composition of the grass Dichanthium aristatum (Angleton) to different period of regrowth (21, 28, 35, 42 and 49 days) and its degradation “In situ” to different times from incubation (0.12, 24.36, 48 and 72 hours) was evaluated. The results of the chemical analysis highly denoted significant differences in the percentage of crude protein to the 21 days with a reduction as it increased the of period of regrowth; the greater reached value was of 13, 6%. The levels of dry matter, lignin, organic matter, FDN, FDA and ash did not register significant differences. The dates of ruminal degradation were submitted to the variance analysis through the General Model Lineal (GML) process of SAS® 8.1 and the comparison of medias were done by means of Tukey probe. Significant differences in the MS, FDA and FDN parameters, between ages of regrowth from 21 and 28 days with respect to the others were observed; while degradation of PB was different significantly in the age of regrowth of 21 days with respect to the anothers. These dates suggest that as the plant aged became less degradable.According to the obtained results, based on the chemical analysis and the ruminal degradation it is deduced that to 21 days of its regrowth, the pasture owns a higher nutritious value considering that its quality is based on the protein content and fiber assimilation.

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          Evaluation of the importance of the digestibility of neutral detergent fiber from forage: effects on dry matter intake and milk yield of dairy cows.

          M Oba, M Allen (1999)
          Effects of the digestibility of neutral detergent fiber (NDF) from forage on performance of dairy cows were evaluated statistically using treatment means for 13 sets of forage comparisons reported in the literature. All comparisons reported significant differences in NDF digestibilities of forages in situ or in vitro. Treatment means were blocked by study or by additional factorial treatment within a study to remove variation among experiments. The statistical model included random effect of block, fixed factorial effect of NDF digestibility (high or low), and dietary NDF concentration as a covariate. Enhanced NDF digestibility of forage significantly increased dry matter intake (DMI) and milk yield. A one-unit increase in NDF digestibility in vitro or in situ was associated with a 0.17-kg increase in DMI and a 0.25-kg increase in 4% fat-corrected milk. Differences in NDF digestibility between treatments were greater when measured in vitro or in situ than when measured in vivo. Digestibility of NDF in vitro or in situ might be a better indicator of DMI than NDF digestibility in vivo because forages with high in vitro or in situ NDF digestibilities might have shorter rumen retention times, allowing greater DMI at the expense of NDF digestibility in vivo. Digestibility of NDF is an important parameter of forage quality.
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            Oficial Methods of Analisis

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              Official methods of analysis


                Author and article information

                Zootecnia Tropical
                Zootecnia Trop.
                Instituto Nacional de Investigaciones Agricolas INIA, Maracay, Venezuela. (Maracay, Aragua, Venezuela )
                June 2010
                : 28
                : 2
                : 275-282
                [01] Montería Córdoba orgnameGRUBIODEQ orgdiv1Grupo de Biotecnología orgdiv2Departamento de Química Colombia clara@ 123456sinu.unicordoba.edu.co
                S0798-72692010000200013 S0798-7269(10)02800213


                : 12 February 2009
                : 07 October 2010
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 22, Pages: 8

                SciELO Venezuela

                Artículos Científicos

                Dichanthium aristatum (Angleton),period of regrowth,degradabilidad ruminal,época de corte,Dichanthium aristatum (Angleton),,ruminal degradation


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