高铜对断奶仔猪生长性能及血清激素水平的影响

Effect of High Copper on Growth Performance and Serum Hormone Levels of Weanling Stress Piglets

选用60头28日龄±2日龄“长大定”三元杂交断奶仔猪,按体重和性别随机分成3组,每组20头。Ⅰ组(对照组)仔猪饲喂基础日粮;Ⅱ组仔猪在断奶后14d内饲喂基础日粮+250mg/kg铜(CuSO4.5H2O),然后再饲喂基础日粮;Ⅲ组仔猪饲喂基础日粮+250mg/kg铜(CuSO4.5H2O)。试验期为28d。所有实验猪均于断奶后0,7,14d和28d称重,计算采食量,观察断奶后腹泻情况。同时每组固定10头仔猪,于断奶后0,7,14d和28d,经前腔静脉采血,测定部分血清激素水平。结果表明,高铜日粮能显著提高断奶仔猪体重(AW)、平均日增重(ADG)和日采食量(ADFI),降低料重比(F/G)和断奶后腹泻率,显著提高断奶仔猪血清GHI、NS、T3和T4的水平。

Sixty “Landrace × Yorkshire × Ding” crossbred weanling piglets （28 d ± 2d of age） were randomly divided into 3 groups of 20 piglets each by weight and sex. The piglets in group Ⅰ were fed a basal diet for 28 d postweaned;the piglets in group Ⅱ were fed the diets plus 250 mg/kg copper （from CuSO4·5H2O） for 14 d postweaned, then fed a basal diet for additional 14 d;the piglets in group Ⅲ were fed the diet plus 250 mg/kg copper （from CuSO4 · 5H2O） for 28 d postweaned. Body weights and feed intakes were determined on 0,7,14,28 d postweaned, and diarrhea rates were evaluated. Blood samples in thirty （10 per group） of sixty piglets were taken from the anterior vena cava on 0,7,14,28 d postweaned for measuring serum hormone levels. The trial was conducted for 28 d. The results showed that high copper diets increased significantly absolute weigh （AW）,average daily gain（ADG）and average daily feed intake（ADFI） of weanling stress piglets; decreased the ratio of feed to gain （F/G） and diarrhea rates postweaned; enhanced serum GH, INS, T3, T4.