The nutritive value of new high-lysine barley mutants
1995
Eggum, B.O. | Brunsgaard, G. | Jensen, J.
Four new high-lysine barley mutants, the mother variety 'Sultan', and the cultivar 'Lysimax' with the high-lysine gene lys3a were grown in a field trial in 1992 at Riso, Denmark. Yield and 1000 kernel weights were measured. The material was analyzed for protein, fat, starch, soluble non-starch polysaccharides, insoluble non-starch polysaccharides, lignin, beta-glucans, sugars, energy and amino acids. The nutritive value was evaluated in balance experiments with rats. The mutants yielded less than the mother cultivar 'Sultan' in the range 80-96%. Thousand kernel weights were also lower than for the mother cultivar. The protein concentration was higher in the mutants, with the highest value of 14.2% vs 12.9 in 'Sultan'. The fat content was usually higher in the mutants, with the highest value of 5.3% vs 3.9% for 'Sultan'. The starch content varied considerably, from 51.2%-60.3% for the mutants, while 'Sultan' contained 58.2%. The level of dietary fibre was usually higher in the mutants compared to the level in 'Sultan' (19.7%). Beta-glucan and sugar contents varied among the mutants, with values higher and lower than in 'Sultan'. 'Sultan' contained 3.31 g lysine/16 g N vs 4.73 g N in one of the mutants. The higher lysine content resulted in an 11.6% unit increase (P<0.05) in biological value (77.6% for 'Sultan' vs 88.2% for this mutant). The protein digestibility was usually higher (P<0.05) in 'Sultan' (87.1%). Energy digestibility was slightly lower (P<0.05) in the mutants compared to the value for 'Sultan' (84.1%).
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