Abstract: The purpose of this study is to investigate the possibilities of calculating Effective Degradability of Dry Matter (EDDM), organic matter (EDO) and crude protein (EDP) by means of the shortest ruminal incubation time. After calculating EDP, EDO and EDDM using 4-72 h ruminal incubation time, the relationship between them and degradability of Dry Matter (DMD), Organic Matter (OMD) and Crude Protein (CPD) measured at 4, 8, 16, 24, 48 and 72 h was investigated by applying simple linear regression analysis. The determination coefficient indicated that 93.9 of variation in EDP for 0.02 h-1 can be adequately explained by CPD measured at the end of 48 h of ruminal incubation (p<0.01). The results indicated that EDP for outflow rate of 0.05 and 0.08 h-1 would be estimated from the CPD measured at 8 h. Moreover, the calculated determination coefficients were 91.7 and 94.6% for outflow rates of 0.05 and 0.08 h-1, respectively, which confirmed that EDO can accurately be calculated by means of the 8th h measurements of OMD (p<0.01). The results also shown that 90% of variation in EDDM, which is a satisfactory amount, can be elucidated by the DMD measurements of 16th h, which states that EDDM for the outflow rate of 0.02 h-1 can be estimated from the DMD measurements taken at the end of 16 h (p<0.01). The determination coefficients were calculated as 92.7 and 97.9% for outflow rates of 0.05 and 0.08 h-1, respectively, indicating that EDDM for 0.05 and 0.08 h-1 would be predicted from the DMD measured at the end of 8 h incubation time.
Aydan Yilmaz, Zahide Kocabas, Elif Ozturk and Dilek Gokceyrek, 2009. An Investigation on the Shortest Ruminal Incubation Time in Calculating Effective Rumen Degradability of Nutrients in Solvent Extracted Sunflower Seed Meal. Journal of Animal and Veterinary Advances, 8: 2546-2552.