SUPPLEMENTARY COPPER FOR GROWING CATTLE CONSUMING DIETS HIGH IN MOLYBDENUM OR MOLYBDENUM PLUS SULFUR
SUPPLEMENTARY COPPER FOR GROWING CATTLE CONSUMING DIETS HIGH IN MOLYBDENUM OR MOLYBDENUM PLUS SULFUR
复制标题
DOI：
10.4141/cjas88-130
复制
发表时间：
1988-12
影响因子：
1
通讯作者：
K. Wittenberg;R. Boila
中科院分区：
文献类型：
--
作者：
K. Wittenberg;R. Boila
本试验选用48头低铜肉牛进行为期105天的生长试验，比较4种不同的铜添加方法。添加玉米青贮-大麦精料，使其含有10 mg kg−1干物质（DM）Mo和1.3（低S）或3.7（高S）g kg−1总S。低硫和高硫日粮中的铜处理是：（1）不补充Cu（0 Cu）;（2）在全价饲料中添加10 mg kg−1 DM Cu，以CuSO 4·5 H2O的形式添加到浓缩物（CuSO 4）中;（3）在第0天口服20 g氧化铜针（CuON）;（4）在第0天注射Cu（ICu）。各铜处理组日增重差异不显著（P > 0.05），但硫酸铜和铜氮处理组的干物质采食量显著低于无铜和铜处理组（P < 0.05）。饲料效率（FE;添加CuSO_4（FE = 5.60）组的日增重比（P < 0.05）优于添加0 Cu（FE = 6.88）组，而添加CuON（FE = 6.04）和ICu（FE = 6.16）FE组的日增重比介于添加0 Cu和CuSO_4组之间。将日粮硫从1.3 mg kg-1 DM增加到3.7 mg kg-1 DM导致肝脏和血浆中Cu和Mo浓度降低（P < 0.01）。
Forty-eight Cu-depleted beef steers were used in a 105-d growing trial to compare four methods of Cu supplementation. Corn silage-barley concentrate diets were supplemented to contain 10 mg kg−1 dry matter (DM) Mo, and 1.3 (low S) or 3.7 (high S) g kg−1 total S. Copper treatments within low and high S diets were: (1) no supplemental Cu (0Cu); (2) a dietary supplement of 10 mg kg−1 DM Cu in the complete feed, added as CuSO4∙5H2O to the concentrate (CuSO4); (3) 20 g copper oxide needles (CuON) orally dosed on day 0; and (4) injectable Cu (ICu) on day 0. Although average daily gain was not different (P > 0.05) among Cu treatments, DM intake was lower (P < 0.05) with CuSO4 and CuON than with 0Cu or ICu. Feed efficiency (FE; feed:gain ratio) was better (P < 0.05) with CuSO4 (FE = 5.60) than 0Cu (FE = 6.88), while CuON (FE = 6.04) and ICu (FE = 6.16) FE were intermediate to 0Cu and CuSO4. Increasing dietary S from 1.3 to 3.7 mg kg−1 DM resulted in lower (P < 0.01) concentrations of Cu and Mo in liver and plasma...