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여러가지 In vitro 방법의 소화율과 In vivo 소화율과의 비교연구
백봉현(B . H . Paek),정연후(Y . H . Chung) 한국축산학회 1988 한국축산학회지 Vol.30 No.3
For the estimation of digestibility of roughage, various methods of in vitro and chemical fractionation of cell wall were tested. The estimated digestibility on the basis of 20 roughages was compared with the known in vivo digestibility. The following methods were compared; two way in vitro digestibility (Tilly & Terry), gas production (Hohenheimer Futterwerttest (HFT)$gt; Menke), nylon-bag digestibility (Kaufmann) and determination of cell wall components (Van Soest). The results are summarized as follows: 1. The estimated digestibility by methods showed highly significant correlation with in vivo digestibility (P$lt;0.01). The high potential for the estimating in vivo digestibility was observed on the digestibility of two way in vitro (r=0.95) and HFT (r=0.93). The correlation coefficients (r) between digestibility of an vivo and cell wall component and nylon-bag were 0.88 and 0.84, respectively. 2. Within the subgroup of grass/alfalfa, correlation coefficient was increased with the exception of nylon-bag method. 3. Within corn silage and mixture of corn silage and concentrate, correlation coefficient was increased for the method of nylon-bag and cell wall component, while decreased for two way in vitro and HFT methods.
가스 발생량을 이용한 In - vitro ( HF - Test ) 소화율 검정방법에 관한 연구
백봉현 ( B . H . Paek ) 한국축산학회 1987 한국축산학회지 Vol.29 No.1
This experiment was conducted in order to compare the in-vitro (Hohenheimer Futterwert Test: HFT) method which measures gas produced when nutrients in feeds are catabolized by artificial rumen juice, with in-vivo method. The OM digestibility, DE and ME were determined using 22 feed samples. The results obtained were as follows; 1. In vivo OM digestibility and gas production by HFT was highly correlated (r=0.88), and same trend was also noted between in vivo OM digestibility and OM digestibility by HFT (r=0.92). 2. The correlation coefficient between DE of NRC and HFT was relatively low (r=0.83), while the correlation coefficient between ME of MAFF/NRC and HFT was high (r=0.93).
한우 육성 및 비육기 영양수준이 발육 , 사료이용성 및 도체 조성에 미치는 영향
김강식(K . S . Kim),신기준(K . J . Shin),백봉현(B . H . Paek),김용곤(Y . G . Kim),이근상(G . S . Lee),권순기(S . K . Kwon) 한국축산학회 1987 한국축산학회지 Vol.29 No.4
To evaluate the effect of feeding level on daily gain, feed efficiency and carcass composition, high (H: DCP and TDN was supplied for 1.1㎏ daily gain × 1.1) and low (L: DCP and TDN was supplied for 0.6㎏ daily gain × 1.1) level nutrient were fed to each 12 heads of Korean native bulls (KNB) for the 1st period (body weight from about 120㎏ to 300㎏), and thereafter during 2nd period 12 heads were devided into two groups and fed with H and L-feeding level until animals weighted about 500㎏. 1. Daily gain was significantly increased (P$lt;0.05) and the feeding period was significantly decreased when fed with H level. Shifting feeding level (H→L or L→H) did not affect the daily gain during whole period although there was a trend that H level during 1st period was more efficient than L level. 2. Dry matter intake was higher with H level than with L level. 3. DCP efficiency was better when fed with L level. The efficiency of L→H level was lower than that of H→L level during whole period but was better than that of H→H level during the early phase of 2nd period. 4. TDN efficiency was not influenced by the feeding level. However, TDN efficiency of H group was slightly better than that of L group during the 1st period. 5. Dressing percentage was significantly increased when fed with H level during the 2nd period. Fat content was significantly increased when fed with H→H level, while there was no significant differences among H→L, L→H, L→L feeding levels. There was no significant differences in retailed cuts between the feeding levels. 6. Carcass price was higher and feed cost was lower when fed with L level during the 2nd period. The monthly income per head was higher when fed with H level during the 1st period, although there was no big differences between H→H and L→H feeding level.
한우의 비육기간중 암모니아처리 볏짚 급여시 배합사료급여수준이 일당증체 사료섭취량 및 사료효율에 미치는 영향
신기준(K . J . Shin),이근상(G . S . Lee),백봉현(B . H . Paek),김강식(K . S . Kim) 한국축산학회 1988 한국축산학회지 Vol.30 No.5
The study was carried out to evaluate the effect of feeding anhydrous ammonia treated rice straw (NH₃-RS) with two different levels of concentrate on daily gain, feed consumption and feed efficiency. Rice straw (RS) was treated with 30g NH₃/㎏ RS dry matter (DM). Fifteen heads of Korean native bulls were allotted to three groups (five animals/group) and fed the following diets: (1) RS+concentrate 2.0% (% of live body weight), (2) NH₃-RS + concentrate 1.5%, (3) NH₃-RS + concentrate 2.0% for 160 days, and RS and NH₃-RS were fed ad libitum. 1. There were no significant differences in daily gain among the bulls fed with RS + concentrate 2.0%, NH₃-AS + concentrate 1.5% and NH₃-RS + concentrate 2.0%. But bulls fed with NH₃-RS + concentrate 2.0% showed apparently increasing trends of daily gain compared with RS + concentrate 2.0% and NH₃-RS + concentrate 1.5% decreased slightly compared with NH₃-RS + concentrate 2.0%. 2. Rice straw consumption was significantly increased by anhydrous ammonia treatment but NH₃-RS consumption was not influenced by different concentrate level. 3. Concentrate was less required for unit body weight gain while rice straw was more required by feeding NH₃-RS.