Changes in Total Glucosinolates Content of Chinese Cabbage Fodder with Maturity and its Impact on Rumen Fermentation

Different parts, (leaf, stem, flower and pods) of Chinese Cabbage during crop development were analysed for total glucosinolates, in vitro DM digestibility (TVDMD) and rumen fermentation products. The glucosinolates content varied significantly (P<0.01) among the parts and it was higher in leaves (12.33%). Followed by stem (8.75%), flowers (9.14%) and pods (7.09%). Trends were similar for IVDMD and total gas production. However, the variation (P<0.01) in IVDMD values was 20% units between best (leaves; 56.4%) and least (pods: 35.10%) digestible parts. Whereas, TVFA production was significantly (P<0.01) Sower in flowers (10 meq/1-SRL) and higher in leaves (70meq/l-SKL). Maturity of the crop reduced glucosinolate content and showed a negative correlation (R² = 0.81, P<0.01) between the parameters. Whereas, glucosinolates content had positive correlation (R²= 0.12, P<0.05) with TVFA production and negative correlation (R²=0.09) to total gas production.