The effect of harvest date on the chemical composition, gross energy, organic matter digestibility, nutritive value and amino acid content of white lupin (Lupinus albus L.)
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Abstract
amino acid content of white lupin (Lupinus albus L.) during its growth cycle. Herbage samples were collected four times at progressive
morphological stages from the late bud to the young green pod stage. Two replications were performed at each stage and all data are mean
values of the triplicate analyses performed for each sample. The variability in the herbage quality characteristics were analysed for their
statistical significance via analysis of variance to test the effect of the growth stage. The dry matter (DM) and fibrous fractions increased
during maturation. No significant differences were found in organic matter (OM), ash and ether extract. The GE content ranged from 17.3 to
17.7 MJ/kg DM, while the crude protein, OMD and net energy for lactation declined with advancing maturity from 140 to 131 g/kg DM, from
693 to 615 g/kg OM and from 5.5 to 4.9 MJ/kg DM, respectively. The relative proportions of the individual amino acids (AA) and total AA
were unaffected by the harvest date. Aspartic and glutamic acid were the two most abudant AA in the plant during growth. White lupin forage
harvested at the flowering stage provides good quality forage for ruminants and could help improve the self-sufficiency of dairy farms, in
terms of home-grown protein forages. Further studies are necessary to determine the DM yield of the crop and the intake of this forage by
ruminants.
Key words: Lupinus albus, nutritive value, quality, forage, morphological stage
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