Comparative Evaluation of Cotton Seed Cake and Leucaena Leaf Meal on Profiles of Amino Acids, tannins And Their Influence on Digestion Kinetics

Cotton seed cake and Leucaena leaf meal were evaluated for chemical composition, profiles of amino acids and tannins, degradation kinetics and gas production. Cotton seed cake and Leucaena leaf meal both contained high levels of crude protein (22.75; 24.68% DM) and moderate level of NFE (38.38; 46.22%DM). Crude fiber content was however, higher in cotton seed cake than in Leucaena leaf meal. Methionine+cysteine content (g/100g protein) of Leucaena leaf meal was higher than that of cotton seed cake (6.47; 5.57) even higher than that of whole egg protein (6.47; 5.70). However, lysine content was moderate in cotton seed cake and low in Leucaena leaf meal (1.90; 0.58). Other essential amino acids were present in good proportion except arginine in both the ingredients and histidine and tyrosine in Leucaena leaf meal. Leucaena leaf meal contained higher (P<0.05) level of total phenols and total tannin than that of cotton seed cake (5.12±0.17 0.94±0.05; 2.83±0.15 0.59±0.05% DM). Hydrolysable and condensed tannin contents of Leucaena leaf meal was higher (P<0.05) than that of cotton seed cake IVDMD and IVOMD values of cotton seed cake (53.76±1 50; 52 97±1.19%) were non significantly different from those of Leucaena leaf meal (50 73±1 53; 52.78±2 03%) However IVCPD value of Leucaena leaf meal was significantly (P<0 05) higher than that of cotton seed cake (76 67±0.88; 64 94±1.24% DM) Total in vitro gas production (ml/g substrate) and it's rate of production (ml/h/g substrate) differ non significantly between cotton seed cake and Leucaena leaf meal during the first stage kinetic (0-24h) but increased (P<0 05) in the second stage kinetic in cotton seed cake Potential degradability of cotton seed cake was higher than that of Leucaena leaf meal but effective degradability of both DM and OM was higher in Leucaena leaf meal while effective and potential degradability of CP was higher in cotton seed cake. However, UDP content was higher in Leucaena leaf meal than that of cotton seed cake (144.62 vis a vis 76.89, g/kg DM). It is inferred that in terms of UDP and amino acid contents, Leucaena leaf meal is better than that of cotton seed cake.