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면양에 있어서 옥수수의 입자도가 사료의 반추위내 통과속도 , 단백질과 건물의 분해 및 소화율에 미치는 영향
문태현,육종륭,하종규,한인규 ( Tae H . Moon,Jong Y . Yuk,Jong K . Ha,In K . Han ) 한국축산학회 1986 한국축산학회지 Vol.28 No.11
The effect of different particle sizes of corn on the rate of outflow, degradations of dietary protein and dry matter, and digestibility in sheep was studied, Six adult sheep weighing about 50㎏ were used. The animals were fitted with rumen canula and individually maintained in metabolism cages. All the animals were fed, at a maintenance level, a basal diet of 70% concentrates and 30% rice-straw pellets twice daily at approximately 12-hour intervals and had free access to water. Two different particle sizes of corn (1. 68-2. 38㎜ and 0. 8411.19㎜) were labelled with sodium dichromate and a 50g of the mordanted corn was introduced as a single dose via rumen canula. The rate constants (k) and retention time were calculated. Nylon bag techniques were conducted to measure degradations of protein and dry matter of the particles, and digestion coefficients were measured using the total collection method. The results obtained are summarized as follows: The stability of the corn mordanted with sodium dichromate as an indicator was inconclusive bemuse of the various DM losses (3.32% to 8.54%) according to the particle and incubation conditions. The rate of outflow (k) of the small particles (0.0359h^(-1)) was higher than that of the large particles (0.0251h^(-1)) and retention time was shorter for the small particles (27.8 hrs) than that for the large particles (44.6 hrs). When both small and large particles were incubated at 0,3,6,12,24,36 and 48 hours, DM disappearance of the small particles at 0,3,6 and 48 hours was higher, showing 8.4, 13.5, 16.0 and 64.0?%, respectively, than those of the large particles, 5.8, 9.6, 11.7 and 54.2%, respectively. No significant differences were observed at the other incubation times. There was no significant difference in protein disappearance between the small and large particles, but at 0 time incubation, the protein disappearance of the small particles (13.4%) was significantly higher than that of the large particles (7.6%). Digestion coefficients and ruminal pH were not affected by the different particle sizes.
반추가축의(反芻家畜) 사료섭취량 조절과 반추에(反芻) 관한 문헌적 고찰
배동호,육종륭 한국낙농학회 1981 韓國酪農學會誌 Vol.3 No.2
The subject is reviewed with respect to the regulatory of feed intake in the ruminants. The importance of physical and physiological or metabolic regulatory mechanisms are discussed in relation to their effects upon the formation of various metabolites known to be rebated to feeding. Also, reviewed the role of rumination as a physical regulatory mechanisms.
거세우에 있어서 사료단백질의 종류가 미생물체 단백질합성 , 단백질의 분해도 및 사료의 소화율에 미치는 영향
하종규,육종륭 ( J . K . Ha,C . Y . Yuk,J . J . Kennelly,R . Berzins ) 한국축산학회 1985 한국축산학회지 Vol.27 No.12
Effects of dietary nitrogen source on microbial protein synthesis, dietary protein degradation and nutrient digestion were examined with cannulated mature Holstein steers. Animals were fed 40% hay and 60% concentrate mixtures containing urea, soybean meal (SBM), canola meal (CM) and dehydrated alfalfa (Dehy) as a supplementary protein source. Nitrogen source in the diets did not alter duodenal or ileal flow rates of dry matter (DM) or organic matter (OM). Partial digestibility of DM and OM prior to the duodenum and in the small intestine, and total digestibility in the whole digestive tract were similar across all dietary treatments. Steers fed SBM and Dehy had higher (P$lt;0.05) concentration of total nitrogen and non-ammonia nitxogen in duodenal digesta than those fed urea and CM. Dehy-fed steers had lower (P$lt;0.05) concentration of microbial nitrogen than other groups. A tendency for higher flow of total nitrogen and lower flow of microbial nitrogen and therefore, lower ratio of microbial to non-ammonia nitrogen was observed with decreasing protein degradabilities of the diets containing the natural protein sources. The degradabilities of dietary protein, in vivo, were 66.3, 57.9, 63.3 and 41.0% for urea, SBM, CM and Dehy supplemented diets, respectively.