Valor nutricional do colmo de gramíneas tropicais

Abstract

The objective of this work was to evaluate the nutritional value and in vitro organic matter digestibility of stem of genotypes of Cynodon in four regrowth ages (28, 48, 63 and 79 days) in the period of autumn-winter transition. The treatments were distributed following a randomized block design, with treatments arranged in a split plot, being the genotypes studied (Tifton 68, Tifton 85, Russell, Jiggs and Vaquero) the plots, and the four ages cutting the subplots (28, 48, 63 and 79 days). The crude protein values of the stem of the analyzed genotypes daily decreased 1.36% and were higher at 28 days of age (11.22%). Fiber content of acid detergent of all genotypes increased with age, and largest daily increases were observed in Tifton 68 (1.91%) and Vaquero (1.55%) genotypes compared to the others. The highest values of total digestible nutrients and in vitro digestibility of organic matter were verified at the age of 28 days (50.40% and 72.50%, respectively) and with the advancement of plant age reductions of 2.52% and 0.71% were observed. The cutting management and/or grazing of all genotypes at the age of 28 days of regrowth have better nutritional value and in vitro digestibility of organic matter compared to other ages. Normal 0 21 false false false PT-BR X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabela normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin-top:0cm; mso-para-margin-right:0cm; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi; mso-fareast-language:EN-US;}