EFFECTS OF SOURCE AND LEVEL OF COPPER ON PERFORMANCE AND LIVER COPPER STORES IN WEANLING PIGS
EFFECTS OF SOURCE AND LEVEL OF COPPER ON PERFORMANCE AND LIVER COPPER STORES IN WEANLING PIGS
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DOI：
10.2527/jas1989.67112996x
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发表时间：
1989-11-01
影响因子：
3.3
通讯作者：
MONEGUE, HJ
中科院分区：
文献类型：
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作者：
CROMWELL, GL;STAHLY, TS;MONEGUE, HJ
五个28- 33-d的实验涉及460头28 ±-断奶的杂交猪。本试验以2日龄断奶仔猪为试验对象，研究了饲粮中添加高水平硫酸铜（CuSO_4）和氧化铜（CuO）对断奶仔猪增重率、增重效率和肝脏铜贮量的影响。将猪以每组5 - 6头/栏的方式饲养，并饲喂强化的、未加药的玉米-豆粕-干乳清基础日粮（1.1%赖氨酸，30 ppm Cu）。在Exp.试验1和2中，猪（8个重复）分别饲喂基础日粮或基础日粮加125或250 ppm铜（CuSO 4或CuO）28 h。在Exp. 3和4中，四个重复饲喂与实验中相同的饲料。1和2加上两种额外的饮食（来自CuSO 4或CuO的500 ppm Cu）。在Exp. 5，饲料中0，125，250，375或500 ppm的铜从CuSO 4的水平进行了评估，使用四个重复。在每个实验结束时，从每个围栏中的一头猪收集肝脏用于Cu分析。总的来说，通过以CuSO_4形式饲喂125或250 ppm的Cu，增重率和效率得到改善（P <0.01），其中125 ppm的日粮水平在刺激生长方面的有效性为250 ppm的75%左右。猪的性能没有什么不同，从控制时，最高（500 ppm）水平的铜（从CuSO 4）喂养。肝铜增加10至70倍时，250至550 ppm的铜从CuSO 4被列入饲料。停饲500 ppm铜28 d后，肝铜含量从DM的1,513 ppm降至274 ppm。所有的饮食水平的氧化铜未能影响生产性能或肝脏铜水平，这表明氧化铜中的铜在很大程度上是不可用的，无效的生长促进剂断奶仔猪。
Five 28- to 33-d experiments involving 460 crossbred pigs weaned at 28 .+-. 2 d of age (initial weight, 6.7 to 8.1 kg) were conducted to determine the effects of feeding high dietary levels of Cu sulfate (CuSO4) or Cu oxide (CuO) on rate and efficiency of gain and liver Cu stores of weanling pigs. The pigs were housed in groups of five to six/pen and fed a fortified, unmedicated, corn-soybean meal-dreid whey basal diet (1.1% lysine, 30 ppm Cu). In Exp. 1 and 2, pigs (eight replicates) were fed the basal or the basal plus 125 or 250 ppm Cu from CuSO4 or CuO for 28 h. In Exp. 3 and 4, four replications were fed the same diets as in Exp. 1 and 2 plus two additional diets (500 ppm Cu from CuSO4 or CuO). In Exp. 5, dietary levels of 0, 125, 250, 375 or 500 ppm Cu from CuSO4 were evaluated using four replications. At the end of each experiment, the liver from one pig in each pen was collected for Cu analysis. Overall, rate and efficiency of gain were improved (P < .01) by feeding 125 or 250 ppm Cu as CuSO4, with the 125 ppm dietary level being about 75% as effective in stimulating growth as 250 ppm. Performance of pigs was not different from controls when the highest (500 ppm) level of Cu (from CuSO4) was fed. Liver Cu increased 10- to 70-fold when 250 to 550 ppm Cu from CuSO4 was included in the feed. Withdrawal of 500 ppm dietary Cu for 28 d decreased in liver Cu from 1,513 to 274 ppm of DM. All dietary levels of CuO failed to influence performance or liver Cu levels, suggesting that the Cu in CuO was largely unavailable and ineffective as a growth promotant for weanling pigs.