Abstract
Ca 700202 is a cultivar produced from Risø 1508 in a high-lysine barley breeding program at the Carlsberg Research Center, Copenhagen DK. Two crops of normal (Bomi and Triumph) and high-lysine (Risø 1508 and Ca 700202) barleys were evaluated in two growth and nitrogen balance studies with rats. Barleys were formulated into isonitrogenous, isocaloric diets and fed to 10 weanling male rats in a 21-d growth study and five similar rats in a 9-d nitrogen balance. Average lysine content of Ca 700202 and Risø 1508 (g 16 g−1N) were 47.1 and 40.2% higher, respectively, than the average of the normal barleys. Rats fed Ca 700202 and Risø 1508 consumed more (P < 0.0001) feed than those fed the normal barleys. Final body weights, 21-d gains, feed per unit gain (F:G) and protein efficiency ratio (PER) were superior (P < 0.0001) for rats fed high-lysine compared to the normal barleys. Normal barleys had more digestible protein than high lysine barleys (P < 0.01). Biological value (BV) of Ca 700202 protein was 99.2% compared to 95.9% for Risø 1508 in trial I and 88.2% compared to 85.6% in Trial II which were higher (P < 0.01) than the BV of the protein for normal barley. Net protein utilization (NPU) of rats fed the high-lysine barley was 9% higher (P < 0.01) than the NPU of rats fed the normal barleys. The Ca 700202 barley cultivar yielded 91% of reference barleys but produced a 27% increase in lysine yield per plot. Key words: Protein, amino acids, Hordeum vulgare L., rats, barley
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