飼料 蛋白質의 反芻胃內 分解程度의 相互比較 = Comparison of Susceptibility to Degradation of Various Protein Sources in the Rumen of Cow

다국어 초록 (Multilingual Abstract)

In order to determine if classification or mutual comparison of feeds in respect of their susceptibility to degration of protein in the rumen can be made on the basis of the measurement of its degradability after incubation for 1, 3, 5, 8, 16 and 24 hours in the rumen by a nylon bag technque, disappearance of dry matter and crude protein from the bags were measured at the incubation times with 23 feeds using a fistulated cow given 2㎏ concentrate and 5㎏ rice straw per day. A method is proposed to estimate the effective protein degradation (EPD) as a function of the outflow rate and the defadation rate.
The rates of disappearance of dry matter of feeds tested in this study from the rumen were apparently lower than those of proteins, while there was a high positive correlation between dry matter disappearance and protein degradability, in rupin, raw soybeans and extruded soybeans wear as high as 0.9913, 0.9986 and 0.9946, respectively.
The order of the extend of degradation of protein among feeds varied considerably between incubation times.
The disappearance rate of from incubation times was especially high in wheat bran, lupin, raw soybeans, corn gluten feed, rapeseed meal and meat bone meal, and it was revealed that the protein degradability of corn gluten meal, sorghum, cottenseed meal, fish meal and feather meal were remarkabily lower than the others.
The ruminal crude protein degradabilities were reduced by extrution treatment of raw soybeans, and the protein degradabilities of extruded soybeans and untreated soybeans, and the protein degradabilities of extruded soybeans and untreated soybeans after 8 hours incubation were 37% and 68%, respectively.
The ruminal disappearance of soybean meal crude protein estimated by nylon bag technique were decreased significantly with 0.2% formaldeyde treatement per air dry matter, and the average protein degradabilities of 0.2% formaldehyde treated soybean meal and untreated soybean meal after total incubation times were 8.7% and 42.2% respectively.