Changes in Anti-Nutritional Factors, Ruminal Degradability and in vitro Protein Digestibility of Gamma Irradiated Canola Meal

摘要

The aim of this study was to evaluate the effects of gamma irradiation (γ-irradiation) at doses of 15, 30 and 45 kGy on antinutritional factors, in vitro CP digestibility, ruminal Dry Matter (DM) and Crude Protein (CP) degradibility of Canola Meal (CM). Three ruminally fistulated Gezel rams were used to measure ruminal in situ Dry Matter (DM) and CP degradability. The chemical composition of raw and irradiated CM was similar. Results showed that phytic acid in γ-irradiated CM at dose of 15, 30 and 45 kGy γ-irradiated CS decreased (p<0.01) by 26.2, 51 and 56.7%, respectively. Total glucosinolate contents of 15, 30 and 45 kGy γ-irradiated CM was decreased (p<0.01) 26.3, 51 and 63.4%, respectively. From in sacco results, γ-irradiation decreased (p<0.05) the washout fractions of CP at doses of 30 and 45 kGy. Gamma irradiation also reduced (p<0.05) degradation rate of the b fraction of CP so at doses of 30 and 45 kGy, Effective Degradibility (ED) of CP (rumen outflow rate of 0.05 h-1) were decreased by 8.2 and 21.0%, Compared to untreated sample. On the contrary digestibility of ruminally undegraded CP of irradiated CM at doses of 30 and 45 kGy was improved (p<0.05) by 10.6 and 15.5%.