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셀레늄강화 버섯폐배지의 급여기간이 거세한우의 조직내 셀레늄축적에 미치는 영향
김완영,이기종,노환국,이장형,Kim, W.Y.,Lee, K.J.,Nho, W.G.,Lee, J.H. 국립한국농수산대학교 교육개발센터 2005 현장농업연구지 = Journal of practical agricultural resear Vol.7 No.1
This study was carried out to determine effects of the feeding length of spent mushroom composts from selenium-enriched mushroom (Se-SMC) on muscular selenium deposition in finishing Hanwoo steers. A total of 30 steers were allotted to an experiment with a 3 × 2 factorial arrangement. Treatments were 2 groups of with and without Se-SMC at three different feeding lengths (2, 4, and 6 months) by body weight (BW). And then dry matter intake, body weight gain, Se concentration and/or content in blood and/or muscle were investigated. Dry matter intake was not affected by feeding length and Se-SMC supplementation. As the feeding length was prolonged, initial and final BW was significantly lowered (p<0.01) with no Se-SMC effect. However, total BW gain was significantly increased (p<0.0001) with increasing feeding length with no effect of Se-SMC. Se-SMC supplementation significantly increased Se concentration in whole blood, but there was no effect on feeding length. Se contents in muscles, especially hind-leg, were significantly increased (p<0.05) as the feeding length was increased. However, there was no difference for Se content between four and six months feeding groups of Se-SMC and also hepatic Se content was not affected by feeding length. On the contrast, hepatic Se content for Se-SMC group within each feeding length was significantly increased (p<0.001) compared with no Se-SMC supplementation. In conclusion, our results suggested that optimum feeding length of Se-SMC as a strategy for the production of Se-fortified beef might be approximately 4 months.
셀레늄강화 버섯폐배지의 급여기간이 거세한우의 육질 및 도체특성에 미치는 영향
김완영,이기종,노환국,이장형,Kim, W.Y.,Lee, K.J.,Nho, W.G.,Lee, J.H. 국립한국농수산대학교 교육개발센터 2005 현장농업연구지 = Journal of practical agricultural resear Vol.7 No.1
This study was carried out to determine effects of the feeding length of spent mushroom composts from selenium-enriched mushroom (Se-SMC) on meat quality and carcass characteristics in finishing Hanwoo steers. A total of 20 steers were used in this trial with four treatments. Treatments included control (no Se-SMC), Se-SMC groups of three different feeding lengths (2, 4, and 6 months). After the completion for each feeding length, steers were slaughtered and then loin muscle (Longissimus dorsi) was sampled to evaluate meat quality characteristics. Chemical compositions of the loin, except for protein content, were not different across treatments. Protein content was highest in 6 months feeding groups, however, it was lowest in 4 months. Physical property and meat color (L*, a* and b* values) were not affected by the feeding length of Se-SMC. However, water holding capacity (WHC) for Se-SMC feeding treatments was significantly more improved (p<0.05) in comparison with the control group, showing 63.8 (2 months), 64.4 (4 months), 64.2 (6 months), and 59.5% (control), respectively. Grades for meat quality and quantity, and carcass characteristics were not affected by feeding length of Se-SMC. Our results showed that Se-SMC supplementation was not significantly associated with parameters for meat quality and carcass characteristics. However, as feeding Se-SMC lengthens, WHC for loin was more improved, suggesting that the improved WC may result in the expression of antioxidant effect.
반추가축에 있어서 옥수수 알곡의 가공이 영양소 이용에 미치는 영향에 관한 고찰
김완영,김홍욱,이기종,Kim, W.Y.,Kim, H.W.,Lee, K.J. 국립한국농수산대학교 교육개발센터 2001 현장농업연구지 = Journal of practical agricultural resear Vol.3 No.1
Through out the last few decades, processing methods for ingredients of feed grains, such as grinding, flaking, extrusion, soaking, cracking etc., have been adopted in order to improve the nutrient digestibility in ruminants. Among feed grains, processing methods for whole corns have been the most frequently studied since corns are utilized as the thumb ingredients in formulating feeds. In these days, flaking of whole corns is the most incessantly used in formulation feeds, resulting in enhancing the performance of ruminants. Recently formulating non-forage feed for beef cattle, especially Holsteins, without processing whole corns is carrying out through various feed companies with expectations of whole corns acting like forages. However, it can not be ruled out that whole corns might possibly result in decreasing the productivity due to the depression of nutrient utilizations. Therefore, one must reevaluate the non-forage feeds as well as makes an effort to develop the rational and effective methodology in processing whole corns with the consideration of rumen eco-system.
젖소에 대한 성장호르몬 ( rbST ) 투여가 유생산 , 유성분 및 호르몬 수준변화에 미치는 영향
이종문(J . M . Lee),최순호(S . H . Choi),김주호(J . H . Kim),임관열(G . Y . Lim),명규호(K . H . Myung),이기종(K . J . Lee) 한국축산학회 1991 한국축산학회지 Vol.33 No.12
Two experiments were conducted to evaluate the effect of recombinantly derived bovine somatotropin (rbST) on milk production, feed efficiency, milk composition and hormones in lactating dairy cows. In daily injection treatment, 15 Holstein cows were allocated to 3 treatments consisted of 0 ㎎/day, 12.5 ㎎/day and 25.0 ㎎/day. The injection of rbST was conducted intramuscularly once a day beginning at day 28 postpartum and continuing for 210 days. In a sustained release treatment, 12 Holstein cows were allocated to 3 treatments consisted of 0 ㎎/2 weeks, 500 ㎎/2 weeks and 750 ㎎/2 weeks of rbST (SR-rbST) injected subcutaneousely once at 2 week intervals beginning at day 254 postpartum and continuing for 28 days. Cows were fed concentrates containing 19.0% CP and 72.4% TDN, and corn silage (30 ㎏/day) throughout the experimental period. The rbST injection (25 ㎎/day) increased 4.0% FCM milk production by 18.0% during treatment period and by 11.7%, compairing with the milk yield of pretreatment period for control cows, while SR-rbST (750 ㎎/2 weeks) injection by 7.0% above control group. There are slightly decreased tendencies in body weight gain after rbST treatments. Milk fat, protein and lactose percentages were slightly highter in rbST treatment groups (12.5 ㎎/day and 25.0 ㎎/day) but did not show statistical difference. However, DM intake of concentrate was increased by 11.0%. showing the highest feed efficiency (㎏ 4.0% FCM/㎏ DM) in 25,0 ㎎/day treatment. Concentration of bST in serum was significantly (P$lt;0.05) higher in rbST treatments (23. 96 and 49.23 ng/㎖) than that of control (15.26 ng/㎖) but milk bST concentration did not differ among treatments (0.32, 0.35 and 0.36 ng/㎖). Furthermore, serum IGF-1 were increased by two-fold with two rbST injection groups (63.53 and 65.60 ng/㎖) although milk IGF-I concentrations were similar for all treatments. Therefore, it could be concluded that rbST and SR-rbST administrations to lactating Holstein cows efficiently improve dairy performances without altering milk composition in a whole and a late lactation period, respectively.
생효모 배양물이 젖소 비육우의 성장능력 및 육생산성에 미치는 효과
강우성(W . S . Kang),이상철(S . C . Lee),윤상기(S . K . Yoon),정의수(E . S . Chung),이기종(K . J . Lee) 한국축산학회 1992 한국축산학회지 Vol.34 No.2
The effect of live yeast culture in diets of Holstein dairy bulls was examined in feeding and digestibility trials. Twenty heads weighing about 120㎏ were allocated to control, 0.25% live yeast culture, 0.1% probiotics A and 0.15% probiotics B complex(probiotics+enzyme+yeast culture). In growing period, daily gain was not significantly affected by treatments, but DM intake per ㎏ wt. gain was highest (P$lt;0.05) in live yeast culture group among treatments. For both daily gain and nutrient (DM, CP, TDN) intake per ㎏ wt. gain, live yeast culture group was higher (P$lt;0.05) than control for fattening Ⅰ period, and also was higher (P$lt;0.05) than control and probiotics A group for fattening Ⅱ period. Difference between probiotics A and probiotics B complex was not significant in growth performance for each period. Live yeast culture appeared to shorten the day required to marketing weight compared to other additives. Carcass characteristics except kidney fat were not different among treatments. Profit and net income were improved by 5% and 15% with the inclusion of live yeast culture, respectively. CO₂ and H₂S production through feces were remarkably (P$lt;0.05) affected by the additives. Slight increases in digestibility were observed by the additives for DM, CP and CF.