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완충지수곡선에 의해 평가된 옥수수 사일리지의 발효품질과 사료가치와의 관계
전병태,김경훈,문상호 ( B . T . Jeon,K . H . Kim,S . H . Moon ) 한국축산학회 1997 한국축산학회지 Vol.39 No.2
The present study was conducted to investigate the relationship between the feed value and fermentation quality of silage evaluated by the rapid titration method. The buffer index value was determined from the amount of 0.1N NaOH consumed in titration of each 0.5 pH step. Thirty four samples of com silage which had been collected from farms were assessed by deriving the buffer index curve. The silages were also analysed by the routine chemical methods for organic acids, dry matter, crude protein, crude fiber and ammonia-nitrogen. Degradability of silage dry matter was measured by incubating samples in nylon bags suspended in the rumen. Duplicated bags were removed at 12 and 24h postincubation. Each of fourteen silages had a same peak position at pH 4.0 on index curve (B type) and showed the characteristics of lactic acid fermentation. Twenty silages with a same position peak at pH 4.5 (C type) were moderately well preserved. The B type silages were higher in dry matter content and lower in crude protein and crude fiber contents compared to the C type silages. It should be noted that the B type silages were ensiled at more profitable maturation stage than the C type silages. Fourteen silages which had been selected randomly were deteriorated in aerobic phase to obtain the spoiled silages. By the results of titrating those extract juice, all of the silages had the same peak positions at pH 5.0 on each buffer index curve (D type) and showed significantly (P$lt;0.001) lower dry matter degarability than the B and C types. The results indicate that feed values of silage can be predicted by the rapid titration method.
수수 × 수단그라스 교잡종과 두과사료작물의 간작재배방식과 질소시비수준이 반추류의 기호성에 미치는 영향
전병태 ( B T Jeon ),이상무 ( S M Lee ),김경훈 ( K H Kim ),김창원 ( C W Kim ) 한국축산학회 1994 한국축산학회지 Vol.36 No.3
The effects of intercropping methods of sorghum × sudangrass hybrid (Sorghum bicolor (L.) Moench) with legume crops and different nitrogen fertilization levels on the palatability were examined in sika deer in comparison to Holstein cows and Korean native cattle. Intencropping with soybeans (Glycine max (L.) Nterr.) showed a high relative palatability(RP) in all ruminants, especially increasing by 30% in sika deer. However, for intercropping with cowpeas (Vigna sinensis Endl.), the RP was decreased by 40% in sika deer and by more than 80% in Holstein cows and Korean native cattle. The level of nitrogen(0, 30, 60, 90, 120, and 150 ㎏/㏊) had a significant effect on the RP of sika deer. The nitrogen levels of 30 and 60 ㎏/㏊ improved the RP by 60 and 40 %, respectively, while those of 120 and 150 ㎏/㏊ depressed the RP by 40 and 60%, respectively. For Holsteins, nitrogen levels of 120 and 150 ㎏/㏊ decreased the RP but little change was observed at nitrogen levels of 0 ㎏ to 90 ㎏/㏊. For Korean native cattle, nitrogen levels did not show any significant effect on the RP.
호맥건초의 생육단계와 절단이 산양의 채식 및 반추행동에 미치는 영향
문상호 ( S H Moon ),전병태 ( B T Jeon ),광전수헌 ( H Hirota ) 한국축산학회 1995 한국축산학회지 Vol.37 No.2
To determine feeding behavior in relation to quality and physical form of feed, this experiment was cunducted by feeding trials to evaluate eating and rumination behavior in goats fed a rye hay in a unchopped or chopped form harvested at two stages of maturity. Rye hay dried at two different stages of growth for experimental rations was offered ad libitum in the unchopped or 2cm long chopped form to twelve goats. Although there were no significant differences (P$gt;0.05), eating time was longer in the chopped form than in the unchopped form at harvested both growth stages, but times for the different growth stages were hardly different. Rumination time was longer in the group fed unchopped hay harvested at the boot stage and in the group fed chopped hay harvested at the heading stage, however, the differences were not significant (P$gt;0.05). Resting time was in contrast to rumination time. Goats in all groups exhibited the similar behavioral patterns, showing longer periods of eating from 12:00 to 19:00 and the most vigorous rumination after 19:00. However, the periods of rumination in groups fed hay harvested at the heading stage were greater than in groups fed hay harvested at the boot stage. Unitary time of eating per 100g or 100KJ of ingested nutrients was longer in groups fed chopped hay than in groups fed unchopped hay harvested at both growth stages, but there were no significant differences (P$gt;0.05) except for crude protein (P$lt;0.05). Unitary time of rumination per 100g or 100KJ of ingested nutrient was all long in the group fed unchopped hay harvested at the boot stage (P$gt;0.05) but was little different at heading stage. Unitary rumination time was significantly longer (P$lt;0.05) in groups fed hay harvested at the heading stage than in groups fed hay harvested at the boot stage. Number of chews was more numerous in groups fed unchopped hay than in groups fed chopped hay harvested at both stages and that was also greater at the heading stage than at the booting stage, although there were no significant differences (P$gt;0.05). As time past, number of chews per bolus tended to decrease in groups fed hay harvested at the boot stage but tended to increase in groups fed hay harvested at the heading stage. The result of chewing time per bolus was similar to that of number of chews. Chewing speed obtained by dividing the number of chews by chewing time was faster in groups fed unchopped hay than in groups fed chopped hay during the whole period and was faster in groups fed hay harvested at the heading stage than in groups fed hay harvested at the boot stage. Chewing speed was also the fastest during the period of 11:00-17:00 and tended to decrease therefore in all groups. Consequently, it is considered that feeding behavior is largely influenced by quality, chopping and intake of roughage.
완충지수곡선을 이용한 옥수수 사일리지 발효품질의 간역적 (簡易的) 평가
김경훈(K . H . Kim),전병태(B . T . Jeon),정찬(C . Chung) 한국축산학회 1992 한국축산학회지 Vol.34 No.6
This study was conducted to demonstrate the practical use of the buffer index curve as a criterion of quality evaluation of Maize silage. Twenty samples of the ensiled Maize silage were collected from twenty farms in Kyonggi province. Silages were devided into 4 types by the pattern of buffer index curve. Heavy wilting silages (A type) showed no peak on buffer index curve and low organic acids and high pH values, which are characteristics of wilted silage. B type had a peak at pH 4.0 showed a high lactic acid content and a low pH value. Both of A and B types were regarded as a good quality silage. Silages with a peak at pH 4.5 (C type) were medium quality with lactic acid of 4.5% and volatile fatty acid (VFA) of 2.4%. Poorly preserved silages (D type) had a peak at pH 5.0 and showed high ratio of VFA to lactic acid content.
꽃사슴에 있어서 소화율 및 소화관내 통과속도의 계절간 차이
김경훈 ( K H Kim ),신향재 ( H J Shin ),이상무 ( S M Lee ),전병태 ( B T Jeon ),김창원 ( C W Kim ) 한국축산학회 1995 한국축산학회지 Vol.37 No.4
These experiments were conducted to determine the seasonal changes in digestive function and the passage rate by density in sika deer. The seasonal feed digestibility and passage rates of digesta through gastrointestinal tract in sika deer were estimated by using chromium-mordanted NDF. The recoveries in feses of plastic particles (PP) with four gravities (0.91, 1.20, 1.55, 2.10g/㎖) were also measured. Digestibilities of dry matter, organic matter, crude protein and neutral detergent fiber in summer showed silghtly higher value than those in winter, but these differences were not significant (P$gt;0.05). Excretion pattern in feces of Cr-mordanted fiber did not differ between winter and summer. The recovery rate of PP also did not show differences between winter and summer but was depended critically on gravity. The PP of 0.90g/㎖ passed about less 6% through the gastrointestinal tract of all deer. In the gravity range 1.20 and 1.55, gravity was less important in controlling passage rate. And PP above 2.10g/㎖ had a high recovery rate of 75%. With increasing gravity of PP, the ruminated rates were decreased and the passing out of the orifice was more easily.