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구리 공급원과 첨가수준이 이유자돈의 생산성에 미치는 영향
김윤기(Y . K . Kim),백인기(I . K . Paik),권관(K . Kwon) 한국축산학회 1991 한국축산학회지 Vol.33 No.11
An experiment was conducted to study the effects of different sources and levels of copper on the performance of weanling pigs. For a 6-wk feeding trial, 128 3-way crossbred weanling pigs(BW 11-13.5kg) were randomly distributed into 16 groups of 8 heads(4 male and 4 female) each. Four groups were allotted on one of the following 4 dietary treatments: non-supplemented diet(control), diet supplemented with 200ppm of Cu from CuSO₄·H₂O(CuSO₄-200). diet supplemented with 63.5ppm of Cu from sequestered mineral copper (SQM-Cu-63.5) and SQM-Cu-127. Results showed that weight gain and feed efficiency for the first 2 wks were sign significantly(p$lt;0.05) greater in CuSO₄-200 and SQM-Cu-63.5 groups than in control groups. Six wk average of weight gain and feed efficiency were not significantly different among treatments although SQM-Cu-127 showed the highest and the control showed the lowest performance. Moisture content of feces tended to be high in CuSO₄-200 groups. Copper content in feces significantly(p$lt;0.01) increased as the level of copper in the diet increased. Fecal color of Cu supplemented groups were appreciably different from that of control.
김윤기(Y . K . Kim),백인기(I . K . Paik) 한국축산학회 1993 한국축산학회지 Vol.35 No.1
An experiment was conducted to study the effects of sources and levels of copper on the performance of broiler chicks. For a 6 wk floor feeding trial, 1,000 hatched broilers of Starbro strain were randomly distributed into 20 pens of 50 birds (25 males and 25 females) each. Four pens were allotted to each of the following 5 dietary treatments; non-supplemented diet (control), diet supplemented with 200 ppm of Cu from CuSO₄· H₂O (CuSO₄-200), diet supplemented with 63.5 ppm of Cu from sequestered mineral copper (SQM-63.5), SQM-127 and SQM-190.5. Results showed that cumulative weight gain at 4 wk of age were significantly (p$lt;0.05) greater in SQM supplemented groups than the control and CuSO₄-200 groups. Feed intake of CuSO₄-200 group was significantly (p$lt;0.05) smaller than other groups. Fecd/gain was significantly (p$lt;0.01) greater in the control than in CuSO₄-200, SQM-63.5 and SQM-127 groups. Overall weight gain and feed efficiency at 6 wk of age were significantly (p$lt;0.01) improved in the copper supplemented groups than the control group. The best results were shown in SQM-190.5 and CuSO₄-200 groups for growth, and SQM-127 and CuSO₄-200 groups for feed efficiency. Mortality was not significantly affected by treatments. Concentrations of copper in liver (p$lt;0.05) and feces (p$lt;0.01) increased significantly as the level of dietary copper increased but those in kidney were not significantly affected. Gizzard erosion index increased as the level of Cu increased. The pH of the contents in cecum tended to be lower in chicks fed Cu supplemented diets than those fed the control. The population of coliforms bacteria was not affected by treatments, but that of lactobacillus spp. in cecum tended to increase and streptococcus spp. in gizzard and cecum to decrease in the copper supplemented groups.