Abstract 236

Sampath,-KT; Sivaraman,-E

College of Veterinary and Animal Sciences, Mannuthy, Trichur-68065, India.

Indian-Journal-of-Animal-Nutrition. 1985, 2: 4, 141-148; 16 ref.

Five cakes, ground and sieved to particle size 2-3 mm, were placed in nylon bags in the rumens of adult crossbred cows fed for 50 days on rice straw and different concentrate mixtures. Disappearance of DM and protein in 3-24 h was from groundnut cake 25-80 and 28-44, from gingelly cake 48-92 and 68-95, from rubber seed cake 31-74 and 27-96 and from coconut cake 10-64 and 3-38%, respectively. The data for protein disappearance were used to estimate the constants a, b and c in the equation p = a + b (1-e-ct). Effective protein degradability (PD) of each cake was calculated as a + bc/(c + k), where k is the fractional rumen outflow rate. PD estimated at an outflow rate of 0.05/h was 66.8, 85.1, 68.6 and 19.1% for the respective cakes. Coconut cake was resistant to microbial degradation in the rumen and was a good source of bypass protein.