| Abstrakt: |
To evaluate the protein nutrient of forage rapeseed, Brassica napus cv Huayouza 62 was studied based on FAO/WHO criteria model about essential amino acid (EAA). The essential amino acids for nutritional values were measured on Huayouza 62 protein at different growth periods. Results showed that rapeseed protein began to decrease gradually with the growth periods, but amino acids were rich in different stages. The content of essential amino acid in the flowering stage were Met + Cys (3. 36%), Phe + Tyr (10.11%) and Ile (5. 64%), Leu (9. 45%), Val (6.73%) in initial podding, which were higher than those of other growth periods of the total amino acids. In flowering and initial podding stages, ratio of total essential amino acids to total amino acids (TEAA/TAA) were 44. 88% and 44. 36% respectively. The ratio of total essential amino acids to total non essential amino acids were 0.81 and 0.80 respectively, which were higher than those of other periods. By the amino acid ratio coefficient method, the essential amino acid index in initial podding and podding stages were much higher than that of other periods. The score of ratio coefficient (SRC) of amino acid was up to 82 at the initial podding stage. According to the feed criteria for cattle, sheep and goat, all the essential amino acids index of Huayouza 62 was greater than 0.95. When combined with biological yield and forage palatability, it could be concluded that Huayouza 62 plants at flowering and initial podding stages could be developed as new feed for ruminant animals. [ABSTRACT FROM AUTHOR] |
