Apgar G A, Kornegay E T
Department of Animal and Poultry Sciences, Virginia Polytechnic Institute and State University, Blacksburg 24061-0306, USA.
J Anim Sci. 1996 Jul;74(7):1594-600. doi: 10.2527/1996.7471594x.
Twenty-four crossbred barrows (average BW, 70.8 kg) were used to compare the digestibility of dry matter and the mineral absorption and retention by pigs fed two Cu sources. Dietary treatments were 1) basal (B) (16% CP corn-soybean meal-based diet, 36 mg/kg of Cu), 2) B + 200 mg/kg of Cu from CuSO4.5 H2O (CuSO4), and 3) B + 200 mg/kg of Cu from a copper lysine complex (CuLys). All diets contained equal lysine content and .05% chromic oxide for indirect determination of absorption. Two 7-d total collection periods were conducted. Pigs were fed 8% of metabolic BW (BW.75) divided into two equal feedings. Average daily gain tended to be higher for pigs fed CuLys than for pigs fed CuSO4 (P < .02). Dry matter digestibilities were similar (P > .10) among treatments. The absolute amount of Cu absorbed and retained was greater for pigs fed both Cu sources (P < .001) than for pigs fed the control diet. Iron and Zn intake and excretion and the percentage of Fe absorbed and retained were similar (P > .10) among treatment groups. Chromium intake and excretion in feces were not different (P > .10), with an average recovery of 93.8%. Indirect DM digestibility was similar to total collection values; however, mineral values were similar only after correction for Cr recovery. Pigs fed elevated Cu absorbed more Cu, with no difference between the two sources. Zinc and Fe absorption and retention were generally not affected (P > .10) by Cu addition or sources. The absorption and retention of Cu was similar for pigs fed growth-stimulative levels of Cu from CuSO4 or copper lysine complex.
选用24头杂交公猪（平均体重70.8千克）来比较饲喂两种铜源的猪对干物质的消化率以及矿物质的吸收和保留情况。日粮处理如下：1）基础日粮（B）（以玉米-豆粕为基础的16%粗蛋白日粮，铜含量为36毫克/千克），2）基础日粮+200毫克/千克来自五水硫酸铜（CuSO4）的铜，3）基础日粮+200毫克/千克来自赖氨酸铜络合物（CuLys）的铜。所有日粮的赖氨酸含量相同，并含有0.05%的氧化铬用于间接测定吸收情况。进行了两个为期7天的全收粪期。给猪饲喂代谢体重（BW.75）的8%，分两次等量投喂。饲喂赖氨酸铜的猪的平均日增重趋于高于饲喂硫酸铜的猪（P<0.02）。各处理间干物质消化率相似（P>0.10）。饲喂两种铜源的猪吸收和保留的铜的绝对量均高于饲喂对照日粮的猪（P<0.001）。各处理组间铁和锌的摄入量、排泄量以及铁的吸收和保留百分比相似（P>0.10）。铬的摄入量和粪便排泄量无差异（P>0.10），平均回收率为93.8%。间接干物质消化率与全收粪期测定值相似；然而，矿物质值仅在校正铬回收率后才相似。饲喂高铜日粮的猪吸收的铜更多，两种铜源之间无差异。添加铜或铜源一般不影响锌和铁的吸收和保留（P>0.10）。饲喂来自硫酸铜或赖氨酸铜络合物的促生长水平铜的猪对铜的吸收和保留相似。
