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Ruminant Nutrition and Forage Utilization
Asian-Australasian Journal of Animal Sciences 1997;10(2): 210-214.
DOI: https://doi.org/10.5713/ajas.1997.210    Published online April 1, 1997.
Estimation of ruminal degradation and intestinal availability of crude protein in the animal-origin feedstuffs using mobile nylon bag technique
S. C. Lee, Y. H. Moon
Runimal degradation characteristics and intestinal availability of crude protein (CP) in four animal-origin feeds (fish meal, meat meal, viscera meal, feather meal) were estimated by mobile nylon bag technique. Three ruminally and duodenally cannulated Holstein dairy cows (average body wt. 550kg) fed a diet containing 40% concentrate and 60% orchard grass hay on a dry matter (DM) basis. Assuming that the outflow rate of diet in rumen is 5% per hour (k =0.05), contents of quickly degradable CP (QDP), slowly degradable CP (SDP), and undegradable CP (UDP) in the rumen were 27.6%, 9.4%, 63.0% for fish meal, 34.3% 28.1%, 37,6% for meat meal, 43.9%, 12.5%, 43.6% for viscera meal, and 14.4%, 15.8%, 69.8% for feather meal, respectively. Intestinal CP degradability was 51.0% for fish meal, 27.2% for meat meal, 37.9% for viscera meal and 56.2% for feather meal. Available UDP in the intestinal tract was contained 288 g, 217 g, 246 g and 423 g per kilogram DM of diet in fish meal, meat meal, viscera meal and feather meal, respectively.
Keywords: Fish Meal; Meat Meal; Viscera Meal; Feather Meal; Mobile Nylon Bag; Undegradable Crude Protein

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