本试验旨在探讨20~35 kg杜泊×小尾寒羊F1代杂交公羔羊钙、钠、钾、镁生长需要量。采用比较屠宰试验,分别在羔羊体重20、28和35 kg时屠宰,测定动物体组织器官的钙、钠、钾、镁含量,建立数学模型对体内矿物质含量变化规律及需要量进行预测。结果显示,羔羊在20~35 kg体重阶段,肌肉生长速度较稳定,骨骼生长速度逐渐减慢,而体内脂肪组织在迅速增加;羔羊体内矿物质含量与空腹体重(EBW)具有高度相关性(R2=0.84~0.98),钙、钠、钾、镁净生长需要量(NRG)预测公式分别为NRGCa=15.26EBW-0.171,NRGNa=1.67EBW-0.085,NRGK=1.94EBW0.023和NRGMg=0.34EBW0.051。由此可计算得出,杜泊×小尾寒羊F1代羔羊在20~35 kg阶段,以空腹体增重(EBG)表示,机体钙、钠、钾、镁的NRG分别为8.56~9.36 g/kg EBG、1.15~1.20 g/kg EBG、2.07~2.09 g/kg EBG和0.39~0.40 g/kg EBG;以体增重(BWG)表示,分别为7.18~8.18 g/kg BWG、0.96~1.05 g/kg BWG、1.76~1.81 g/kg BWG和0.34 g/kg BWG。
This experiment was conducted to investigate the growth requirements of calcium, natrium, kalium and magnesium for Dorper×Thin-tailed Han crossbred lamb (F1) at 20 to 35 kg. A comparative slaughter trial was used and the lambs were slaughtered at 20, 28 and 35 kg; the contents of calcium, natrium, kalium and magnesium in tissues and organs were determined and mathematical models for predicting mineral requirements were established. The results showed that at the body weight of lambs from 20 to 35 kg, the growth rate of muscle, bone and body fat tissues maintained stable, decreased and increased, respectively, Body mineral contents were highly correlated with empty body weight (EBW) (R2=0.84 to 0.98), and the equations for predicting net growth requirement (NRG) of minerals were: NRGCa=15.26?EBW-0.171, NRGNa=1.67?EBW-0.085, NRGK=1.94?EBW0.023 and NRGMg=0.34?EBW0.051. It is calculated that the Dorper×Thin-tailed Han crossbred lamb (F1) at 20 to 35 kg, the NRG of calcium, natrium, kalium and magnesium expressed as empty body weight gain (EBG) were 8.56 to 9.36 g/kg EBG, 1.15 to 1.20 g/kg EBG, 2.07 to 2.09 g/kg EBG and 0.39 to 0.40 g/kg EBG, and expressed as body weight gain (BWG) were 7.18 to 8.18 g/kg BWG, 0.96 to 1.05 g/kg BWG, 1.76 to 1.81 g/kg BWG and 0.34 g/kg BWG.
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