Divergência nutricional em genótipos de amendoim forrageiro (Arachis spp.)

Abstract

The experiment I was conducted at Embrapa Cerrados, Planaltina-DF, Brazil. The objective of this study was to evaluate the nutritional divergence of perennial peanut genotypes through the chemical characteristics, in vitro fermentation and degradation kinetics. The treatments consisted of ten accessions of Arachis spp.- six accessions of A. pintoi (Ap 20, Ap 8, Ap 31, Ap 19, Ap 65 and Ap 24) and the cultivar Belmonte, two accessions of A. repens (Ar 5 and Ar 26) and an interspecific hybrid (Ap x Ar) 9. Forage evaluations were made at a stubble height of 5 cm from the soil surface, with fixed cutting intervals of 42 days. The nutritional divergence was assessed using the canonical variables analysis. The variables with higher contribution to the discrimination of accessions were: rate of degradation of fraction B, crude protein and potential degradation in 48 hours. Four distinct groups were identified. Group IV, formed by the hybrid (Ap x Ar) 9, was the highest nutritional quality for ruminants. The experiment II was conducted at the Husbandry Station, located in Itabela city BA, Brazil. This study aimed to evaluate the nutritional divergence of ten forage peanut genotypes, based on chemical characteristics and in vitro fermentation and degradation kinetics. The treatments consisted of ten genotypes Arachis pintoi, constituting eight accessions (31135, 30333, 15121, 31,828, 15,598, 31,534, 13,251, and 31496) and two cultivars (cv. Belmonte and cv. Amarillo). The genotypes were harvested from each plot at a height of 3 cm from the soil at fixed intervals of 42 days, during the rainy season. The application of hierarchical cluster analysis, using average Euclidean distance matrix, allowed the establishment of five equal groups. Among these, 31828, 31534, 15121 and cv. Belmonte stood out nutritionally between the other genotypes, proving to be promising for use in ruminant feed.