Variabilidade e herdabilidade de caracteres qualitativos relacionados à qualidade de forragem de clones de capim-elefante na Zona da Mata de Pernambuco

Abstract

The objective of this research was to evaluate variability and heritability of quantitative traits related to forage quality of 32 clones of elephant grass (three local controls, from Zona da Mata de Pernambuco, and the remaining from RENACE/CNPGL). A complete randomized design was used with additional controls and analyses of variance was applied by using the procedure of families with controls between rows. Evaluation was performed during the dry period, at 60 days of growth. It was observed significant differences among clones for the traits acid detergent of leaf blade and stem organic matter, with means of 34.05 and 78.83%, respectively. In general, heritability of qualitative traits was low, including null values for crude protein and neutral detergent fiber of leaf blade and in vitro digestibility of dry matter of leaf blade and stem. Chemical composition and digestibility of evaluated clones were similar. There are few possibilities of gain in selection for qualitative traits considering the low variability and heritability of the studied characters. © 2011 Sociedade Brasileira de Zootecnia.