Abstract
AbstractIn five separate experiments, three high‐lysine (HL) barley lines were compared with the HL mutant Risø 1508 and the normal variety Maris Mink (MM), for their lysine content, protein quality and metabolisable energy (ME). The HL barley lines were selected from crosses between Risø 1508 and Julia or Lofa Abed. Lysine content (g/16 g N) as measured by four different procedures was found to be from 11 to 28% higher in the HL barleys compared to MM. True nitrogen and lysine digestibility were only slightly reduced (6 and 4%, respectively) in the HL barleys when they were fed as the sole N source in purified diets for rats in an N‐balance trial. A subsequent 17% improvement in protein retention efficiency (PRE) was noted in the rat trials when the HL barleys provided the N source rather than MM. Further supplementation with lysine did not improve PRE values for the HL barleys though a significant response was noted with MM samples. Although the gross energy content of all the barleys was similar, the ME values of the HL barleys were some 8‐15% lower than the corresponding values for MM. The reasons for this and the potential economic value of these HL barleys are discussed.
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