Avaliação de clones de capim-elefante manejados sob lotação rotacionada. / Evaluation of clones of elephant grass managed under rotational stocking.

AUTOR(ES)

Afrânio Silva Madeiro

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

19/02/2010

RESUMO

This work aimed to describe and evaluate the morphogenetic and structural traits, and quality of two clones of elephant grass grazed under rotacional grazing. We used a completely randomized design with three replicates (paddocks) in a split plot, where clones were the whole plot and grazing cycles in a split plot, for evaluate morphogenetic and structural traits, and nutritive value. For evaluate nutrient intake was conducted a test using 10 heifers "testers" in a completely randomized design with 10 replications (animals). Characteristics and structural traits of tillers were similar between the clones. Leaf appearance rate and leaf elongation of aerial tillers were higher for the clone CNPGL 00-1-3 compared to clone CNPGL 92-198-7. Clones showed reduced elongation rate of stem, thus helping to increase the leaf/stem ratio, which is an indication of high nutritional value of pasture clones of elephant grass short stature. Variables studied basal and aerial tillers decreased with grazing cycle, which may be related to the lower temperatures recorded during May, June and July and the lowest rainfall that occurred during the same period. Chemical composition and in vitro digestibility of dry matter (IVDDM) were not affected (P>0.05) by clones and only DM, OM, MM, CP, ADF and CEL were influenced (P<0.05) by cycles of grazing, there wasnt interaction clone x cycle (P>0.05). Intake was not affected (P>0.05) by clones, however, high values were obtained of intake DM, which can be attributed to low values of NDF, ADF and LIG, and therefore to IVDMD. However, these results demonstrate high quality of forage clones CNPGL 00-1-3 and CNPGL CNPGL 92-198-7.

ASSUNTO(S)

consumo zootecnia nutritional value genótipos taxa de aparecimento de folhas valor nutritivo genotypes intake rate of leaf appearance

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