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Effect of Dietary Copper Supplementation on Nutrient Digestibility, Growth Performance, Rumen Parameters and Copper Metabolism in Finishing Meat Goats
Anh, Nguyen Nhat
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Zervas, G., E. Nikolaou and A. Mantzios. 1990. Comparative study of chronic copper poisoning in lambs and young goats. Anim. Prod. 50:497-506.|
|摘要:||將8頭肥育肉羊(平均年齡1.5歲)個別置入個飼籠內並逢機分配至4種飼糧處理組。4種處理飼糧其每公斤乾物質分別含(1) 0 mg、(2) 5 mg、(3) 25 mg及(4)50 mg 由水合鹼式碳酸銅(Cu2(OH)2CO3)又名孔雀石提供之銅。將該碳酸銅依各處理比例溶於氨水並噴灑於商業精料後保存於4℃。本試驗所用之基礎飼糧含50%精料（17.5 ± 1.75 mg Cu/kg DM）與50%盤固乾草（7.62 ± 0.78 mg Cu/kg DM）。結果顯示受試羊之平均日增重及飼料效率於各處理組間無顯著差異。所有受試羊之總平均ADF消化率於第16及第23日顯著高於第9日者（P = 0.0396）。所有受試羊之總平均粗脂肪消化率於第23日最高，第9日者最低（P = 0.0108）。第2處理組羊隻其瘤胃液滲透壓最高，第4處理組者最低（P = 0.0204）。瘤胃內微生物、原蟲數量及pH值於各組間無顯著差異。總揮發性脂肪酸濃度隨著銅添加量之增加而減少（P = 0.0051），但第1處理組及第2處理組間無顯著差異。第3處理組瘤胃內丙酸濃度最高，第4處理組者最低（P = 0.0325）。瘤胃內及糞便內銅濃度隨著飼糧內銅濃度增加而升高（P = 0.0001）。尿銅濃度隨飼糧銅濃度增加而升高之趨勢（P = 0.0537）。全血及血漿中銅濃度於各組間無顯著差異，第4處理組之全血鐵濃度最高，第1處理組者最低。糞便內及瘤胃內鉬及硫濃度與飼糧內鉬及硫含量成正相關。結論，於肥育肉羊飼糧內添加銅對其生長性狀及銅之營養狀態無影響，但會提升動物血液內鐵濃度及降低對銅與鉬之吸收。於飼糧添加銅對肥育肉羊之生長性狀影響甚微，影響僅限
Eight finishing female goats of Nubian crossbred with Taiwan Black (32.7 3.25 kg of body weight) were used to determine the effect of copper supplementation on nutrient digestibility, growth performance, rumen parameters and copper metabolism. Goats were located in individual pens and randomly assigned to four dietary treatments by a completely randomized design. The treatments consisted of basal diet containing (1) 0 mg, (2) 5 mg, (3) 25 mg and (4) 50 mg of copper supplemented/kg DM with copper (II) carbonate dihydroxide (Cu2(OH)2CO3). The copper chemical was dissolved in ammonia water and sprayed on concentrate to make its copper content doubled of being required and kept at 4oC. Basal diet was consisted of 50% concentrate (17.5 1.75 mg Cu/kg DM) and 50% pangola hay (7.62 0.78 mg Cu/kg DM). The results revealed that average daily gain and feed efficiency were not different among the treatments. The digestibilities of ADF varied among the duration days such that measurements on day 16 and day 23 were higher (P < 0.04) than those on the day 9 but not differed from those on day 2. Crude fat digestibility was the highest on the day 23 and lowest (P = 0.0108) on the day 9. Ruminal osmolarity was the highest in goats fed diet 2 and the lowest (P = 0.0204) in goats fed diet 4. Ruminal bacteria and protozoa population as well as pH were not different among the treatments. Content of total rumen volatile fatty acids were decreased (P < 0.01) as copper supplementation increased but no difference was observed between goats fed diet 1 and diet 2. Ruminal propionate content was the highest and the lowest (P = 0.0325) in goats fed with diet 3 and diet 4, respectively. Ruminal fluid and fecal copper concentration increased (P < 0.001) when dietary copper supplementation increased. Copper content in urine tended (P = 0.0537) to increase as dietary copper concentration increased. Copper contents in whole blood and plasma were not different among the treatments whereas iron content in whole blood in the goats fed diet 4 and diet 1 was the highest and the lowest, respectively. Fecal contents of molybdenum and sulfur positively correlated with whereas rumen fluid contents of these elements negatively correlated with the dietary copper supplementation levels. In conclusion, current range of dietary copper supplementation exerts no effect on the growth performance and copper status but increases the blood iron concentration and reduces the absorbabilities of molybdenum and sulfur by animals. Dietary copper supplementation exerts little, if any, effect on nutrient digestibility and ruminal parameters in finishing meat goats.
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