Abstract
The objective of this research was to select elephantgrass clones for grazing conditions. A randomized complete block design was used, with 16 treatments and four replications. Each plot had a total area of 25m2, with the presence of animals. The following parameters were determined: leaf blade accumulation rate (LBAR) above 40cm height and total, stem accumulation rate (SAR), total forage accumulation rate (TFAR), dry matter concentration (%DM), crude protein concentration (%CP) and, neutral detergent fiber (%NDF). The results showed significant difference (P<0.05) between clones and evaluation periods for LBAR above 40cm, total LBAR and TFAR, with mean values of 28.08, 41.62 and 49.18kg/ha/day, respectively. Crude protein and NDF differences (P<0.05) were also found between the clones for all the different parts of the analyzed plant. The forage lost presented a similar chemical composition to the leaf blades above 40cm and to the post-grazing residue. The clones CE-08-AD and Venezuela AD presented a high performance considering the evaluated parameters and may be considered as promising materials.
Highlights
A mesorregião Zona da Mata Pernambucana apresenta condições edafo-climáticas favoráveis ao desenvolvimento da pecuária paralelamente à exploração da cana-de-açúcar, podendo contribuir no processo de diversificação agropecuária daquela região (Lira et al, 2000)
Para os teores de PB nas perdas de forragem houve diferença (p
Os valores de PB observados nessa fração da forragem podem ser considerados elevados, tendo obtido valor médio para os clones de 13,91%
Summary
O experimento foi realizado na Estação Experimental de Itambé, Estado de Pernambuco, pertencente à Empresa Pernambucana de Pesquisa Agropecuária (IPA), município de Itambé, Zona da Mata Seca do Estado (07o25’00”S, 35o06’00” SWGr. e altitude de 190m). A precipitação pluviométrica anual fica em torno de 1300mm, porém 70% desse total ocorre nos meses de março a julho e a temperatura média anual é de 25,1°C (Encarnação, 1980). Os dados climatológicos referentes à temperatura média e precipitação pluviométrica, nos anos de 1998 e 1999, até junho de 2000, foram, respectivamente, 28,3oC e 697mm; 27,6oC e 723,6mm e 27,6oC e 1.071mm (Tabela 1). Foram utilizados clones de capim-elefante e um híbrido hexaplóide de capim-elefante com o milheto, totalizando genótipos. Temperaturas e precipitações pluviométricas médias, referentes aos anos de 1998, 1999 e 2000, observadas na Estação Experimental de Itambé, Estado de Pernambuco
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