Variability in protein, cell-wall constituents and in vitro dry matter and cell-wall digestibility of some promising cowpea strains (Vigna sinensis)
Randhir Singh; Gupta, P.C.; Pradhan, K.
Haryana Agricultural University Journal of Research 4(4): 309-313
Data concerning the chemical composition and digestibility in vitro of 18 cowpea strains are presented in order to encourage the breeding of varieties suitable for use as forage crops. The protein content at 50% flowering stage ranged from 12.6 to 16.2% of DM; neutral detergent fibre from 55.4 to 63.6%, cell-contents from 36.4 to 44.6%, acid detergent fibre from 38.6 to 50.0%, hemicellulose from 9.8 to 20.1%, cellulose from 23.7 to 35.1% and lignin from 8.9 to 13.2%. Digestibilities estimated by incubation for 48 h ranged from 55.7 to 70.3% for DM and from 25.6 to 50.2% for cell-wall constituents. Some simple correlations between protein content and other constituents were obtained, and 5 promising strains were considered to be nutritionally superior to the remainder. In 18 lines, protein content ranged from 12.64 to 16.19%; hemicellulose from 9.80 to 20.10%, cellulose from 23.70 to 35.10% and lignin from 8.90 to 13.20%. In vitro dry-matter and cell-wall digestibility varied from 55.70 to 70.30% and 25.58 to 50.17%, respectively. Lines HFC32,HFC42-1, HFC135, 10 and FOS1 were shown to be nutritionally superior.